The send_dg function in resolv/res_send.c in GNU C Library (aka glibc or libc6) before 2.20 does not properly reuse file descriptors, which allows remote attackers to send DNS queries to unintended locations via a large number of requests that trigger a call to the getaddrinfo function.

According to the versions of the glibc packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - It was discovered that the nss_files backend for the     Name Service Switch in glibc would return incorrect     data to applications or corrupt the heap (depending on     adjacent heap contents). A local attacker could     potentially use this flaw to execute arbitrary code on     the system.(CVE-2015-5277)

  - A directory traveral flaw was found in the way glibc     loaded locale files. An attacker able to make an     application use a specially crafted locale name value     (for example, specified in an LC_* environment     variable) could possibly use this flaw to execute     arbitrary code with the privileges of that     application.(CVE-2014-0475)

  - It was found that out-of-range time values passed to     the strftime() function could result in an     out-of-bounds memory access. This could lead to     application crash or, potentially, information     disclosure.(CVE-2015-8776)

  - The GNU C Library (aka glibc or libc6) before 2.27     contains an off-by-one error leading to a heap-based     buffer overflow in the glob function in glob.c, related     to the processing of home directories using the ~     operator followed by a long string.(CVE-2017-15670)

  - The PTR_MANGLE implementation in the GNU C Library (aka     glibc or libc6) 2.4, 2.17, and earlier, and Embedded     GLIBC (EGLIBC) does not initialize the random value for     the pointer guard, which makes it easier for     context-dependent attackers to control execution flow     by leveraging a buffer-overflow vulnerability in an     application and using the known zero value pointer     guard to calculate a pointer address.(CVE-2013-4788)

  - An out-of-bounds read flaw was found in the way glibc's     iconv() function converted certain encoded data to     UTF-8. An attacker able to make an application call the     iconv() function with a specially crafted argument     could use this flaw to crash that     application.(CVE-2014-6040)

  - A stack overflow vulnerability was found in
    _nss_dns_getnetbyname_r. On systems with nsswitch     configured to include ''networks: dns'' with a     privileged or network-facing service that would attempt     to resolve user-provided network names, an attacker     could provide an excessively long network name,     resulting in stack corruption and code     execution.(CVE-2016-3075)

  - Integer overflow in string/strcoll_l.c in the GNU C     Library (aka glibc or libc6) 2.17 and earlier allows     context-dependent attackers to cause a denial of     service (crash) or possibly execute arbitrary code via     a long string, which triggers a heap-based buffer     overflow.(CVE-2012-4412)

  - A heap-based buffer overflow flaw was found in glibc's     swscanf() function. An attacker able to make an     application call the swscanf() function could use this     flaw to crash that application or, potentially, execute     arbitrary code with the permissions of the user running     the application.(CVE-2015-1472)

  - It was found that getaddrinfo() did not limit the     amount of stack memory used during name resolution. An     attacker able to make an application resolve an     attacker-controlled hostname or IP address could     possibly cause the application to exhaust all stack     memory and crash.(CVE-2013-1914)

  - A stack overflow vulnerability was found in nan*     functions that could cause applications, which process     long strings with the nan function, to crash or,     potentially, execute arbitrary code.(CVE-2014-9761)

  - An out-of-bounds write flaw was found in the way the     glibc's readdir_r() function handled file system     entries longer than the NAME_MAX character constant. A     remote attacker could provide a specially crafted NTFS     or CIFS file system that, when processed by an     application using readdir_r(), would cause that     application to crash or, potentially, allow the     attacker to execute arbitrary code with the privileges     of the user running the application.(CVE-2013-4237)

  - It was discovered that, under certain circumstances,     glibc's getaddrinfo() function would send DNS queries     to random file descriptors. An attacker could     potentially use this flaw to send DNS queries to     unintended recipients, resulting in information     disclosure or data loss due to the application     encountering corrupted data.(CVE-2013-7423)

  - A buffer overflow flaw was found in the way glibc's     gethostbyname_r() and other related functions computed     the size of a buffer when passed a misaligned buffer as     input. An attacker able to make an application call any     of these functions with a misaligned buffer could use     this flaw to crash the application or, potentially,     execute arbitrary code with the permissions of the user     running the application.(CVE-2015-1781)

  - The nss_dns implementation of getnetbyname in GNU C     Library (aka glibc) before 2.21, when the DNS backend     in the Name Service Switch configuration is enabled,     allows remote attackers to cause a denial of service     (infinite loop) by sending a positive answer while a     network name is being process.(CVE-2014-9402)

  - In the GNU C Library (aka glibc or libc6) through 2.29,     proceed_next_node in posix/regexec.c has a heap-based     buffer over-read via an attempted case-insensitive     regular-expression match.(CVE-2019-9169)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update for glibc is now available for Red Hat Enterprise Linux 6.5 Advanced Update Support.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the name service cache daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.

Security Fix(es) :

* It was discovered that, under certain circumstances, glibc's getaddrinfo() function would send DNS queries to random file descriptors. An attacker could potentially use this flaw to send DNS queries to unintended recipients, resulting in information disclosure or data loss due to the application encountering corrupted data.
(CVE-2013-7423)

The remote host is affected by the vulnerability described in GLSA-201602-02 (GNU C Library: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in the GNU C Library:
      The Google Security Team and Red Hat discovered a stack-based buffer         overflow in the send_dg() and send_vc() functions due to a buffer         mismanagement when getaddrinfo() is called with AF_UNSPEC         (CVE-2015-7547).
      The strftime() function access invalid memory when passed         out-of-range data, resulting in a crash (CVE-2015-8776).
      An integer overflow was found in the __hcreate_r() function         (CVE-2015-8778).
      Multiple unbounded stack allocations were found in the catopen()         function (CVE-2015-8779).
    Please review the CVEs referenced below for additional vulnerabilities       that had already been fixed in previous versions of sys-libs/glibc, for       which we have not issued a GLSA before.
  Impact :

    A remote attacker could exploit any application which performs host name       resolution using getaddrinfo() in order to execute arbitrary code or       crash the application. The other vulnerabilities can possibly be       exploited to cause a Denial of Service or leak information.
  Workaround :

    A number of mitigating factors for CVE-2015-7547 have been identified.
      Please review the upstream advisory and references below.

The remote OracleVM system is missing necessary patches to address critical security updates :

  - Update fix for CVE-2015-7547 (#1296028).

  - Create helper threads with enough stack for POSIX AIO     and timers (#1301625).

  - Fix CVE-2015-7547: getaddrinfo stack-based buffer     overflow (#1296028).

  - Support loading more libraries with static TLS     (#1291270).

  - Check for NULL arena pointer in _int_pvalloc (#1256890).

  - Don't change no_dyn_threshold on mallopt failure     (#1256891).

  - Unlock main arena after allocation in calloc (#1256812).

  - Enable robust malloc change again (#1256812).

  - Fix perturbing in malloc on free and simply perturb_byte     (#1256812).

  - Don't fall back to mmap prematurely (#1256812).

  - The malloc deadlock avoidance support has been     temporarily removed since it triggers deadlocks in     certain applications (#1244002).

  - Fix ruserok check to reject, not skip, negative user     checks (#1217186).

  - Optimize ruserok function for large ~/.rhosts     (#1217186).

  - Fix crash in valloc due to the backtrace deadlock fix     (#1207236).

  - Fix buffer overflow in gethostbyname_r with misaligned     buffer (#1209376, CVE-2015-1781).

  - Avoid deadlock in malloc on backtrace (#1066724).

  - Support running applications that use Intel AVX-512     (#1195453).

  - Silence logging of record type mismatch for DNSSEC     records (#1088301).

  - Shrink heap on free when vm.overcommit_memory == 2     (#867679).

  - Enhance nscd to detect any configuration file changes     (#859965).

  - Fix __times handling of EFAULT when buf is NULL     (#1124204).

  - Fix memory leak with dlopen and thread-local storage     variables (#978098).

  - Prevent getaddrinfo from writing DNS queries to random     fd (CVE-2013-7423, - Implement userspace half of in6.h     header coordination (#1053178).

  - Correctely size relocation cache used by profiler     (#1144132).

  - Fix reuse of cached stack leading to bounds overrun of     DTV (#1116050).

  - Return failure in getnetgrent only when all netgroups     have been searched (#1085312).

  - Fix valgrind warning in nscd_stats (#1091915).

  - Initialize xports array (#1159167).

  - Fix tst-default-attr test to not fail on powerpc     (#1023306).

  - Fix parsing of numeric hosts in gethostbyname_r     (CVE-2015-0235, #1183534).

  - Fix typo in nscd/selinux.c (#1125307).

  - Actually run test-iconv modules (#1176907).

  - Fix recursive dlopen (#1154563).

  - Fix crashes on invalid input in IBM gconv modules     (CVE-2014-6040, #1172044).

  - Fix wordexp to honour WRDE_NOCMD (CVE-2014-7817,     #1171296).

  - Fix typo in res_send and res_query (#rh1138769).

Updated glibc packages that fix multiple security issues are now available for Red Hat Enterprise Linux 7.1 Extended Update Support.

Red Hat Product Security has rated this update as having Important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the Name Server Caching Daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.

It was discovered that the nss_files backend for the Name Service Switch in glibc would return incorrect data to applications or corrupt the heap (depending on adjacent heap contents). A local attacker could potentially use this flaw to execute arbitrary code on the system.
(CVE-2015-5277)

It was discovered that, under certain circumstances, glibc's getaddrinfo() function would send DNS queries to random file descriptors. An attacker could potentially use this flaw to send DNS queries to unintended recipients, resulting in information disclosure or data loss due to the application encountering corrupted data.
(CVE-2013-7423)

A buffer overflow flaw was found in the way glibc's gethostbyname_r() and other related functions computed the size of a buffer when passed a misaligned buffer as input. An attacker able to make an application call any of these functions with a misaligned buffer could use this flaw to crash the application or, potentially, execute arbitrary code with the permissions of the user running the application.
(CVE-2015-1781)

A heap-based buffer overflow flaw and a stack overflow flaw were found in glibc's swscanf() function. An attacker able to make an application call the swscanf() function could use these flaws to crash that application or, potentially, execute arbitrary code with the permissions of the user running the application. (CVE-2015-1472, CVE-2015-1473)

The CVE-2015-5277 issue was discovered by Sumit Bose and Lukas Slebodnik of Red Hat, and the CVE-2015-1781 issue was discovered by Arjun Shankar of Red Hat.

All glibc users are advised to upgrade to these updated packages, which contain backported patches to correct these issues.

It was discovered that, under certain circumstances, glibc's getaddrinfo() function would send DNS queries to random file descriptors. An attacker could potentially use this flaw to send DNS queries to unintended recipients, resulting in information disclosure or data loss due to the application encountering corrupted data.
(CVE-2013-7423)

A buffer overflow flaw was found in the way glibc's gethostbyname_r() and other related functions computed the size of a buffer when passed a misaligned buffer as input. An attacker able to make an application call any of these functions with a misaligned buffer could use this flaw to crash the application or, potentially, execute arbitrary code with the permissions of the user running the application.
(CVE-2015-1781)

A heap-based buffer overflow flaw and a stack overflow flaw were found in glibc's swscanf() function. An attacker able to make an application call the swscanf() function could use these flaws to crash that application or, potentially, execute arbitrary code with the permissions of the user running the application. (CVE-2015-1472, CVE-2015-1473)

An integer overflow flaw, leading to a heap-based buffer overflow, was found in glibc's _IO_wstr_overflow() function. An attacker able to make an application call this function could use this flaw to crash that application or, potentially, execute arbitrary code with the permissions of the user running the application.

A flaw was found in the way glibc's fnmatch() function processed certain malformed patterns. An attacker able to make an application call this function could use this flaw to crash that application.

A buffer overflow flaw was found in the way glibc's gethostbyname_r() and other related functions computed the size of a buffer when passed a misaligned buffer as input. An attacker able to make an application call any of these functions with a misaligned buffer could use this flaw to crash the application or, potentially, execute arbitrary code with the permissions of the user running the application.
(CVE-2015-1781)

It was discovered that the nss_files backend for the Name Service Switch in glibc would return incorrect data to applications or corrupt the heap (depending on adjacent heap contents). A local attacker could potentially use this flaw to execute arbitrary code on the system.
(CVE-2015-5277)

It was discovered that, under certain circumstances, glibc's getaddrinfo() function would send DNS queries to random file descriptors. An attacker could potentially use this flaw to send DNS queries to unintended recipients, resulting in information disclosure or data loss due to the application encountering corrupted data.
(CVE-2013-7423)

A stack overflow flaw was found in glibc's swscanf() function. An attacker able to make an application call the swscanf() function could use this flaw to crash that application or, potentially, execute arbitrary code with the permissions of the user running the application. (CVE-2015-1473)

A heap-based buffer overflow flaw was found in glibc's swscanf() function. An attacker able to make an application call the swscanf() function could use this flaw to crash that application or, potentially, execute arbitrary code with the permissions of the user running the application. (CVE-2015-1472)

Updated glibc packages that fix multiple security issues, several bugs, and add one enhancement are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the Name Server Caching Daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.

It was discovered that, under certain circumstances, glibc's getaddrinfo() function would send DNS queries to random file descriptors. An attacker could potentially use this flaw to send DNS queries to unintended recipients, resulting in information disclosure or data loss due to the application encountering corrupted data.
(CVE-2013-7423)

A buffer overflow flaw was found in the way glibc's gethostbyname_r() and other related functions computed the size of a buffer when passed a misaligned buffer as input. An attacker able to make an application call any of these functions with a misaligned buffer could use this flaw to crash the application or, potentially, execute arbitrary code with the permissions of the user running the application.
(CVE-2015-1781)

A heap-based buffer overflow flaw and a stack overflow flaw were found in glibc's swscanf() function. An attacker able to make an application call the swscanf() function could use these flaws to crash that application or, potentially, execute arbitrary code with the permissions of the user running the application. (CVE-2015-1472, CVE-2015-1473)

An integer overflow flaw, leading to a heap-based buffer overflow, was found in glibc's _IO_wstr_overflow() function. An attacker able to make an application call this function could use this flaw to crash that application or, potentially, execute arbitrary code with the permissions of the user running the application. (BZ#1195762)

A flaw was found in the way glibc's fnmatch() function processed certain malformed patterns. An attacker able to make an application call this function could use this flaw to crash that application.
(BZ#1197730)

The CVE-2015-1781 issue was discovered by Arjun Shankar of Red Hat.

These updated glibc packages also include numerous bug fixes and one enhancement. Space precludes documenting all of these changes in this advisory. For information on the most significant of these changes, users are directed to the following article on the Red Hat Customer Portal :

https://access.redhat.com/articles/2050743

All glibc users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements.

From Red Hat Security Advisory 2015:2199 :

Updated glibc packages that fix multiple security issues, several bugs, and add one enhancement are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the Name Server Caching Daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.

It was discovered that, under certain circumstances, glibc's getaddrinfo() function would send DNS queries to random file descriptors. An attacker could potentially use this flaw to send DNS queries to unintended recipients, resulting in information disclosure or data loss due to the application encountering corrupted data.
(CVE-2013-7423)

A buffer overflow flaw was found in the way glibc's gethostbyname_r() and other related functions computed the size of a buffer when passed a misaligned buffer as input. An attacker able to make an application call any of these functions with a misaligned buffer could use this flaw to crash the application or, potentially, execute arbitrary code with the permissions of the user running the application.
(CVE-2015-1781)

A heap-based buffer overflow flaw and a stack overflow flaw were found in glibc's swscanf() function. An attacker able to make an application call the swscanf() function could use these flaws to crash that application or, potentially, execute arbitrary code with the permissions of the user running the application. (CVE-2015-1472, CVE-2015-1473)

An integer overflow flaw, leading to a heap-based buffer overflow, was found in glibc's _IO_wstr_overflow() function. An attacker able to make an application call this function could use this flaw to crash that application or, potentially, execute arbitrary code with the permissions of the user running the application. (BZ#1195762)

A flaw was found in the way glibc's fnmatch() function processed certain malformed patterns. An attacker able to make an application call this function could use this flaw to crash that application.
(BZ#1197730)

The CVE-2015-1781 issue was discovered by Arjun Shankar of Red Hat.

These updated glibc packages also include numerous bug fixes and one enhancement. Space precludes documenting all of these changes in this advisory. For information on the most significant of these changes, users are directed to the following article on the Red Hat Customer Portal :

https://access.redhat.com/articles/2050743

All glibc users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2015:2199 advisory.

  - glibc: getaddrinfo() writes DNS queries to random file descriptors under high load (CVE-2013-7423)

  - glibc: heap buffer overflow in glibc swscanf (CVE-2015-1472)

  - glibc: Stack-overflow in glibc swscanf (CVE-2015-1473)

  - glibc: buffer overflow in gethostbyname_r() and related functions with misaligned buffer (CVE-2015-1781)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

glibc has been updated to fix four security issues :

  - CVE-2014-0475: Directory traversal in locale environment     handling (bnc#887022)

  - CVE-2014-7817: wordexp failed to honour WRDE_NOCMD     (bsc#906371)

  - CVE-2014-9402: Avoid infinite loop in nss_dns     getnetbyname (bsc#910599)

  - CVE-2015-1472: Fixed buffer overflow in wscanf     (bsc#916222)

  - CVE-2013-7423: getaddrinfo() wrote DNS queries to random     file descriptors under high load. (bnc#915526)

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

glibc has been updated to fix four security issues :

  - CVE-2014-0475: Directory traversal in locale environment     handling (bnc#887022)

  - CVE-2014-7817: wordexp failed to honour WRDE_NOCMD     (bsc#906371)

  - CVE-2014-9402: Avoid infinite loop in nss_dns     getnetbyname (bsc#910599)

  - CVE-2015-1472: Fixed buffer overflow in wscanf     (bsc#916222)

This non-security issue has been fixed :

  - Fix missing zero termination (bnc#918233)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

glibc has been updated to fix four security issues.

These security issues were fixed :

  - CVE-2014-7817: The wordexp function in GNU C Library     (aka glibc) 2.21 did not enforce the WRDE_NOCMD flag,     which allowed context-dependent attackers to execute     arbitrary commands, as demonstrated by input containing     '$((`...`))' (bnc#906371).

  - CVE-2015-1472: Heap buffer overflow in glibc swscanf     (bnc#916222).

  - CVE-2014-9402: Denial of service in getnetbyname     function (bnc#910599).

  - CVE-2013-7423: Getaddrinfo() writes DNS queries to     random file descriptors under high load (bnc#915526).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Multiple vulnerabilities has been found and corrected in glibc :

It was discovered that, under certain circumstances, glibc's getaddrinfo function would send DNS queries to random file descriptors. An attacker could potentially use this flaw to send DNS queries to unintended recipients, resulting in information disclosure or data loss due to the application encountering corrupted data (CVE-2013-7423).

A buffer overflow flaw was found in the way glibc's gethostbyname_r and other related functions computed the size of a buffer when passed a misaligned buffer as input. An attacker able to make an application call any of these functions with a misaligned buffer could use this flaw to crash the application or, potentially, execute arbitrary code with the permissions of the user running the application (CVE-2015-1781).

The updated packages provides a solution for these security issues.

A buffer overflow flaw was found in the way glibc's gethostbyname_r() and other related functions computed the size of a buffer when passed a misaligned buffer as input. An attacker able to make an application call any of these functions with a misaligned buffer could use this flaw to crash the application or, potentially, execute arbitrary code with the permissions of the user running the application.
(CVE-2015-1781)

It was discovered that, under certain circumstances, glibc's getaddrinfo() function would send DNS queries to random file descriptors. An attacker could potentially use this flaw to send DNS queries to unintended recipients, resulting in information disclosure or data loss due to the application encountering corrupted data.
(CVE-2013-7423)

A buffer overflow flaw was found in the way glibc's gethostbyname_r() and other related functions computed the size of a buffer when passed a misaligned buffer as input. An attacker able to make an application call any of these functions with a misaligned buffer could use this flaw to crash the application or, potentially, execute arbitrary code with the permissions of the user running the application.
(CVE-2015-1781)

It was discovered that, under certain circumstances, glibc's getaddrinfo() function would send DNS queries to random file descriptors. An attacker could potentially use this flaw to send DNS queries to unintended recipients, resulting in information disclosure or data loss due to the application encountering corrupted data.
(CVE-2013-7423)

This update also fixes the following bug :

  - Previously, the nscd daemon did not properly reload     modified data when the user edited monitored nscd     configuration files. As a consequence, nscd returned     stale data to system processes. This update adds a     system of inotify-based monitoring and stat-based backup     monitoring for nscd configuration files. As a result,     nscd now detects changes to its configuration files and     reloads the data properly, which prevents it from     returning stale data.

Updated glibc packages that fix two security issues and one bug are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the Name Server Caching Daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.

A buffer overflow flaw was found in the way glibc's gethostbyname_r() and other related functions computed the size of a buffer when passed a misaligned buffer as input. An attacker able to make an application call any of these functions with a misaligned buffer could use this flaw to crash the application or, potentially, execute arbitrary code with the permissions of the user running the application.
(CVE-2015-1781)

It was discovered that, under certain circumstances, glibc's getaddrinfo() function would send DNS queries to random file descriptors. An attacker could potentially use this flaw to send DNS queries to unintended recipients, resulting in information disclosure or data loss due to the application encountering corrupted data.
(CVE-2013-7423)

The CVE-2015-1781 issue was discovered by Arjun Shankar of Red Hat.

This update also fixes the following bug :

* Previously, the nscd daemon did not properly reload modified data when the user edited monitored nscd configuration files. As a consequence, nscd returned stale data to system processes. This update adds a system of inotify-based monitoring and stat-based backup monitoring for nscd configuration files. As a result, nscd now detects changes to its configuration files and reloads the data properly, which prevents it from returning stale data. (BZ#1194149)

All glibc users are advised to upgrade to these updated packages, which contain backported patches to correct these issues.

The remote OracleVM system is missing necessary patches to address critical security updates :

  - Fix invalid file descriptor reuse while sending DNS     query (#1207995, CVE-2013-7423).

  - Fix buffer overflow in gethostbyname_r with misaligned     buffer (#1209375, CVE-2015-1781).

  - Enhance nscd to detect any configuration file changes     (#1194149).

From Red Hat Security Advisory 2015:0863 :

Updated glibc packages that fix two security issues and one bug are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the Name Server Caching Daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.

A buffer overflow flaw was found in the way glibc's gethostbyname_r() and other related functions computed the size of a buffer when passed a misaligned buffer as input. An attacker able to make an application call any of these functions with a misaligned buffer could use this flaw to crash the application or, potentially, execute arbitrary code with the permissions of the user running the application.
(CVE-2015-1781)

It was discovered that, under certain circumstances, glibc's getaddrinfo() function would send DNS queries to random file descriptors. An attacker could potentially use this flaw to send DNS queries to unintended recipients, resulting in information disclosure or data loss due to the application encountering corrupted data.
(CVE-2013-7423)

The CVE-2015-1781 issue was discovered by Arjun Shankar of Red Hat.

This update also fixes the following bug :

* Previously, the nscd daemon did not properly reload modified data when the user edited monitored nscd configuration files. As a consequence, nscd returned stale data to system processes. This update adds a system of inotify-based monitoring and stat-based backup monitoring for nscd configuration files. As a result, nscd now detects changes to its configuration files and reloads the data properly, which prevents it from returning stale data. (BZ#1194149)

All glibc users are advised to upgrade to these updated packages, which contain backported patches to correct these issues.

Several vulnerabilities have been fixed in eglibc, Debian's version of the GNU C library.

#553206 CVE-2015-1472 CVE-2015-1473

The scanf family of functions do not properly limit stack allocation, which allows context-dependent attackers to cause a denial of service (crash) or possibly execute arbitrary code.

CVE-2012-3405

The printf family of functions do not properly calculate a buffer length, which allows context-dependent attackers to bypass the FORTIFY_SOURCE format-string protection mechanism and cause a denial of service.

CVE-2012-3406

The printf family of functions do not properly limit stack allocation, which allows context-dependent attackers to bypass the FORTIFY_SOURCE format-string protection mechanism and cause a denial of service (crash) or possibly execute arbitrary code via a crafted format string.

CVE-2012-3480

Multiple integer overflows in the strtod, strtof, strtold, strtod_l, and other related functions allow local users to cause a denial of service (application crash) and possibly execute arbitrary code via a long string, which triggers a stack-based buffer overflow.

CVE-2012-4412

Integer overflow in the strcoll and wcscoll functions allows context-dependent attackers to cause a denial of service (crash) or possibly execute arbitrary code via a long string, which triggers a heap-based buffer overflow.

CVE-2012-4424

Stack-based buffer overflow in the strcoll and wcscoll functions allows context-dependent attackers to cause a denial of service (crash) or possibly execute arbitrary code via a long string that triggers a malloc failure and use of the alloca function.

CVE-2013-0242

Buffer overflow in the extend_buffers function in the regular expression matcher allows context-dependent attackers to cause a denial of service (memory corruption and crash) via crafted multibyte characters.

CVE-2013-1914 CVE-2013-4458

Stack-based buffer overflow in the getaddrinfo function allows remote attackers to cause a denial of service (crash) via a hostname or IP address that triggers a large number of domain conversion results.

CVE-2013-4237

readdir_r allows context-dependent attackers to cause a denial of service (out-of-bounds write and crash) or possibly execute arbitrary code via a malicious NTFS image or CIFS service.

CVE-2013-4332

Multiple integer overflows in malloc/malloc.c allow context-dependent attackers to cause a denial of service (heap corruption) via a large value to the pvalloc, valloc, posix_memalign, memalign, or aligned_alloc functions.

CVE-2013-4357

The getaliasbyname, getaliasbyname_r, getaddrinfo, getservbyname, getservbyname_r, getservbyport, getservbyport_r, and glob functions do not properly limit stack allocation, which allows context-dependent attackers to cause a denial of service (crash) or possibly execute arbitrary code.

CVE-2013-4788

When the GNU C library is statically linked into an executable, the PTR_MANGLE implementation does not initialize the random value for the pointer guard, so that various hardening mechanisms are not effective.

CVE-2013-7423

The send_dg function in resolv/res_send.c does not properly reuse file descriptors, which allows remote attackers to send DNS queries to unintended locations via a large number of requests that trigger a call to the getaddrinfo function.

CVE-2013-7424

The getaddrinfo function may attempt to free an invalid pointer when handling IDNs (Internationalised Domain Names), which allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code.

CVE-2014-4043

The posix_spawn_file_actions_addopen function does not copy its path argument in accordance with the POSIX specification, which allows context-dependent attackers to trigger use-after-free vulnerabilities.

For the oldstable distribution (squeeze), these problems have been fixed in version 2.11.3-4+deb6u5.

For the stable distribution (wheezy), these problems were fixed in version 2.13-38+deb7u8 or earlier.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

glibc has ben updated to fix three security issues :

  - wordexp failed to honour WRDE_NOCMD (bsc#906371).
    (CVE-2014-7817)

  - Fixed invalid file descriptor reuse while sending DNS     query (bsc#915526). (CVE-2013-7423)

  - Fixed buffer overflow in wscanf (bsc#916222) These     non-security issues have been fixed:. (CVE-2015-1472)

  - Remove inaccurate assembler implementations of ceill,     floorl, nearbyintl, roundl, truncl for PowerPC64     (bsc#917072)

  - Don't return IPv4 addresses when looking for IPv6     addresses only (bsc#904461)

Arnaud Le Blanc discovered that the GNU C Library incorrectly handled file descriptors when resolving DNS queries under high load. This may cause a denial of service in other applications, or an information leak. This issue only affected Ubuntu 10.04 LTS, Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2013-7423)

It was discovered that the GNU C Library incorrectly handled receiving a positive answer while processing the network name when performing DNS resolution. A remote attacker could use this issue to cause the GNU C Library to hang, resulting in a denial of service.
(CVE-2014-9402)

Joseph Myers discovered that the GNU C Library wscanf function incorrectly handled memory. A remote attacker could possibly use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 14.10. (CVE-2015-1472, CVE-2015-1473).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Glibc was updated to fix several security issues.

  - Avoid infinite loop in nss_dns getnetbyname     (CVE-2014-9402, bsc#910599, BZ #17630)

  - wordexp fails to honour WRDE_NOCMD (CVE-2014-7817,     bsc#906371, BZ #17625)

  - Fix invalid file descriptor reuse while sending DNS     query (CVE-2013-7423, bsc#915526, BZ #15946)

  - Fix buffer overflow in wscanf (CVE-2015-1472,     bsc#916222, BZ #16618)

ID	Name	Product	Family	Severity
125005	EulerOS Virtualization 3.0.1.0 : glibc (EulerOS-SA-2019-1552)	Nessus	Huawei Local Security Checks	critical
91497	RHEL 6 : glibc (RHSA-2016:1207)	Nessus	Red Hat Local Security Checks	medium
88822	GLSA-201602-02 : GNU C Library: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
88783	OracleVM 3.3 : glibc (OVMSA-2016-0013) (GHOST)	Nessus	OracleVM Local Security Checks	high
88573	RHEL 7 : glibc (RHSA-2015:2589)	Nessus	Red Hat Local Security Checks	high
87556	Scientific Linux Security Update : glibc on SL7.x x86_64 (20151119)	Nessus	Scientific Linux Local Security Checks	high
87343	Amazon Linux AMI : glibc (ALAS-2015-617)	Nessus	Amazon Linux Local Security Checks	high
87142	CentOS 7 : glibc (CESA-2015:2199)	Nessus	CentOS Local Security Checks	high
87092	Oracle Linux 7 : glibc (ELSA-2015-2199)	Nessus	Oracle Linux Local Security Checks	high
86937	RHEL 7 : glibc (RHSA-2015:2199)	Nessus	Red Hat Local Security Checks	high
83705	SUSE SLES11 Security Update : glibc (SUSE-SU-2015:0551-1)	Nessus	SuSE Local Security Checks	high
83704	SUSE SLES10 Security Update : glibc (SUSE-SU-2015:0550-1)	Nessus	SuSE Local Security Checks	high
83701	SUSE SLED12 / SLES12 Security Update : glibc (SUSE-SU-2015:0526-1)	Nessus	SuSE Local Security Checks	high
83170	Mandriva Linux Security Advisory : glibc (MDVSA-2015:218)	Nessus	Mandriva Local Security Checks	medium
83056	Amazon Linux AMI : glibc (ALAS-2015-513)	Nessus	Amazon Linux Local Security Checks	medium
82987	Scientific Linux Security Update : glibc on SL6.x i386/x86_64 (20150421)	Nessus	Scientific Linux Local Security Checks	medium
82984	RHEL 6 : glibc (RHSA-2015:0863)	Nessus	Red Hat Local Security Checks	medium
82983	OracleVM 3.3 : glibc (OVMSA-2015-0055)	Nessus	OracleVM Local Security Checks	medium
82980	Oracle Linux 6 : glibc (ELSA-2015-0863)	Nessus	Oracle Linux Local Security Checks	medium
82928	CentOS 6 : glibc (CESA-2015:0863)	Nessus	CentOS Local Security Checks	medium
82149	Debian DLA-165-1 : eglibc security update	Nessus	Debian Local Security Checks	high
81667	SuSE 11.3 Security Update : glibc (SAT Patch Number 10357)	Nessus	SuSE Local Security Checks	high
81572	Ubuntu 14.04 LTS : GNU C Library vulnerabilities (USN-2519-1)	Nessus	Ubuntu Local Security Checks	high
81560	openSUSE Security Update : glibc (openSUSE-2015-173)	Nessus	SuSE Local Security Checks	high

Detections

Analytics

CVE-2013-7423

high

Tenable Plugins

critical

medium

critical

high

high

high

high

high

high

high

high

high

high

medium

medium

medium

medium

medium

medium

medium

high

high

high

high