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)

glibc was updated to fix security issues and bugs :

  - Separate internal state between getXXent and getXXbyYY     NSS calls (CVE-2014-8121, bsc#918187, BZ #18007)

  - Fix read past end of pattern in fnmatch (bsc#920338, BZ     #17062, BZ #18032, BZ #18036)

  - Fix buffer overflow in nss_dns (CVE-2015-1781,     bsc#927080, BZ #18287)

Also this bug got fixed :

  - Simplify handling of nameserver configuration in     resolver (bsc#917539)

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.

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).

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.

ID	Name	Product	Family	Published	Updated	Severity
83056	Amazon Linux AMI : glibc (ALAS-2015-513)	Nessus	Amazon Linux Local Security Checks	4/27/2015	4/18/2018	medium
83867	openSUSE Security Update : glibc / glibc-testsuite / glibc-utils / etc (openSUSE-2015-383)	Nessus	SuSE Local Security Checks	5/28/2015	1/19/2021	medium
88573	RHEL 7 : glibc (RHSA-2015:2589)	Nessus	Red Hat Local Security Checks	2/4/2016	10/24/2019	high
88783	OracleVM 3.3 : glibc (OVMSA-2016-0013) (GHOST)	Nessus	OracleVM Local Security Checks	2/17/2016	6/18/2024	high
88822	GLSA-201602-02 : GNU C Library: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2/18/2016	6/18/2024	critical

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