The DNS stub resolver in the GNU C Library (aka glibc or libc6) before version 2.26, when EDNS support is enabled, will solicit large UDP responses from name servers, potentially simplifying off-path DNS spoofing attacks due to IP fragmentation.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - The DNS stub resolver in the GNU C Library (aka glibc or libc6) before version 2.26, when EDNS support is     enabled, will solicit large UDP responses from name servers, potentially simplifying off-path DNS spoofing     attacks due to IP fragmentation. (CVE-2017-12132)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Ubuntu 16.04 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5768-1 advisory.

    Jan Engelhardt, Tavis Ormandy, and others discovered that the GNU C Library iconv feature incorrectly     handled certain input sequences. An attacker could possibly use this issue to cause the GNU C Library to     hang or crash, resulting in a denial of service.

    (CVE-2016-10228, CVE-2019-25013, CVE-2020-27618)

    It was discovered that the GNU C Library did not properly handled DNS responses when ENDS0 is enabled. An     attacker could possibly use this issue to cause fragmentation-based attacks. (CVE-2017-12132)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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

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

  - Stack-based buffer overflow in the clntudp_call     function in sunrpc/clnt_udp.c in the GNU C Library (aka     glibc or libc6) allows remote servers to cause a denial     of service (crash) or possibly unspecified other impact     via a flood of crafted ICMP and UDP     packets.(CVE-2016-4429)

  - Integer overflow in the strxfrm function in the GNU C     Library (aka glibc or libc6) before 2.21 allows     context-dependent attackers to cause a denial of     service (crash) or possibly execute arbitrary code via     a long string, which triggers a stack-based buffer     overflow.(CVE-2015-8982)

  - The posix_spawn_file_actions_addopen function in glibc     before 2.20 does not copy its path argument in     accordance with the POSIX specification, which allows     context-dependent attackers to trigger use-after-free     vulnerabilities.(CVE-2014-4043)

  - res_query in libresolv in glibc before 2.25 allows     remote attackers to cause a denial of service (NULL     pointer dereference and process crash).(CVE-2015-5180)

  - A buffer overflow has been discovered in the GNU C     Library (aka glibc or libc6) in the
    __mempcpy_avx512_no_vzeroupper function when particular     conditions are met. An attacker could use this     vulnerability to cause a denial of service or     potentially execute code.(CVE-2018-11237)

  - 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)

  - The iconv program in the GNU C Library (aka glibc or     libc6) 2.25 and earlier, when invoked with the -c     option, enters an infinite loop when processing invalid     multi-byte input sequences, leading to a denial of     service.(CVE-2016-10228)

  - The DNS stub resolver in the GNU C Library (aka glibc     or libc6) before version 2.26, when EDNS support is     enabled, will solicit large UDP responses from name     servers, potentially simplifying off-path DNS spoofing     attacks due to IP fragmentation.(CVE-2017-12132)

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.

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

  - Stack-based buffer overflow in the glob implementation     in GNU C Library (aka glibc) before 2.24, when     GLOB_ALTDIRFUNC is used, allows context-dependent     attackers to cause a denial of service (crash) via a     long name.(CVE-2016-1234)

  - The DNS stub resolver in the GNU C Library (aka glibc     or libc6) before version 2.26, when EDNS support is     enabled, will solicit large UDP responses from name     servers, potentially simplifying off-path DNS spoofing     attacks due to IP fragmentation.(CVE-2017-12132)

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.

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has glibc packages installed that are affected by multiple vulnerabilities:

  - 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 DNS stub resolver in the GNU C Library (aka glibc or     libc6) before version 2.26, when EDNS support is     enabled, will solicit large UDP responses from name     servers, potentially simplifying off-path DNS spoofing     attacks due to IP fragmentation. (CVE-2017-12132)

  - The glob function in glob.c in the GNU C Library (aka     glibc or libc6) before 2.27 contains a buffer overflow     during unescaping of user names with the ~ operator.
    (CVE-2017-15804)

  - res_query in libresolv in glibc before 2.25 allows     remote attackers to cause a denial of service (NULL     pointer dereference and process crash). (CVE-2015-5180)

  - 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 glibc 2.26 and earlier there is confusion in the     usage of getcwd() by realpath() which can be used to     write before the destination buffer leading to a buffer     underflow and potential code execution.
    (CVE-2018-1000001)

  - Stack-based buffer overflow in the getaddrinfo function     in sysdeps/posix/getaddrinfo.c in the GNU C Library (aka     glibc or libc6) allows remote attackers to cause a     denial of service (crash) via vectors involving hostent     conversion. NOTE: this vulnerability exists because of     an incomplete fix for CVE-2013-4458. (CVE-2016-3706)

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

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

  - stdlib/canonicalize.c in the GNU C Library (aka glibc     or libc6) 2.27 and earlier, when processing very long     pathname arguments to the realpath function, could     encounter an integer overflow on 32-bit architectures,     leading to a stack-based buffer overflow and,     potentially, arbitrary code execution.(CVE-2018-11236)

  - An integer overflow vulnerability was found in     hcreate() and hcreate_r() functions which could result     in an out-of-bounds memory access. This could lead to     application crash or, potentially, arbitrary code     execution.(CVE-2015-8778)

  - A stack-based buffer overflow was found in the way the     libresolv library performed dual A/AAAA DNS queries. A     remote attacker could create a specially crafted DNS     response which could cause libresolv to crash or,     potentially, execute code with the permissions of the     user running the library. Note: this issue is only     exposed when libresolv is called from the nss_dns NSS     service module.(CVE-2015-7547)

  - A flaw was found in the regular expression matching     routines that process multibyte character input. If an     application utilized the glibc regular expression     matching mechanism, an attacker could provide     specially-crafted input that, when processed, would     cause the application to crash.(CVE-2013-0242)

  - A flaw was found in the way memory was being allocated     on the stack for user space binaries. If heap (or     different memory region) and stack memory regions were     adjacent to each other, an attacker could use this flaw     to jump over the stack guard gap, cause controlled     memory corruption on process stack or the adjacent     memory region, and thus increase their privileges on     the system. This is glibc-side mitigation which blocks     processing of LD_LIBRARY_PATH for programs running in     secure-execution mode and reduces the number of     allocations performed by the processing of LD_AUDIT,     LD_PRELOAD, and LD_HWCAP_MASK, making successful     exploitation of this issue more     difficult.(CVE-2017-1000366)

  - The DNS stub resolver in the GNU C Library (aka glibc     or libc6) before version 2.26, when EDNS support is     enabled, will solicit large UDP responses from name     servers, potentially simplifying off-path DNS spoofing     attacks due to IP fragmentation.(CVE-2017-12132)

  - It was found that the files back end of Name Service     Switch (NSS) did not isolate iteration over an entire     database from key-based look-up API calls. An     application performing look-ups on a database while     iterating over it could enter an infinite loop, leading     to a denial of service.(CVE-2014-8121)

  - Stack-based buffer overflow in the getaddrinfo function     in sysdeps/posix/getaddrinfo.c in the GNU C Library     (aka glibc or libc6) allows remote attackers to cause a     denial of service (crash) via vectors involving hostent     conversion. NOTE: this vulnerability exists because of     an incomplete fix for CVE-2013-4458.(CVE-2016-3706)

  - In glibc 2.26 and earlier there is confusion in the     usage of getcwd() by realpath() which can be used to     write before the destination buffer leading to a buffer     underflow and potential code     execution.(CVE-2018-1000001)

  - Stack-based buffer 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 that triggers a malloc failure and use of     the alloca function.(CVE-2012-4424)

  - It was found that the dynamic loader did not sanitize     the LD_POINTER_GUARD environment variable. An attacker     could use this flaw to bypass the pointer guarding     protection on set-user-ID or set-group-ID programs to     execute arbitrary code with the permissions of the user     running the application.(CVE-2015-8777)

  - The glob function in glob.c in the GNU C Library (aka     glibc or libc6) before 2.27 contains a buffer overflow     during unescaping of user names with the ~     operator.(CVE-2017-15804)

  - res_query in libresolv in glibc before 2.25 allows     remote attackers to cause a denial of service (NULL     pointer dereference and process crash).(CVE-2015-5180)

  - pt_chown in GNU C Library (aka glibc or libc6) before     2.18 does not properly check permissions for tty files,     which allows local users to change the permission on     the files and obtain access to arbitrary     pseudo-terminals by leveraging a FUSE file     system.(CVE-2013-2207)

  - 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)

  - 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-2013-4458)

  - A heap-based buffer overflow was found in glibc's
    __nss_hostname_digits_dots() function, which is used by     the gethostbyname() and gethostbyname2() glibc function     calls. A remote attacker able to make an application     call either of these functions could use this flaw to     execute arbitrary code with the permissions of the user     running the application.(CVE-2015-0235)

  - Multiple integer overflow flaws, leading to heap-based     buffer overflows, were found in glibc's memory     allocator functions (pvalloc, valloc, and memalign). If     an application used such a function, it could cause the     application to crash or, potentially, execute arbitrary     code with the privileges of the user running the     application.(CVE-2013-4332)

  - An integer overflow in the implementation of the     posix_memalign in memalign functions in the GNU C     Library (aka glibc or libc6) 2.26 and earlier could     cause these functions to return a pointer to a heap     area that is too small, potentially leading to heap     corruption.(CVE-2018-6485)

  - A stack based buffer overflow vulnerability was found     in the catopen() function. An excessively long string     passed to the function could cause it to crash or,     potentially, execute arbitrary code.(CVE-2015-8779)

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.

This update for glibc fixes the following issues: Security issues fixed :

  - CVE-2017-15804: Fix buffer overflow during unescaping of     user names in the glob function in glob.c (bsc#1064580).

  - CVE-2017-15670: Fix buffer overflow in glob with     GLOB_TILDE (bsc#1064583).

  - CVE-2017-15671: Fix memory leak in glob with GLOB_TILDE     (bsc#1064569).

  - CVE-2018-11236: Fix 32bit arch integer overflow in     stdlib/canonicalize.c when processing very long pathname     arguments (bsc#1094161).

  - CVE-2017-12132: Reduce advertised EDNS0 buffer size to     guard against fragmentation attacks (bsc#1051791).

  - CVE-2018-1000001: Avoid underflow of malloced area     (bsc#1074293).

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.

This update for glibc fixes the following issues: Security issues fixed :

  - CVE-2017-15804: Fix buffer overflow during unescaping of     user names in the glob function in glob.c (bsc#1064580).

  - CVE-2017-15670: Fix buffer overflow in glob with     GLOB_TILDE (bsc#1064583).

  - CVE-2017-15671: Fix memory leak in glob with GLOB_TILDE     (bsc#1064569).

  - CVE-2018-11236: Fix 32bit arch integer overflow in     stdlib/canonicalize.c when processing very long pathname     arguments (bsc#1094161).

  - CVE-2017-12132: Reduce advertised EDNS0 buffer size to     guard against fragmentation attacks (bsc#1051791).

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.

Fragmentation attacks possible when EDNS0 is enabled

The DNS stub resolver in the GNU C Library (aka glibc or libc6) before version 2.26, when EDNS support is enabled, will solicit large UDP responses from name servers, potentially simplifying off-path DNS spoofing attacks due to IP fragmentation.(CVE-2017-12132)

Buffer overflow in glob with GLOB_TILDE

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)

Denial of service in getnetbyname function

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)

DNS resolver NULL pointer dereference with crafted record type

res_query in libresolv in glibc before 2.25 allows remote attackers to cause a denial of service (NULL pointer dereference and process crash).(CVE-2015-5180)

realpath() buffer underflow when getcwd() returns relative path allows privilege escalation

In glibc 2.26 and earlier there is confusion in the usage of getcwd() by realpath() which can be used to write before the destination buffer leading to a buffer underflow and potential code execution.(CVE-2018-1000001)

Buffer overflow during unescaping of user names with the ~ operator

The glob function in glob.c in the GNU C Library (aka glibc or libc6) before 2.27 contains a buffer overflow during unescaping of user names with the ~ operator.(CVE-2017-15804)

Security Fix(es) :

  - glibc: realpath() buffer underflow when getcwd() returns     relative path allows privilege escalation     (CVE-2018-1000001)

  - glibc: Buffer overflow in glob with GLOB_TILDE     (CVE-2017-15670)

  - glibc: Buffer overflow during unescaping of user names     with the ~ operator (CVE-2017-15804)

  - glibc: denial of service in getnetbyname function     (CVE-2014-9402)

  - glibc: DNS resolver NULL pointer dereference with     crafted record type (CVE-2015-5180)

  - glibc: Fragmentation attacks possible when EDNS0 is     enabled (CVE-2017-12132)

Additional Changes :

An update for glibc is now available for Red Hat Enterprise Linux 7.

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) :

* glibc: realpath() buffer underflow when getcwd() returns relative path allows privilege escalation (CVE-2018-1000001)

* glibc: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)

* glibc: Buffer overflow during unescaping of user names with the ~ operator (CVE-2017-15804)

* glibc: denial of service in getnetbyname function (CVE-2014-9402)

* glibc: DNS resolver NULL pointer dereference with crafted record type (CVE-2015-5180)

* glibc: Fragmentation attacks possible when EDNS0 is enabled (CVE-2017-12132)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Red Hat would like to thank halfdog for reporting CVE-2018-1000001.
The CVE-2015-5180 issue was discovered by Florian Weimer (Red Hat Product Security).

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.5 Release Notes linked from the References section.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2018-0805 advisory.

    - CVE-2018-1000001: Fix realpath() buffer underflow (#1534635)
    - CVE-2017-15670: glob: Fix one-byte overflow with GLOB_TILDE (#1504809)
    - CVE-2017-15804: glob: Fix buffer overflow in GLOB_TILDE unescaping (#1504809)
    - CVE-2017-1213: Fragmentation attacks possible when ENDS0 is enabled       (#1487063)
    - CVE-2016-3706: Stack (frame) overflow in getaddrinfo when called       with AF_INET, AF_INET6 (#1329674)
    - CVE-2015-5180: resolv: Fix crash with internal QTYPE (#1497131)
    - CVE-2014-9402: denial of service in getnetbyname function (#1497132)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

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

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:0805 advisory.

  - glibc: denial of service in getnetbyname function (CVE-2014-9402)

  - glibc: DNS resolver NULL pointer dereference with crafted record type (CVE-2015-5180)

  - glibc: Fragmentation attacks possible when EDNS0 is enabled (CVE-2017-12132)

  - glibc: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)

  - glibc: Buffer overflow during unescaping of user names with the ~ operator (CVE-2017-15804)

  - glibc: realpath() buffer underflow when getcwd() returns relative path allows privilege escalation     (CVE-2018-1000001)

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

This update for glibc fixes the following issues: Security issues :

  - CVE-2017-8804: Fix memory leak after deserialization     failure in xdr_bytes, xdr_string (bsc#1037930)

  - CVE-2017-12132: Reduce EDNS payload size to 1200 bytes     (bsc#1051791)

  - CVE-2018-6485,CVE-2018-6551: Fix integer overflows in     internal memalign and malloc functions (bsc#1079036)

  - CVE-2018-1000001: Avoid underflow of malloced area in     realpath (bsc#1074293) Also a non security issue was     fixed :

  - Do not fail if one of the two responses to AF_UNSPEC     fails (bsc#978209)

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.

This update for glibc fixes the following issues :

Security issues fixed :

  - CVE-2017-8804: Fix memory leak after deserialization     failure in xdr_bytes, xdr_string (bsc#1037930)

  - CVE-2017-12132: Reduce EDNS payload size to 1200 bytes     (bsc#1051791)

  - CVE-2018-6485,CVE-2018-6551: Fix integer overflows in     internal memalign and malloc functions (bsc#1079036)

  - CVE-2018-1000001: Avoid underflow of malloced area     (bsc#1074293)

Non security bugs fixed :

  - Release read lock after resetting timeout (bsc#1073990)

This update was imported from the SUSE:SLE-12-SP2:Update update project.

This update for glibc fixes the following issues: Security issues fixed :

  - CVE-2017-8804: Fix memory leak after deserialization     failure in xdr_bytes, xdr_string (bsc#1037930)

  - CVE-2017-12132: Reduce EDNS payload size to 1200 bytes     (bsc#1051791)

  - CVE-2018-6485,CVE-2018-6551: Fix integer overflows in     internal memalign and malloc functions (bsc#1079036)

  - CVE-2018-1000001: Avoid underflow of malloced area     (bsc#1074293) Non security bugs fixed :

  - Release read lock after resetting timeout (bsc#1073990)

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.

This update improves compatibility with legacy 32-bit i386 applications (RHBZ#1471427) and addresses a minor security vulnerability in the DNS stub resolver (CVE-2017-12132).

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

ID	Name	Product	Family	Severity
220176	Linux Distros Unpatched Vulnerability : CVE-2017-12132	Nessus	Misc.	medium
168533	Ubuntu 16.04 ESM : GNU C Library vulnerabilities (USN-5768-1)	Nessus	Ubuntu Local Security Checks	medium
129223	EulerOS 2.0 SP3 : glibc (EulerOS-SA-2019-2030)	Nessus	Huawei Local Security Checks	critical
128896	EulerOS 2.0 SP2 : glibc (EulerOS-SA-2019-1844)	Nessus	Huawei Local Security Checks	medium
127183	NewStart CGSL CORE 5.04 / MAIN 5.04 : glibc Multiple Vulnerabilities (NS-SA-2019-0024)	Nessus	NewStart CGSL Local Security Checks	critical
125004	EulerOS Virtualization 3.0.1.0 : glibc (EulerOS-SA-2019-1551)	Nessus	Huawei Local Security Checks	critical
111547	SUSE SLES12 Security Update : glibc (SUSE-SU-2018:2187-1)	Nessus	SuSE Local Security Checks	critical
111546	SUSE SLES12 Security Update : glibc (SUSE-SU-2018:2185-1)	Nessus	SuSE Local Security Checks	critical
109699	Amazon Linux AMI : glibc (ALAS-2018-1017)	Nessus	Amazon Linux Local Security Checks	critical
109447	Scientific Linux Security Update : glibc on SL7.x x86_64 (20180410)	Nessus	Scientific Linux Local Security Checks	critical
109371	CentOS 7 : glibc (CESA-2018:0805)	Nessus	CentOS Local Security Checks	critical
109105	Oracle Linux 7 : glibc (ELSA-2018-0805)	Nessus	Oracle Linux Local Security Checks	critical
108985	RHEL 7 : glibc (RHSA-2018:0805)	Nessus	Red Hat Local Security Checks	critical
107086	SUSE SLES11 Security Update : glibc (SUSE-SU-2018:0565-1)	Nessus	SuSE Local Security Checks	critical
106916	openSUSE Security Update : glibc (openSUSE-2018-184)	Nessus	SuSE Local Security Checks	critical
106865	SUSE SLED12 / SLES12 Security Update : glibc (SUSE-SU-2018:0451-1)	Nessus	SuSE Local Security Checks	critical
102606	Fedora 26 : glibc (2017-92f8958310)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2017-12132

medium

Tenable Plugins

medium

medium

critical

medium

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

medium