Several vulnerabilities have been fixed in the GNU C Library, eglibc.

The CVE-2015-7547 vulnerability listed below is considered to have critical impact.

  - CVE-2014-8121     Robin Hack discovered that the nss_files database did     not correctly implement enumeration interleaved with     name-based or ID-based lookups. This could cause the     enumeration enter an endless loop, leading to a denial     of service.

  - CVE-2015-1781     Arjun Shankar discovered that the _r variants of host     name resolution functions (like gethostbyname_r), when     performing DNS name resolution, suffered from a buffer     overflow if a misaligned buffer was supplied by the     applications, leading to a crash or, potentially,     arbitrary code execution. Most applications are not     affected by this vulnerability because they use aligned     buffers.

  - CVE-2015-7547     The Google Security Team and Red Hat discovered that the     eglibc host name resolver function, getaddrinfo, when     processing AF_UNSPEC queries (for dual A/AAAA lookups),     could mismanage its internal buffers, leading to a     stack-based buffer overflow and arbitrary code     execution. This vulnerability affects most applications     which perform host name resolution using getaddrinfo,     including system services.

  - CVE-2015-8776     Adam Nielsen discovered that if an invalid separated     time value is passed to strftime, the strftime function     could crash or leak information. Applications normally     pass only valid time information to strftime; no     affected applications are known.

  - CVE-2015-8777     Hector Marco-Gisbert reported that LD_POINTER_GUARD was     not ignored for SUID programs, enabling an unintended     bypass of a security feature. This update causes eglibc     to always ignore the LD_POINTER_GUARD environment     variable.

  - CVE-2015-8778     Szabolcs Nagy reported that the rarely-used hcreate and     hcreate_r functions did not check the size argument     properly, leading to a crash (denial of service) for     certain arguments. No impacted applications are known at     this time.

  - CVE-2015-8779     The catopen function contains several unbound stack     allocations (stack overflows), causing it the crash the     process (denial of service). No applications where this     issue has a security impact are currently known.

The following fixed vulnerabilities currently lack CVE assignment :

  - Joseph Myers reported that an integer overflow in the     strxfrm can lead to heap-based buffer overflow, possibly     allowing arbitrary code execution. In addition, a     fallback path in strxfrm uses an unbounded stack     allocation (stack overflow), leading to a crash or     erroneous application behavior.
  - Kostya Serebryany reported that the fnmatch function     could skip over the terminating NUL character of a     malformed pattern, causing an application calling     fnmatch to crash (denial of service).

  - Joseph Myers reported that the IO_wstr_overflow     function, internally used by wide-oriented character     streams, suffered from an integer overflow, leading to a     heap-based buffer overflow. On GNU/Linux systems,     wide-oriented character streams are rarely used, and no     affected applications are known.

  - Andreas Schwab reported a memory leak (memory allocation     without a matching deallocation) while processing     certain DNS answers in getaddrinfo, related to the
    _nss_dns_gethostbyname4_r function. This vulnerability     could lead to a denial of service.

While it is only necessary to ensure that all processes are not using the old eglibc anymore, it is recommended to reboot the machines after applying the security upgrade.

This update for glibc fixes the following issues :

  - CVE-2015-7547: A stack-based buffer overflow in     getaddrinfo allowed remote attackers to cause a crash or     execute arbitrary code via crafted and timed DNS     responses (bsc#961721)

  - CVE-2015-8777: Insufficient checking of LD_POINTER_GUARD     environment variable allowed local attackers to bypass     the pointer guarding protection of the dynamic loader on     set-user-ID and set-group-ID programs (bsc#950944)

  - CVE-2015-8776: Out-of-range time values passed to the     strftime function may cause it to crash, leading to a     denial of service, or potentially disclosure information     (bsc#962736)

  - CVE-2015-8778: Integer overflow in hcreate and hcreate_r     could have caused an out-of-bound memory access. leading     to application crashes or, potentially, arbitrary code     execution (bsc#962737)

  - CVE-2014-9761: A stack overflow (unbounded alloca) could     have caused applications which process long strings with     the nan function to crash or, potentially, execute     arbitrary code. (bsc#962738)

  - CVE-2015-8779: A stack overflow (unbounded alloca) in     the catopen function could have caused applications     which pass long strings to the catopen function to crash     or, potentially execute arbitrary code. (bsc#962739)

  - CVE-2013-2207: pt_chown tricked into granting access to     another users pseudo-terminal (bsc#830257)

  - CVE-2013-4458: Stack (frame) overflow in getaddrinfo()     when called with AF_INET6 (bsc#847227)

  - CVE-2014-8121: denial of service issue in the NSS     backends (bsc#918187)

  - bsc#920338: Read past end of pattern in fnmatch

  - CVE-2015-1781: buffer overflow in nss_dns (bsc#927080)

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.

This update for glibc fixes the following security issues :

  - CVE-2015-7547: A stack-based buffer overflow in     getaddrinfo allowed remote attackers to cause a crash or     execute arbitrary code via crafted and timed DNS     responses (bsc#961721)

  - CVE-2015-8777: Insufficient checking of LD_POINTER_GUARD     environment variable allowed local attackers to bypass     the pointer guarding protection of the dynamic loader on     set-user-ID and set-group-ID programs (bsc#950944)

  - CVE-2015-8776: Out-of-range time values passed to the     strftime function may cause it to crash, leading to a     denial of service, or potentially disclosure information     (bsc#962736)

  - CVE-2015-8778: Integer overflow in hcreate and hcreate_r     could have caused an out-of-bound memory access. leading     to application crashes or, potentially, arbitrary code     execution (bsc#962737)

  - CVE-2014-9761: A stack overflow (unbounded alloca) could     have caused applications which process long strings with     the nan function to crash or, potentially, execute     arbitrary code. (bsc#962738)

  - CVE-2015-8779: A stack overflow (unbounded alloca) in     the catopen function could have caused applications     which pass long strings to the catopen function to crash     or, potentially execute arbitrary code. (bsc#962739)

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.

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

  - 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)

  - 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)

  - 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 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)

  - 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)

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 Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2017:0680 advisory.

    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):

    * 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)

    * 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)

    * 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 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)

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.9 Release Notes     and Red Hat Enterprise Linux 6.9 Technical Notes linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 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	名称	产品	系列	发布时间	最近更新时间	严重程度
88767	Debian DSA-3480-1 : eglibc - security update	Nessus	Debian Local Security Checks	2016/2/17	2024/6/18	critical
88831	SUSE SLES11 Security Update : glibc (SUSE-SU-2016:0470-1)	Nessus	SuSE Local Security Checks	2016/2/18	2024/6/18	critical
88832	SUSE SLED12 / SLES12 Security Update : glibc (SUSE-SU-2016:0471-1)	Nessus	SuSE Local Security Checks	2016/2/18	2024/6/18	critical
103057	EulerOS 2.0 SP1 : glibc (EulerOS-SA-2017-1199)	Nessus	Huawei Local Security Checks	2017/9/11	2025/11/24	critical
97881	RHEL 6 : glibc (RHSA-2017:0680)	Nessus	Red Hat Local Security Checks	2017/3/22	2025/12/29	critical
88822	GLSA-201602-02 : GNU C Library: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2016/2/18	2024/6/18	critical

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