Updated glibc packages fix security vulnerabilities :

Stephane Chazelas discovered that directory traversal issue in locale handling in glibc. glibc accepts relative paths with .. components in the LC_* and LANG variables. Together with typical OpenSSH configurations (with suitable AcceptEnv settings in sshd_config), this could conceivably be used to bypass ForceCommand restrictions (or restricted shells), assuming the attacker has sufficient level of access to a file system location on the host to create crafted locale definitions there (CVE-2014-0475).

David Reid, Glyph Lefkowitz, and Alex Gaynor discovered a bug where posix_spawn_file_actions_addopen fails to copy the path argument (glibc bz #17048) which can, in conjunction with many common memory management techniques from an application, lead to a use after free, or other vulnerabilities (CVE-2014-4043).

This update also fixes the following issues: x86: Disable x87 inline functions for SSE2 math (glibc bz #16510) malloc: Fix race in free() of fastbin chunk (glibc bz #15073)

Tavis Ormandy discovered a heap-based buffer overflow in the transliteration module loading code. As a result, an attacker who can supply a crafted destination character set argument to iconv-related character conversation functions could achieve arbitrary code execution.

This update removes support of loadable gconv transliteration modules.
Besides the security vulnerability, the module loading code had functionality defects which prevented it from working for the intended purpose (CVE-2014-5119).

Adhemerval Zanella Netto discovered out-of-bounds reads in additional code page decoding functions (IBM933, IBM935, IBM937, IBM939, IBM1364) that can be used to crash the systems, causing a denial of service conditions (CVE-2014-6040).

The function wordexp() fails to properly handle the WRDE_NOCMD flag when processing arithmetic inputs in the form of '$((... ))' where '...' can be anything valid. The backticks in the arithmetic epxression are evaluated by in a shell even if WRDE_NOCMD forbade command substitution. This allows an attacker to attempt to pass dangerous commands via constructs of the above form, and bypass the WRDE_NOCMD flag. This update fixes the issue (CVE-2014-7817).

The vfprintf function in stdio-common/vfprintf.c in GNU C Library (aka glibc) 2.5, 2.12, and probably other versions does not properly restrict the use of the alloca function when allocating the SPECS array, 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 using positional parameters and a large number of format specifiers (CVE-2012-3406).

The nss_dns implementation of getnetbyname could run into an infinite loop if the DNS response contained a PTR record of an unexpected format (CVE-2014-9402).

Also glibc lock elision (new feature in glibc 2.18) has been disabled as it can break glibc at runtime on newer Intel hardware (due to hardware bug)

Under certain conditions wscanf can allocate too little memory for the to-be-scanned arguments and overflow the allocated buffer (CVE-2015-1472).

The incorrect use of '__libc_use_alloca (newsize)' caused a different (and weaker) policy to be enforced which could allow a denial of service attack (CVE-2015-1473).

This glibc update fixes a critical privilege escalation problem and the following security and non-security issues :

  - bnc#892073: An off-by-one error leading to a heap-based     buffer overflow was found in __gconv_translit_find(). An     exploit that targets the problem is publicly available.
    (CVE-2014-5119)

  - bnc#882600: Copy filename argument in     posix_spawn_file_actions_addopen. (CVE-2014-4043)

  - bnc#860501: Use O_LARGEFILE for utmp file.

  - bnc#842291: Fix typo in     glibc-2.5-dlopen-lookup-race.diff.

  - bnc#839870: Fix integer overflows in malloc.
    (CVE-2013-4332)

  - bnc#834594: Fix readdir_r with long file names.
    (CVE-2013-4237)

  - bnc#824639: Drop lock before calling malloc_printerr.

  - bnc#801246: Fix buffer overrun in regexp matcher.
    (CVE-2013-0242)

  - bnc#779320: Fix buffer overflow in strcoll.
    (CVE-2012-4412)

  - bnc#894556 / bnc#894553: Fix crashes on invalid input in     IBM gconv modules. (CVE-2014-6040, CVE-2012-6656,     bnc#894553, bnc#894556, BZ#17325, BZ#14134)

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 glibc update fixes a critical privilege escalation problem and two additional issues :

  - bnc#892073: An off-by-one error leading to a heap-based     buffer overflow was found in __gconv_translit_find(). An     exploit that targets the problem is publicly available.
    (CVE-2014-5119)

  - bnc#836746: Avoid race between {, __de}allocate_stack     and __reclaim_stacks during fork.

  - bnc#844309: Fixed various overflows, reading large     /etc/hosts or long names. (CVE-2013-4357)

  - bnc#894553, bnc#894556: Fixed various crashes on invalid     input in IBM gconv modules. (CVE-2014-6040,     CVE-2012-6656)

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.

GNU C Library (aka glibc) before 2.20 allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) via a multibyte character value of '0xffff' to the iconv function when converting (1) IBM933, (2) IBM935, (3) IBM937, (4) IBM939, or (5) IBM1364 encoded data to UTF-8.

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.

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

  - GNU C Library (aka glibc) before 2.20 allows context-dependent attackers to cause a denial of service     (out-of-bounds read and crash) via a multibyte character value of 0xffff to the iconv function when     converting (1) IBM933, (2) IBM935, (3) IBM937, (4) IBM939, or (5) IBM1364 encoded data to UTF-8.
    (CVE-2014-6040)

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

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2015-0016 advisory.

    - Fix crashes on invalid input in IBM gconv modules (CVE-2014-6040, #1139571).

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

  - Fix recursive dlopen (#1173469).

  - Fix typo in res_send and res_query (#rh1172023).

  - Fix crashes on invalid input in IBM gconv modules     (CVE-2014-6040, #1139571).

  - Fix wordexp to honour WRDE_NOCMD (CVE-2014-7817,     #1170121).

glibc has been updated to fix security issues and bugs :

  - Fix crashes on invalid input in IBM gconv modules.
    (CVE-2014-6040 / CVE-2012-6656, bsc#894553, bsc#894556,     GLIBC BZ #17325, GLIBC BZ #14134)

  - Avoid infinite loop in nss_dns getnetbyname.
    (CVE-2014-9402)

  - Don't touch user-controlled stdio locks in forked child.
    (bsc#864081, GLIBC BZ #12847)

  - Unlock mutex before going back to waiting for PI     mutexes. (bsc#891843, GLIBC BZ #14417)

  - Implement x86 cpuid handling of leaf4 for cache     information. (bsc#903288, GLIBC BZ #12587)

  - Fix infinite loop in check_pf. (bsc#909053, GLIBC BZ     #12926)

Updated glibc packages that fix two security issues and several bugs 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.

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)

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)

This update also fixes the following bugs :

* Due to problems with buffer extension and reallocation, the nscd daemon terminated unexpectedly with a segmentation fault when processing long netgroup entries. With this update, the handling of long netgroup entries has been corrected and nscd no longer crashes in the described scenario. (BZ#1138520)

* If a file opened in append mode was truncated with the ftruncate() function, a subsequent ftell() call could incorrectly modify the file offset. This update ensures that ftell() modifies the stream state only when it is in append mode and the buffer for the stream is not empty. (BZ#1156331)

* A defect in the C library headers caused builds with older compilers to generate incorrect code for the btowc() function in the older compatibility C++ standard library. Applications calling btowc() in the compatibility C++ standard library became unresponsive. With this update, the C library headers have been corrected, and the compatibility C++ standard library shipped with Red Hat Enterprise Linux has been rebuilt. Applications that rely on the compatibility C++ standard library no longer hang when calling btowc(). (BZ#1120490)

* Previously, when using netgroups and the nscd daemon was set up to cache netgroup information, the sudo utility denied access to valid users. The bug in nscd has been fixed, and sudo now works in netgroups as expected. (BZ#1080766)

Users of glibc are advised to upgrade to these updated packages, which fix these issues.

CVE-2012-6656

Fix validation check when converting from ibm930 to utf. When converting IBM930 code with iconv(), if IBM930 code which includes invalid multibyte character '0xffff' is specified, then iconv() segfaults.

CVE-2014-6040

Crashes on invalid input in IBM gconv modules [BZ #17325] These changes are based on the fix for BZ #14134 in commit 6e230d11837f3ae7b375ea69d7905f0d18eb79e5.

CVE-2014-7817

The function wordexp() fails to properly handle the WRDE_NOCMD flag when processing arithmetic inputs in the form of '$((... ``))' where '...' can be anything valid. The backticks in the arithmetic epxression are evaluated by in a shell even if WRDE_NOCMD forbade command substitution. This allows an attacker to attempt to pass dangerous commands via constructs of the above form, and bypass the WRDE_NOCMD flag. This patch fixes this by checking for WRDE_NOCMD in exec_comm(), the only place that can execute a shell. All other checks for WRDE_NOCMD are superfluous and removed.

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 been updated to fix security issues :

  - Fix crashes on invalid input in IBM gconv modules     (CVE-2014-6040, CVE-2012-6656, bsc#894553, bsc#894556,     GLIBC BZ #17325, GLIBC BZ #14134)

  - Fixed a stack overflow during hosts parsing     (CVE-2013-4357)

  - Copy filename argument in     posix_spawn_file_actions_addopen (CVE-2014-4043,     bsc#882600, BZ #17048)

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 was updated to fix three security issues :

  - A directory traversal in locale environment handling was     fixed (CVE-2014-0475, bnc#887022, GLIBC BZ #17137)

  - Disable gconv transliteration module loading which could     be used for code execution (CVE-2014-5119, bnc#892073,     GLIBC BZ #17187)

  - Fix crashes on invalid input in IBM gconv modules     (CVE-2014-6040, bnc#894553, BZ #17325)

The remote Ubuntu 14.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-2432-1 advisory.

    Siddhesh Poyarekar discovered that the GNU C Library incorrectly handled certain multibyte characters when     using the iconv function. An attacker could possibly use this issue to cause applications to crash,     resulting in a denial of service. This issue only affected Ubuntu 10.04 LTS and Ubuntu 12.04 LTS.
    (CVE-2012-6656)

    Adhemerval Zanella Netto discovered that the GNU C Library incorrectly handled certain multibyte     characters when using the iconv function. An attacker could possibly use this issue to cause applications     to crash, resulting in a denial of service. (CVE-2014-6040)

    Tim Waugh discovered that the GNU C Library incorrectly enforced the WRDE_NOCMD flag when handling the     wordexp function. An attacker could possibly use this issue to execute arbitrary commands. (CVE-2014-7817)

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.

- Fix CVE-2014-6040: crash in code page decoding functions     (IBM933, IBM935, IBM937, IBM939, IBM1364)

  - Fix CVE-2014-7817: command execution in wordexp() with     WRDE_NOCMD specified

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora 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 one security issue and several bugs :

Security issue fixed :

  - Fix crashes on invalid input in IBM gconv modules     (CVE-2014-6040, CVE-2012-6656)

  - Fixed a stack overflow during hosts parsing     (CVE-2013-4357)

Bugs fixed :

  - don't touch user-controlled stdio locks in forked child     (bsc#864081, GLIBC BZ #12847)

  - Fix infinite loop in check_pf (bsc#909053, GLIBC BZ     #12926)

  - Add check for RTLD_DEEPBIND environment variable to     disable deepbinding of NSS modules (bsc#888860)

  - Fix infinite loop in check_pf (bsc#909053, GLIBC BZ     #12926)

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.

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

  - CVE-2015-0235     Qualys discovered that the gethostbyname and     gethostbyname2 functions were subject to a buffer     overflow if provided with a crafted IP address argument.
    This could be used by an attacker to execute arbitrary     code in processes which called the affected functions.

  The original glibc bug was reported by Peter Klotz.

  - CVE-2014-7817     Tim Waugh of Red Hat discovered that the WRDE_NOCMD     option of the wordexp function did not suppress command     execution in all cases. This allows a context-dependent     attacker to execute shell commands.

  - CVE-2012-6656 CVE-2014-6040     The charset conversion code for certain IBM multi-byte     code pages could perform an out-of-bounds array access,     causing the process to crash. In some scenarios, this     allows a remote attacker to cause a persistent denial of     service.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
82421	Mandriva Linux Security Advisory : glibc (MDVSA-2015:168)	Nessus	Mandriva Local Security Checks	2015/3/30	2021/1/14	high
83638	SUSE SLES10 Security Update : glibc (SUSE-SU-2014:1128-1)	Nessus	SuSE Local Security Checks	2015/5/20	2021/1/19	high
83639	SUSE SLES11 Security Update : glibc (SUSE-SU-2014:1129-1)	Nessus	SuSE Local Security Checks	2015/5/20	2021/1/19	high
85963	F5 Networks BIG-IP : GNU C Library vulnerability (SOL16435)	Nessus	F5 Networks Local Security Checks	2015/9/17	2021/3/10	medium
125005	EulerOS Virtualization 3.0.1.0 : glibc (EulerOS-SA-2019-1552)	Nessus	Huawei Local Security Checks	2019/5/14	2021/1/6	critical
218358	Linux Distros Unpatched Vulnerability : CVE-2014-6040	Nessus	Misc.	2025/3/4	2026/1/28	high
80407	Oracle Linux 6 : glibc (ELSA-2015-0016)	Nessus	Oracle Linux Local Security Checks	2015/1/8	2024/10/22	high
80439	OracleVM 3.3 : glibc (OVMSA-2015-0003)	Nessus	OracleVM Local Security Checks	2015/1/9	2021/1/4	medium
81295	SuSE 11.3 Security Update : glibc (SAT Patch Number 10259)	Nessus	SuSE Local Security Checks	2015/2/11	2021/1/6	high
81889	CentOS 7 : glibc (CESA-2015:0327)	Nessus	CentOS Local Security Checks	2015/3/18	2021/1/4	medium
82242	Debian DLA-97-1 : eglibc security update	Nessus	Debian Local Security Checks	2015/3/26	2021/1/11	medium
83675	SUSE SLES10 Security Update : glibc (SUSE-SU-2015:0170-1)	Nessus	SuSE Local Security Checks	2015/5/20	2021/1/6	high
77659	openSUSE Security Update : glibc (openSUSE-SU-2014:1115-1)	Nessus	SuSE Local Security Checks	2014/9/12	2021/1/19	high
79718	Ubuntu 14.04 LTS : GNU C Library vulnerabilities (USN-2432-1)	Nessus	Ubuntu Local Security Checks	2014/12/4	2025/9/3	high
81616	Fedora 20 : glibc-2.18-19.fc20 (2015-2845)	Nessus	Fedora Local Security Checks	2015/3/5	2021/1/11	medium
83673	SUSE SLES11 Security Update : glibc (SUSE-SU-2015:0164-1)	Nessus	SuSE Local Security Checks	2015/5/20	2021/1/19	high
81029	Debian DSA-3142-1 : eglibc - security update	Nessus	Debian Local Security Checks	2015/1/28	2021/1/11	high

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