CVE-2014-9402

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.

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)

These are all security issues fixed in the glibc-2.24-2.3 package on the GA media of openSUSE Tumbleweed.

This glibc update fixes a critical privilege escalation problem and two 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#892065: setenv-alloca.patch: Avoid unbound alloca in setenv.
* bnc#888347: printf-multibyte-format.patch: Don't parse %s format
  argument as multi-byte string.

Security Issues:

* CVE-2014-5119
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-5119>

This glibc update fixes a critical privilege escalation problem and two 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#892065: setenv-alloca.patch: Avoid unbound alloca in setenv.
* bnc#888347: printf-multibyte-format.patch: Don't parse %s format
  argument as multi-byte string.

Security Issues:

* CVE-2014-5119
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-5119>

This glibc update fixes a critical privilege escalation problem and two 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#892065: setenv-alloca.patch: Avoid unbound alloca in setenv.
* bnc#888347: printf-multibyte-format.patch: Don't parse %s format
  argument as multi-byte string.

Security Issues:

* CVE-2014-5119
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-5119>

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).

These non-security issues were fixed:

• Fix infinite loop in check_pf (bsc#909053)
• Restore warning about execution permission, it is still needed for noexec mounts (bsc#915985).
• Don't touch user-controlled stdio locks in forked child (bsc#864081)
• Don't use gcc extensions for non-gcc compilers (bsc#905313)

This update for glibc contains the following fixes:

* Fix integer overflows in malloc (CVE-2013-4332, bnc#839870)
* Fix buffer overflow in glob (bnc#691365)
* Fix buffer overflow in strcoll (CVE-2012-4412, bnc#779320)
* Update mount flags in <sys/mount.h> (bnc#791928)
* Fix buffer overrun in regexp matcher (CVE-2013-0242, bnc#801246)
* Fix memory leaks in dlopen (bnc#811979)
* Fix stack overflow in getaddrinfo with many results (CVE-2013-1914,
  bnc#813121)
* Fix check for XEN build in glibc_post_upgrade that causes missing
  init re-exec (bnc#818628)
* Don't raise UNDERFLOW in tan/tanf for small but normal argument
  (bnc#819347)
* Properly cross page boundary in SSE4.2 implementation of strcmp
  (bnc#822210)
* Fix robust mutex handling after fork (bnc#827811)
* Fix missing character in IBM-943 charset (bnc#828235)
* Fix use of alloca in gaih_inet (bnc#828637)
* Initialize pointer guard also in static executables (CVE-2013-4788,
  bnc#830268)
* Fix readdir_r with long file names (CVE-2013-4237, bnc#834594).

Security Issues:

* CVE-2012-4412
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-4412>
* CVE-2013-0242
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-0242>
* CVE-2013-1914
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-1914>
* CVE-2013-4237
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4237>
* CVE-2013-4332
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4332>
* CVE-2013-4788
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4788>

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.

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)