CVE-2015-1472

The ADDW macro in stdio-common/vfscanf.c in the GNU C Library (aka glibc or libc6) before 2.21 does not properly consider data-type size during memory allocation, which allows context-dependent attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact via a long line containing wide characters that are improperly handled in a wscanf call.

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).

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 ADDW macro in stdio-common/vfscanf.c in the GNU C Library (aka glibc or libc6) before 2.21 does not properly consider data-type size during memory allocation, which allows context-dependent attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact via a long line containing wide characters that are improperly handled in a wscanf call.

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)