eglibc - security update

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

• CVE-2012-3406
  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, a different
  vulnerability than
  
  CVE-2012-3404 and
  
  CVE-2012-3405.
• CVE-2013-7424
  An invalid free flaw was found in glibc’s getaddrinfo() function when used
  with the AI_IDN flag. A remote attacker able to make an application call
  this function could use this flaw to execute arbitrary code with the
  permissions of the user running the application. Note that this flaw only
  affected applications using glibc compiled with libidn support.
• CVE-2014-4043
  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-2014-9402
  The getnetbyname function in glibc 2.21 or earlier will enter an infinite
  loop if the DNS backend is activated in the system Name Service Switch
  configuration, and the DNS resolver receives a positive answer while
  processing the network name.
• CVE-2015-1472 /
  CVE-2015-1473
  Under certain conditions wscanf can allocate too little memory for the
  to-be-scanned arguments and overflow the allocated buffer. 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.

For the stable distribution (wheezy), these issues are fixed in version
2.13-38+deb7u8 of the eglibc package.

For the unstable distribution (sid), all the above issues are fixed in version
2.19-15 of the glibc package.

We recommend that you upgrade your eglibc packages.