Debian: DSA-3169-1: eglibc security update
Summary
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 in 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 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.
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/
Mailing list: debian-security-announce@lists.debian.org
