[IT-SecNots] [SECURITY] [DSA 3169-1] eglibc security update

[Aurelien Jarno <aurel32 AT debian.org>]

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Debian Security Advisory DSA-3169-1                security AT debian.org
http://www.debian.org/security/                         Aurelien Jarno
February 23, 2015                   http://www.debian.org/security/faq
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Package        : eglibc
CVE ID         : CVE-2012-3406 CVE-2013-7424 CVE-2014-4043 CVE-2014-9402
                 CVE-2015-1472 CVE-2015-1473
Debian Bug     : 681888 751774 775572 777197

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 AT lists.debian.org
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