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PostPosted: Wed Feb 17, 2016 4:26 pm    Post subject: [ GLSA 201602-02 ] GNU C Library Reply with quote

Gentoo Linux Security Advisory

Title: GNU C Library: Multiple vulnerabilities (GLSA 201602-02)
Severity: high
Exploitable: local, remote
Date: February 17, 2016
Bug(s): #516884, #517082, #521932, #529982, #532874, #538090, #538814, #540070, #541246, #541542, #547296, #552692, #574880
ID: 201602-02

Synopsis

Multiple vulnerabilities have been found in the GNU C library, the
worst allowing for remote execution of arbitrary code.


Background

The GNU C library is the standard C library used by Gentoo Linux
systems.


Affected Packages

Package: sys-libs/glibc
Vulnerable: < 2.21-r2
Unaffected: >= 2.21-r2
Architectures: All supported architectures


Description

Multiple vulnerabilities have been discovered in the GNU C Library:
  • The Google Security Team and Red Hat discovered a stack-based buffer
    overflow in the send_dg() and send_vc() functions due to a buffer
    mismanagement when getaddrinfo() is called with AF_UNSPEC
    (CVE-2015-7547).
  • The strftime() function access invalid memory when passed
    out-of-range data, resulting in a crash (CVE-2015-8776).
  • An integer overflow was found in the __hcreate_r() function
    (CVE-2015-8778).
  • Multiple unbounded stack allocations were found in the catopen()
    function (CVE-2015-8779).
Please review the CVEs referenced below for additional vulnerabilities
that had already been fixed in previous versions of sys-libs/glibc, for
which we have not issued a GLSA before.


Impact

A remote attacker could exploit any application which performs host name
resolution using getaddrinfo() in order to execute arbitrary code or
crash the application. The other vulnerabilities can possibly be
exploited to cause a Denial of Service or leak information.


Workaround

A number of mitigating factors for CVE-2015-7547 have been identified.
Please review the upstream advisory and references below.


Resolution

All GNU C Library users should upgrade to the latest version:
Code:
# emerge --sync
      # emerge --ask --oneshot --verbose ">=sys-libs/glibc-2.21-r2"
   
It is important to ensure that no running process uses the old glibc
anymore. The easiest way to achieve that is by rebooting the machine
after updating the sys-libs/glibc package.
Note: Should you run into compilation failures while updating, please
see bug 574948.


References

CVE-2013-7423
CVE-2014-0475
CVE-2014-0475
CVE-2014-5119
CVE-2014-6040
CVE-2014-7817
CVE-2014-8121
CVE-2014-9402
CVE-2015-1472
CVE-2015-1781
CVE-2015-7547
CVE-2015-8776
CVE-2015-8778
CVE-2015-8779

Google Online Security Blog: "CVE-2015-7547: glibc getaddrinfo
stack-based buffer overflow"
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