GLSA-201602-02 : GNU C Library: Multiple vulnerabilities

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

The remote Gentoo host is missing one or more security-related
patches.

Description :

The remote host is affected by the vulnerability described in GLSA-201602-02
(GNU C Library: Multiple vulnerabilities)

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.

See also :

http://www.nessus.org/u?1358552a
https://security.gentoo.org/glsa/201602-02
https://www.tenable.com/security/research/tra-2017-08

Solution :

All GNU C Library users should upgrade to the latest version:
# 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.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)

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