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Category:Red Hat Local Security Checks
Title:RedHat Update for glibc RHSA-2015:0863-01
Summary:The remote host is missing an update for the 'glibc'; package(s) announced via the referenced advisory.
The remote host is missing an update for the 'glibc'
package(s) announced via the referenced advisory.

Vulnerability Insight:
The glibc packages provide the standard C libraries (libc), POSIX thread
libraries (libpthread), standard math libraries (libm), and the Name
Server Caching Daemon (nscd) used by multiple programs on the system.
Without these libraries, the Linux system cannot function correctly.

A buffer overflow flaw was found in the way glibc's gethostbyname_r() and
other related functions computed the size of a buffer when passed a
misaligned buffer as input. An attacker able to make an application call
any of these functions with a misaligned buffer could use this flaw to
crash the application or, potentially, execute arbitrary code with the
permissions of the user running the application. (CVE-2015-1781)

It was discovered that, under certain circumstances, glibc's getaddrinfo()
function would send DNS queries to random file descriptors. An attacker
could potentially use this flaw to send DNS queries to unintended
recipients, resulting in information disclosure or data loss due to the
application encountering corrupted data. (CVE-2013-7423)

The CVE-2015-1781 issue was discovered by Arjun Shankar of Red Hat.

This update also fixes the following bug:

* Previously, the nscd daemon did not properly reload modified data when
the user edited monitored nscd configuration files. As a consequence, nscd
returned stale data to system processes. This update adds a system of
inotify-based monitoring and stat-based backup monitoring for nscd
configuration files. As a result, nscd now detects changes to its
configuration files and reloads the data properly, which prevents it from
returning stale data. (BZ#1194149)

All glibc users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues.

Affected Software/OS:
glibc on Red Hat Enterprise Linux Desktop (v. 6),
Red Hat Enterprise Linux Server (v. 6),
Red Hat Enterprise Linux Workstation (v. 6)

Please Install the Updated Packages.

CVSS Score:

CVSS Vector:

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2013-7423
BugTraq ID: 72844
RedHat Security Advisories: RHSA-2015:0863
RedHat Security Advisories: RHSA-2016:1207
SuSE Security Announcement: openSUSE-SU-2015:0351 (Google Search)
Common Vulnerability Exposure (CVE) ID: CVE-2015-1781
BugTraq ID: 74255
Debian Security Information: DSA-3480 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1424 (Google Search)
SuSE Security Announcement: SUSE-SU-2016:0470 (Google Search)
CopyrightCopyright (C) 2015 Greenbone Networks GmbH

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