RHEL 6 / 7 : glibc (RHSA-2016:0225)

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


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated glibc packages that fix one security issue are now available
for Red Hat Enterprise Linux 6.2, 6.4, and 6.5 Advanced Update
Support, and Red Hat Enterprise Linux 6.6 and 7.1 Extended Update
Support.

Red Hat Product Security has rated this update as having Critical
security impact. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available from the
CVE link in the References section.

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 stack-based buffer overflow was found in the way the libresolv
library performed dual A/AAAA DNS queries. A remote attacker could
create a specially crafted DNS response which could cause libresolv to
crash or, potentially, execute code with the permissions of the user
running the library. Note: this issue is only exposed when libresolv
is called from the nss_dns NSS service module. (CVE-2015-7547)

This issue was discovered by the Google Security Team and Red Hat.

All glibc users are advised to upgrade to these updated packages,
which contain a backported patch to correct this issue.

See also :

https://www.redhat.com/security/data/cve/CVE-2015-7547.html
https://access.redhat.com/articles/2161461
http://rhn.redhat.com/errata/RHSA-2016-0225.html
https://www.tenable.com/security/research/tra-2017-08

Solution :

Update the affected packages.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 8.3
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 88793 ()

Bugtraq ID:

CVE ID: CVE-2015-7547

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