RHEL 7 : glibc (RHSA-2015:2589)

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 multiple security issues are now
available for Red Hat Enterprise Linux 7.1 Extended Update Support.

Red Hat Product Security has rated this update as having Important
security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links 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.

It was discovered that the nss_files backend for the Name Service
Switch in glibc would return incorrect data to applications or corrupt
the heap (depending on adjacent heap contents). A local attacker could
potentially use this flaw to execute arbitrary code on the system.
(CVE-2015-5277)

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)

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)

A heap-based buffer overflow flaw and a stack overflow flaw were found
in glibc's swscanf() function. An attacker able to make an application
call the swscanf() function could use these flaws to crash that
application or, potentially, execute arbitrary code with the
permissions of the user running the application. (CVE-2015-1472,
CVE-2015-1473)

The CVE-2015-5277 issue was discovered by Sumit Bose and Lukas
Slebodnik of Red Hat, and the CVE-2015-1781 issue was discovered by
Arjun Shankar of Red Hat.

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

See also :

https://www.redhat.com/security/data/cve/CVE-2013-7423.html
https://www.redhat.com/security/data/cve/CVE-2015-1472.html
https://www.redhat.com/security/data/cve/CVE-2015-1473.html
https://www.redhat.com/security/data/cve/CVE-2015-1781.html
https://www.redhat.com/security/data/cve/CVE-2015-5277.html
http://rhn.redhat.com/errata/RHSA-2015-2589.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 5.9
(CVSS2#E:POC/RL:OF/RC:ND)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 88573 ()

Bugtraq ID:

CVE ID: CVE-2013-7423
CVE-2015-1472
CVE-2015-1473
CVE-2015-1781
CVE-2015-5277

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