RHEL 5 : nss and nspr (RHSA-2013:1135)

This script is Copyright (C) 2013-2014 Tenable Network Security, Inc.


Synopsis :

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

Description :

Updated nss and nspr packages that fix two security issues, various
bugs, and add enhancements are now available for Red Hat Enterprise
Linux 5.

The Red Hat Security Response Team has rated this update as having
moderate 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.

Network Security Services (NSS) is a set of libraries designed to
support the cross-platform development of security-enabled client and
server applications. Netscape Portable Runtime (NSPR) provides
platform independence for non-GUI operating system facilities.

It was discovered that NSS leaked timing information when decrypting
TLS/SSL and DTLS protocol encrypted records when CBC-mode cipher
suites were used. A remote attacker could possibly use this flaw to
retrieve plain text from the encrypted packets by using a TLS/SSL or
DTLS server as a padding oracle. (CVE-2013-1620)

An out-of-bounds memory read flaw was found in the way NSS decoded
certain certificates. If an application using NSS decoded a malformed
certificate, it could cause the application to crash. (CVE-2013-0791)

Red Hat would like to thank the Mozilla project for reporting
CVE-2013-0791. Upstream acknowledges Ambroz Bizjak as the original
reporter of CVE-2013-0791.

This update also fixes the following bugs :

* A defect in the FreeBL library implementation of the Diffie-Hellman
(DH) protocol previously caused Openswan to drop connections.
(BZ#958023)

* A memory leak in the nssutil_ReadSecmodDB() function has been fixed.
(BZ#986969)

In addition, the nss package has been upgraded to upstream version
3.14.3, and the nspr package has been upgraded to upstream version
4.9.5. These updates provide a number of bug fixes and enhancements
over the previous versions. (BZ#949845, BZ#924741)

Note that while upstream NSS version 3.14 prevents the use of
certificates that have an MD5 signature, this erratum includes a patch
that allows such certificates by default. To prevent the use of
certificates that have an MD5 signature, set the
'NSS_HASH_ALG_SUPPORT' environment variable to '-MD5'.

Users of NSS and NSPR are advised to upgrade to these updated
packages, which fix these issues and add these enhancements. After
installing this update, applications using NSS or NSPR must be
restarted for this update to take effect.

See also :

https://www.redhat.com/security/data/cve/CVE-2013-0791.html
https://www.redhat.com/security/data/cve/CVE-2013-1620.html
http://rhn.redhat.com/errata/RHSA-2013-1135.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 4.3
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 69222 ()

Bugtraq ID: 57777
58826

CVE ID: CVE-2013-0791
CVE-2013-1620