Scientific Linux Security Update : nss and nspr on SL5.x i386/x86_64

Medium Nessus Plugin ID 69223


The remote Scientific Linux host is missing one or more security updates.


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)

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.

- A memory leak in the nssutil_ReadSecmodDB() function has been fixed.

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.

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'.

After installing this update, applications using NSS or NSPR must be restarted for this update to take effect.


Update the affected packages.

See Also

Plugin Details

Severity: Medium

ID: 69223

File Name: sl_20130805_nss_and_nspr_on_SL5_x.nasl

Version: $Revision: 1.1 $

Type: local

Agent: unix

Published: 2013/08/06

Modified: 2013/08/06

Dependencies: 12634

Risk Information

Risk Factor: Medium


Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Vulnerability Information

CPE: x-cpe:/o:fermilab:scientific_linux

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RedHat/release, Host/RedHat/rpm-list

Patch Publication Date: 2013/08/05

Reference Information

CVE: CVE-2013-0791, CVE-2013-1620