RHSA-2013:1144: Moderate: nss, nss-util, nss-softokn, and nspr security update

Network Security Services (NSS) is a set of libraries designed to supportthe cross-platform development of security-enabled client and serverapplications. Netscape Portable Runtime (NSPR) provides platformindependence for non-GUI operating system facilities. nss-softokn providesan NSS softoken cryptographic module.It was discovered that NSS leaked timing information when decryptingTLS/SSL and DTLS protocol encrypted records when CBC-mode cipher suiteswere used. A remote attacker could possibly use this flaw to retrieve plaintext from the encrypted packets by using a TLS/SSL or DTLS server as apadding oracle. (CVE-2013-1620)An out-of-bounds memory read flaw was found in the way NSS decoded certaincertificates. 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 reportingCVE-2013-0791. Upstream acknowledges Ambroz Bizjak as the original reporterof CVE-2013-0791.This update also fixes the following bugs: The RHBA-2013:0445 update (which upgraded NSS to version 3.14) prevented the use of certificates that have an MD5 signature. This caused problems incertain environments. With this update, certificates that have an MD5signature are once again allowed. To prevent the use of certificates thathave an MD5 signature, set the "NSSHASHALGSUPPORT" environment variableto "-MD5". (BZ#957603) Previously, the sechash.h header file was missing, preventing certain source RPMs (such as firefox and xulrunner) from building. (BZ#948715) A memory leak in the nssutilReadSecmodDB() function has been fixed. (BZ#984967)In addition, the nss package has been upgraded to upstream version 3.14.3,the nss-util package has been upgraded to upstream version 3.14.3, thenss-softokn package has been upgraded to upstream version 3.14.3, and thenspr package has been upgraded to upstream version 4.9.5. These updatesprovide a number of bug fixes and enhancements over the previous versions.(BZ#927157, BZ#927171, BZ#927158, BZ#927186)Users of NSS, NSPR, nss-util, and nss-softokn are advised to upgrade tothese updated packages, which fix these issues and add these enhancements.After installing this update, applications using NSS, NSPR, nss-util, ornss-softokn must be restarted for this update to take effect.