Rapid7 Vulnerability & Exploit Database

RHSA-2014:1948: nss, nss-util, and nss-softokn security, bug fix, and enhancement update

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RHSA-2014:1948: nss, nss-util, and nss-softokn security, bug fix, and enhancement 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.This update adds support for the TLS Fallback Signaling Cipher Suite Value(TLS_FALLBACK_SCSV), which can be used to prevent protocol downgradeattacks against applications which re-connect using a lower SSL/TLSprotocol version when the initial connection indicating the highestsupported protocol version fails.This can prevent a forceful downgrade of the communication to SSL 3.0.The SSL 3.0 protocol was found to be vulnerable to the padding oracleattack when using block cipher suites in cipher block chaining (CBC) mode.This issue is identified as CVE-2014-3566, and also known under the aliasPOODLE. This SSL 3.0 protocol flaw will not be addressed in a futureupdate; it is recommended that users configure their applications torequire at least TLS protocol version 1.0 for secure communication.For additional information about this flaw, see the Knowledgebase articleat https://access.redhat.com/articles/1232123The nss, nss-util, and nss-softokn packages have been upgraded to upstreamversion, which provides a number of bug fixes and enhancementsover the previous version, and adds the support for Mozilla Firefox 31.3.(BZ#1158159, BZ#1165003, BZ#1165525)Users of nss, nss-util, and nss-softokn are advised to upgrade to theseupdated packages, which contain a backported patch to mitigate theCVE-2014-3566 issue, fix these bugs, and add these enhancements. Afterinstalling this update, applications using NSS or NSPR must be restartedfor this update to take effect.


  • redhat-upgrade-nss
  • redhat-upgrade-nss-debuginfo
  • redhat-upgrade-nss-devel
  • redhat-upgrade-nss-pkcs11-devel
  • redhat-upgrade-nss-softokn
  • redhat-upgrade-nss-softokn-debuginfo
  • redhat-upgrade-nss-softokn-devel
  • redhat-upgrade-nss-softokn-freebl
  • redhat-upgrade-nss-softokn-freebl-devel
  • redhat-upgrade-nss-sysinit
  • redhat-upgrade-nss-tools
  • redhat-upgrade-nss-util
  • redhat-upgrade-nss-util-debuginfo
  • redhat-upgrade-nss-util-devel

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