RHSA-2016:0007: nss security update

Description

Network Security Services (NSS) is a set of libraries designed to supportthe cross-platform development of security-enabled client and serverapplications.A flaw was found in the way TLS 1.2 could use the MD5 hash function forsigning ServerKeyExchange and Client Authentication packets during a TLShandshake. A man-in-the-middle attacker able to force a TLS connection touse the MD5 hash function could use this flaw to conduct collision attacksto impersonate a TLS server or an authenticated TLS client. (CVE-2015-7575)All nss users are advised to upgrade to these updated packages, whichcontain a backported patch to correct this issue. For the update to takeeffect, all services linked to the NSS library must be restarted, or thesystem rebooted.