The System Security Services Daemon (SSSD) provides a set of daemons tomanage access to remote directories and authentication mechanisms. Itprovides an NSS and PAM interface toward the system and a pluggableback-end system to connect to multiple different account sources. It isalso the basis to provide client auditing and policy services for projectssuch as FreeIPA.A flaw was found in the SSSD PAM responder that could allow a localattacker to force SSSD to enter an infinite loop via a carefully-craftedpacket. With SSSD unresponsive, legitimate users could be denied theability to log in to the system. (CVE-2010-4341)Red Hat would like to thank Sebastian Krahmer for reporting this issue.These updated sssd packages include a number of bug fixes and enhancements.Space precludes documenting all of these changes in this advisory. Refer tothe Red Hat Enterprise Linux 5.7 Technical Notes for information aboutthese changes:https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/5.7_Technical_Notes/sssd.html#RHSA-2011-0975All sssd users are advised to upgrade to these updated sssd packages, whichupgrade SSSD to upstream version 1.5.1 to correct this issue, and fix thebugs and add the enhancements noted in the Technical Notes.