(RHSA-2011:0975) Low: sssd security, bug fix, and enhancement update

The System Security Services Daemon (SSSD) provides a set of daemons to
manage access to remote directories and authentication mechanisms. It
provides an NSS and PAM interface toward the system and a pluggable
back-end system to connect to multiple different account sources. It is
also the basis to provide client auditing and policy services for projects
such as FreeIPA.

A flaw was found in the SSSD PAM responder that could allow a local
attacker to force SSSD to enter an infinite loop via a carefully-crafted
packet. With SSSD unresponsive, legitimate users could be denied the
ability 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 to
the Red Hat Enterprise Linux 5.7 Technical Notes for information about
these changes:

https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/5.7_Technical_Notes/sssd.html#RHSA-2011-0975

All sssd users are advised to upgrade to these updated sssd packages, which
upgrade SSSD to upstream version 1.5.1 to correct this issue, and fix the
bugs and add the enhancements noted in the Technical Notes.