2.1 - RHSA-2011:0975

Problem Description:

Updated sssd packages that fix one security issue, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having low security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64 Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

3. Description:

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_Tech nical_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.

4. Solution:

Before applying this update, make sure all previously-released errata relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/kb/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

640601 - sssd is not escaping correctly LDAP searches 661163 - CVE-2010-4341 sssd: DoS in sssd PAM responder can prevent logins 675007 - sssd corrupts group cache 676027 - sssd segfault when first entry of ldap_uri is unreachable 678032 - Remove HBAC time rules from SSSD 678092 - SSSD in 5.6 can not locate HBAC rules from FreeIPAv2 678412 - name service caches names, so id command shows recently deleted users 678606 - User information not updated on login for secondary domains 678615 - SSSD needs to look at IPA's compat tree for netgroups 678778 - IPA provider does not update removed group memberships on initgroups 678780 - sssd crashes at the next tgt renewals it tries. 679087 - SSSD IPA provider should honor the krb5_realm option 679097 - Does not read renewable ccache at startup. 682803 - sssd-be segmentation fault - ipa-client on ipa-server 682808 - sssd_nss core dumps with certain lookups 682853 - IPA provider should use realm instead of ipa_domain for base DN 683260 - sudo/ldap lookup via sssd gets stuck for 5min waiting on netgroup 688677 - Build SSSD in RHEL 5.7 against openldap24-libs 688694 - authconfig fails when access_provider is set as krb5 in sssd.conf. 688697 - sssd 1.5.1-9 breaks AD authentication 689887 - group memberships are not populated correctly during IPA provider initgroups 690093 - multiple problems with sssd + ldap (Active-Directory) and groups members. 690096 - SSSD should skip over groups with multiple names 690287 - Traceback messages seen while interrupting sss_obfuscate using ctrl+d. 690814 - [abrt] sssd-1.2.1-28.el6_0.4: _talloc_free: Process /usr/libexec/sssd/sssd_be was killed by signal 11 (SIGSEGV) 690867 - Groups with a zero-length memberuid attribute can cause SSSD to stop caching and responding to requests 691900 - SSSD needs to fall back to 'cn' for GECOS information (was: SSSD configuration problem when configured with MSAD) 692960 - Process /usr/libexec/sssd/sssd_be was killed by signal 11 (SIGSEGV) 694149 - SSSD consumes GBs of RAM, possible memory leak 694853 - SSSD crashes during getent when anonymous bind is disabled. 695476 - Unable to resolve SRV record when called with _srv_, in ldap_uri 696979 - [REGRESSION] Filters not honoured against fully-qualified users. 701702 - sssd client libraries use select() but should use poll() instead 707340 - latest sssd fails if ldap_default_authtok_type is not mentioned 707574 - SSSD's async resolver only tries the first nameserver in /etc/resolv.conf