2.1 - RHSA-2011:0560

Problem Description:

Updated sssd packages that fix one security issue, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 6.

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 Desktop (v. 6) - i386, x86_64 Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64 Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 6) - 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 crash SSSD 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.

This update also fixes several bugs and adds various enhancements. Documentation for these bug fixes and enhancements will be available shortly from the Technical Notes document, linked to in the References section.

Users of SSSD should upgrade to these updated 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/):

442680 - Better support for Kerberos ticket cache management 598501 - SSSD doesn't follow LDAP referrals when using non-anonymous bind 633406 - the krb5 locator plugin isn't packaged for multilib 633487 - SSSD initgroups does not behave as expected 640602 - sssd is not escaping correctly LDAP searches 644072 - Rebase SSSD to 1.5 645438 - NSS responder dies if DP dies during a request 645449 - 'getent passwd ' returns nothing if its uidNumber gt 2147483647. 647816 - Login screen freezes for more than 2mins when configured SSSD for proxy auth. 649286 - SSSD will sometimes lose groups from the cache 658158 - sssd stops on upgrade 659401 - SSSD shutdown sometimes hangs 660323 - Provide an option to specify DNS domain for service discovery 661163 - CVE-2010-4341 sssd: DoS in sssd PAM responder can prevent logins 667059 - nss client blocks when enumerating local domain after restart. 667326 - '-s' option in sss_obfuscate command is a bit redundant. 667349 - Obfuscated passwords can kill LDAP provider if OpenLDAP uses NSS. 670511 - SSSD and sftp-only jailed users with pubkey login 670763 - Missing primary group with simple access provider. 670804 - Nested groups are not unrolled during the first enumeration. 671478 - authconfig-tui/gtk removes "ldap_user_home_directory" from sssd.conf 674141 - Traceback call messages displayed while "sss_obfuscate" command is executed as a non-root user. 674164 - sss_obfuscate fails if there's no domain named "default". 674172 - Group members are not sanitized in nested group processing 674515 - -p option always uses empty string to obfuscate password. 675284 - "no matching rule" message logged on all successful requests. 676401 - Remove HBAC time rules from SSSD 676911 - SSSD attempts to use START_TLS over LDAPS for authentication 677318 - Does not read renewable ccache at startup. 677588 - sssd crashes at the next tgt renewals it tries. 678091 - SSSD in 6.0 can not locate HBAC rules from FreeIPAv2 678410 - name service caches names, so id command shows recently deleted users 678593 - User information not updated on login for secondary domains 678614 - SSSD needs to look at IPA's compat tree for netgroups 678777 - IPA provider does not update removed group memberships on initgroups 679082 - SSSD IPA provider should honor the krb5_realm option 680367 - sssd not thread-safe 682340 - sssd-be segmentation fault - ipa-client on ipa-server 682807 - sssd_nss core dumps with certain lookups 682850 - IPA provider should use realm instead of ipa_domain for base DN 683158 - multiple problems with sssd + ldap (Active-Directory) and groups members. 683255 - sudo/ldap lookup via sssd gets stuck for 5min waiting on netgroup 683860 - sssd 1.5.1-9 breaks AD authentication 683885 - SSSD should skip over groups with multiple names 688491 - authconfig fails when access_provider is set as krb5 in sssd.conf. 689886 - group memberships are not populated correctly during IPA provider initgroups 690131 - Traceback messages seen while interrupting sss_obfuscate using ctrl+d. 690421 - [abrt] sssd-1.2.1-28.el6_0.4: _talloc_free: Process /usr/libexec/sssd/sssd_be was killed by signal 11 (SIGSEGV) 690866 - Groups with a zero-length memberuid attribute can cause SSSD to stop caching and responding to requests 691678 - SSSD needs to fall back to 'cn' for GECOS information (was: SSSD configuration problem when configured with MSAD) 692472 - Process /usr/libexec/sssd/sssd_be was killed by signal 11 (SIGSEGV) 694146 - SSSD consumes GBs of RAM, possible memory leak 694444 - Unable to resolve SRV record when called with _srv_, in ldap_uri 694783 - SSSD crashes during getent when anonymous bind is disabled. 696972 - [REGRESSION] Filters not honoured against fully-qualified users. 701700 - sssd client libraries use select() but should use poll() instead