RHSA-2011:0560 - Security Advisory

Topic

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.

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.

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

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x

Fixes

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

CVEs

• CVE-2010-4341

References

• https://access.redhat.com/security/updates/classification/#low
• https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.1_Technical_Notes/index.html