Otkrivena je sigurnosna ranjivost u paketu sssd (System Security Services Daemon) koja može rezultirati lokalnim izvođenjem napada uskraćivanja usluge (eng. Denial of Service).

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                   Red Hat Security Advisory

Synopsis:          Low: sssd security, bug fix, and enhancement update
Advisory ID:       RHSA-2011:0975-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-0975.html
Issue date:        2011-07-21
CVE Names:         CVE-2010-4341 
=====================================================================

1. Summary:

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_,<fixed ldap uri>
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

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/sssd-1.5.1-37.el5.src.rpm

i386:
sssd-1.5.1-37.el5.i386.rpm
sssd-client-1.5.1-37.el5.i386.rpm
sssd-debuginfo-1.5.1-37.el5.i386.rpm
sssd-tools-1.5.1-37.el5.i386.rpm

x86_64:
sssd-1.5.1-37.el5.x86_64.rpm
sssd-client-1.5.1-37.el5.i386.rpm
sssd-client-1.5.1-37.el5.x86_64.rpm
sssd-debuginfo-1.5.1-37.el5.i386.rpm
sssd-debuginfo-1.5.1-37.el5.x86_64.rpm
sssd-tools-1.5.1-37.el5.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/sssd-1.5.1-37.el5.src.rpm

i386:
sssd-1.5.1-37.el5.i386.rpm
sssd-client-1.5.1-37.el5.i386.rpm
sssd-debuginfo-1.5.1-37.el5.i386.rpm
sssd-tools-1.5.1-37.el5.i386.rpm

ia64:
sssd-1.5.1-37.el5.ia64.rpm
sssd-client-1.5.1-37.el5.i386.rpm
sssd-client-1.5.1-37.el5.ia64.rpm
sssd-debuginfo-1.5.1-37.el5.i386.rpm
sssd-debuginfo-1.5.1-37.el5.ia64.rpm
sssd-tools-1.5.1-37.el5.ia64.rpm

ppc:
sssd-1.5.1-37.el5.ppc.rpm
sssd-client-1.5.1-37.el5.ppc.rpm
sssd-client-1.5.1-37.el5.ppc64.rpm
sssd-debuginfo-1.5.1-37.el5.ppc.rpm
sssd-debuginfo-1.5.1-37.el5.ppc64.rpm
sssd-tools-1.5.1-37.el5.ppc.rpm

s390x:
sssd-1.5.1-37.el5.s390x.rpm
sssd-client-1.5.1-37.el5.s390.rpm
sssd-client-1.5.1-37.el5.s390x.rpm
sssd-debuginfo-1.5.1-37.el5.s390.rpm
sssd-debuginfo-1.5.1-37.el5.s390x.rpm
sssd-tools-1.5.1-37.el5.s390x.rpm

x86_64:
sssd-1.5.1-37.el5.x86_64.rpm
sssd-client-1.5.1-37.el5.i386.rpm
sssd-client-1.5.1-37.el5.x86_64.rpm
sssd-debuginfo-1.5.1-37.el5.i386.rpm
sssd-debuginfo-1.5.1-37.el5.x86_64.rpm
sssd-tools-1.5.1-37.el5.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2010-4341.html
https://access.redhat.com/security/updates/classification/#low
https://fedorahosted.org/sssd/wiki/Releases/Notes-1.5.1
https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/5.7_Technical_Notes/sssd.html#RHSA-2011-0975

8. Contact:

The Red Hat security contact is <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2011 Red Hat, Inc.
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