The pam_parse_in_data_v2 function in src/responder/pam/pamsrv_cmd.c in the PAM responder in SSSD 1.5.0, 1.4.x, and 1.3 allows local users to cause a denial of service (infinite loop, crash, and login prevention) via a crafted packet.

The remote Oracle Linux 5 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2011-0975 advisory.

    [1.5.1-37]
    - Reverts:  rhbz#680443 - Dynamic DNS update fails if multiple servers are
    -                         given in ipa_server config option

    [1.5.1-36]
    - Resolves: rhbz#709333 - sssd. should require sssd-client.

    [1.5.1-35]
    - Resolves: rhbz#707340 - latest sssd fails if ldap_default_authtok_type is
    -                         not mentioned
    - Resolves: rhbz#707574 - SSSD's async resolver only tries the first
    -                         nameserver in /etc/resolv.conf

    [1.5.1-34]
    - Resolves: rhbz#701702 - sssd client libraries use select() but should use
    -                         poll() instead

    [1.5.1-33]
    - Related:  rhbz#700858 - Automatic TGT renewal overwrites cached password
    - Fix segfault in TGT renewal

    [1.5.1-32]
    - Resolves: rhbz#700858 - Automatic TGT renewal overwrites cached password

    [1.5.1-30]
    - Resolves: rhbz#696979 - Filters not honoured against fully-qualified users

    [1.5.1-29]
    - Resolves: rhbz#694149 - SSSD consumes GBs of RAM, possible memory leak

    [1.5.1-28]
    - Related:  rhbz#691900 - SSSD needs to fall back to 'cn' for GECOS
    -                         information

    [1.5.1-27]
    - Related:  rhbz#694853 - SSSD crashes during getent when anonymous bind is
    -                         disabled

    [1.5.1-26]
    - Resolves: rhbz#695476 - Unable to resolve SRV record when called with     [in ldap_uri]
    - Related:  rhbz#694853 - SSSD crashes during getent when anonymous bind is
    -                         disabled

    [1.5.1-25]
    - Resolves: rhbz#694853 - SSSD crashes during getent when anonymous bind is
    -                         disabled

    [1.5.1-24]
    - Resolves: rhbz#692960 - Process /usr/libexec/sssd/sssd_be was killed by
    -                         signal 11 (SIGSEGV)
    -                         Fix is to not attempt to resolve nameless servers

    [1.5.1-23]
    - Resolves: rhbz#691900 - SSSD needs to fall back to 'cn' for GECOS
    -                         information

    [1.5.1-21]
    - Resolves: rhbz#690867 - Groups with a zero-length memberuid attribute can
    -                         cause SSSD to stop caching and responding to
    -                         requests

    [1.5.1-20]
    - Resolves: rhbz#690287 - Traceback messages seen while interrupting
    -                         sss_obfuscate using ctrl+d
    - Resolves: rhbz#690814 - [abrt] sssd-1.2.1-28.el6_0.4: _talloc_free: Process
    -                         /usr/libexec/sssd/sssd_be was killed by signal 11
    -                         (SIGSEGV)

    [1.5.1-19]
    - Related: rhbz#690096 - SSSD should skip over groups with multiple names

    [1.5.1-18]
    - Resolves: rhbz#690093 - SSSD breaks on RDNs with a comma in them
    - Resolves: rhbz#690096 - SSSD should skip over groups with multiple names
    - Resolves: rhbz#689887 - group memberships are not populated correctly during
    -                         IPA provider initgroups
    - Resolves: rhbz#688697 - Skip users and groups that have incomplete contents
    - Resolves: rhbz#688694 - authconfig fails when access_provider is set as krb5
    -                         in sssd.conf

    [1.5.1-17]
    - Resolves: rhbz#688677 - Build SSSD in RHEL 5.7 against openldap24-libs
    - Adds support for following LDAP referrals and using Mozilla NSS for crypto
    - support

    [1.5.1-16]
    - Resolves: rhbz#683260 - sudo/ldap lookup via sssd gets stuck for 5min
    -                         waiting on netgroup
    - Resolves: rhbz#683585 - sssd consumes 100% CPU
    - Related: rhbz#680441  - sssd does not handle kerberos server IP change

    [1.5.1-15]
    - Related: rhbz#680441 - sssd does not handle kerberos server IP change
    -   SSSD was staying with the old server if it was still online

    [1.5.1-14]
    - Resolves: rhbz#682853 - IPA provider should use realm instead of ipa_domain
    -                         for base DN

    [1.5.1-13]
    - Resolves: rhbz#682803 - sssd-be segmentation fault - ipa-client on
    -                         ipa-server
    - Resolves: rhbz#680441 - sssd does not handle kerberos server IP change
    - Resolves: rhbz#680443 - Dynamic DNS update fails if multiple servers are
    -                         given in ipa_server config option
    - Resolves: rhbz#680933 - Do not delete sysdb memberOf if there is no memberOf
    -                         attribute on the server
    - Resolves: rhbz#682808 - sssd_nss core dumps with certain lookups

    [1.5.1-12]
    - Related: rhbz#679087 - SSSD IPA provider should honor the krb5_realm option
    - Related: rhbz#678615 - SSSD needs to look at IPA's compat tree for netgroups

    [1.5.1-11]
    - Resolves: rhbz#679087 - SSSD IPA provider should honor the krb5_realm option
    - Resolves: rhbz#679097 - Does not read renewable ccache at startup

    [1.5.1-10]
    - Resolves: rhbz#678606 - User information not updated on login for secondary
    -                         domains
    - Resolves: rhbz#678778 - IPA provider does not update removed group
    -                         memberships on initgroups

    [1.5.1-9]
    - Resolves: rhbz#678780 - sssd crashes at the next tgt renewals it tries
    - Resolves: rhbz#678412 - name service caches names, so id command shows
    -                         recently deleted users
    - Resolves: rhbz#678615 - SSSD needs to look at IPA's compat tree for
    -                         netgroups

    [1.5.1-8]
    - Related: rhbz#665314 - Rebase SSSD to 1.5 in RHEL 5.7
    - Fix generation of translated manpages

    [1.5.1-7]
    - Resolves: rhbz#665314 - Rebase SSSD to 1.5 in RHEL 5.7
    - Resolves: rhbz#676027 - sssd segfault when first entry of ldap_uri is
    -                         unreachable
    - Resolves: rhbz#678032 - Remove HBAC time rules from SSSD
    - Resolves: rhbz#675007 - sssd corrupts group cache
    - Resolves: rhbz#608864 - [RFE] Support obfuscated passwords in the SSSD
    -                         configuration

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 6 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2011-0560 advisory.

    [1.5.1-34]
    - Resolves: rhbz#701700 - sssd client libraries use select() but should use
    -                         poll() instead

    [1.5.1-33]
    - Related: rhbz#693818 - Automatic TGT renewal overwrites cached password
    - Fix segfault in TGT renewal

    [1.5.1-32]
    - Related: rhbz#693818 - Automatic TGT renewal overwrites cached password
    - Fix typo causing build breakage

    [1.5.1-31]
    - Resolves: rhbz#693818 - Automatic TGT renewal overwrites cached password

    [1.5.1-30]
    - Resolves: rhbz#696972 - Filters not honoured against fully-qualified users

    [1.5.1-29]
    - Resolves: rhbz#694146 - SSSD consumes GBs of RAM, possible memory leak

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

This update fixes a local denial-of-service attack that stops other users from logging in. The bug existed in the pam_parse_in_data_v2() function. (CVE-2010-4341: CVSS v2 Base Score: 2.1)

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)

These updated sssd packages include a number of bug fixes and enhancements. Space precludes documenting all of these changes in this advisory.

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.

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)

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.

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.

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.

The remote Redhat Enterprise Linux 5 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2011:0975 advisory.

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

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.

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.

Addresses low-priority CVE-2010-4341: DoS in sssd PAM responder can prevent logins

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
181078	Oracle Linux 5 : sssd (ELSA-2011-0975)	Nessus	Oracle Linux Local Security Checks	medium
181054	Oracle Linux 6 : sssd (ELSA-2011-0560)	Nessus	Oracle Linux Local Security Checks	medium
75573	openSUSE Security Update : libcollection-devel (openSUSE-SU-2011:0058-1)	Nessus	SuSE Local Security Checks	low
61094	Scientific Linux Security Update : sssd on SL5.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	low
61049	Scientific Linux Security Update : sssd on SL6.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	low
56260	CentOS 5 : sssd (CESA-2011:0975)	Nessus	CentOS Local Security Checks	low
55642	RHEL 5 : sssd (RHSA-2011:0975)	Nessus	Red Hat Local Security Checks	medium
54594	RHEL 6 : sssd (RHSA-2011:0560)	Nessus	Red Hat Local Security Checks	low
51655	Fedora 14 : sssd-1.5.0-2.fc14 (2011-0364)	Nessus	Fedora Local Security Checks	low
51651	Fedora 13 : sssd-1.3.0-40.fc13 (2011-0337)	Nessus	Fedora Local Security Checks	low

Detections

Analytics

CVE-2010-4341

medium

Tenable Plugins

medium

medium

low

low

low

low

medium

low

low

low