[Full-disclosure] [ GLSA 200508-22 ] pam_ldap: Authentication bypass vulnerability

From: Sune Kloppenborg Jeppesen (jaervosz_at_gentoo.org)
Date: 08/31/05

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    To: gentoo-announce@gentoo.org
Date: Wed, 31 Aug 2005 16:36:37 +0200

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    Gentoo Linux Security Advisory GLSA 200508-22
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: pam_ldap: Authentication bypass vulnerability
          Date: August 31, 2005
          Bugs: #103659
            ID: 200508-22

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    Synopsis
    ========

    pam_ldap contains a vulnerability that may allow a remote attacker to
    gain system access.

    Background
    ==========

    pam_ldap is a Pluggable Authentication Module which allows
    authentication against LDAP directories.

    Affected packages
    =================

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 sys-auth/pam_ldap < 180 >= 180

    Description
    ===========

    When a pam_ldap client attempts to authenticate against an LDAP server
    that omits the optional error value from the
    PasswordPolicyResponseValue, the authentication attempt will always
    succeed.

    Impact
    ======

    A remote attacker may exploit this vulnerability to bypass the LDAP
    authentication mechanism, gaining access to the system possibly with
    elevated privileges.

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

    All pam_ldap users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=sys-auth/pam_ldap-180"

    References
    ==========

      [ 1 ] CAN-2005-2641
            http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2641
      [ 2 ] US-CERT VU#778916
            http://www.kb.cert.org/vuls/id/778916

    Availability
    ============

    This GLSA and any updates to it are available for viewing at
    the Gentoo Security Website:

      http://security.gentoo.org/glsa/glsa-200508-22.xml

    Concerns?
    =========

    Security is a primary focus of Gentoo Linux and ensuring the
    confidentiality and security of our users machines is of utmost
    importance to us. Any security concerns should be addressed to
    security@gentoo.org or alternatively, you may file a bug at
    http://bugs.gentoo.org.

    License
    =======

    Copyright 2005 Gentoo Foundation, Inc; referenced text
    belongs to its owner(s).

    The contents of this document are licensed under the
    Creative Commons - Attribution / Share Alike license.

    http://creativecommons.org/licenses/by-sa/2.0

    _______________________________________________
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    Relevant Pages

    • Solaris Security Summary
      ... Administering Security on the Solaris OE ... Configuration control, facility management, and system ... Authentication: The ability to prove who you are. ...
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    • Re: Enabling telnet, ftp, pop3 for root...
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    • Re: passwords
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