[Full-disclosure] [ GLSA 200507-13 ] pam_ldap and nss_ldap: Plain text authentication leak

From: Thierry Carrez (koon_at_gentoo.org)
Date: 07/14/05

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To: gentoo-announce@lists.gentoo.org

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    Gentoo Linux Security Advisory GLSA 200507-13
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: pam_ldap and nss_ldap: Plain text authentication leak
          Date: July 14, 2005
          Bugs: #96767
            ID: 200507-13

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    Synopsis
    ========

    pam_ldap and nss_ldap fail to restart TLS when following a referral,
    possibly leading to credentials being sent in plain text.

    Background
    ==========

    pam_ldap is a Pluggable Authentication Module which allows
    authentication against an LDAP directory. nss_ldap is a Name Service
    Switch module which allows 'passwd', 'group' and 'host' database
    information to be pulled from LDAP. TLS is Transport Layer Security, a
    protocol that allows encryption of network communications.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 sys-auth/nss_ldap < 239-r1 >= 239-r1
                                                                *>= 226-r1
      2 sys-auth/pam_ldap < 178-r1 >= 178-r1
        -------------------------------------------------------------------
         2 affected packages on all of their supported architectures.
        -------------------------------------------------------------------

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

    Rob Holland of the Gentoo Security Audit Team discovered that pam_ldap
    and nss_ldap fail to use TLS for referred connections if they are
    referred to a master after connecting to a slave, regardless of the
    "ssl start_tls" ldap.conf setting.

    Impact
    ======

    An attacker could sniff passwords or other sensitive information as the
    communication is not encrypted.

    Workaround
    ==========

    pam_ldap and nss_ldap can be set to force the use of SSL instead of
    TLS.

    Resolution
    ==========

    All pam_ldap users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=sys-auth/pam_ldap-178-r1"

    All nss_ldap users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose sys-auth/nss_ldap

    References
    ==========

      [ 1 ] CAN-2005-2069
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2069

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

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

      http://security.gentoo.org/glsa/glsa-200507-13.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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