CVE-2011-1024

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    CVE-2011-1024

    Published: 20 Mar 2011Last Modified: 10 Apr 2026

    Summary:

    Details: chain.c in back-ldap in OpenLDAP 2.4.x before 2.4.24, when a master-slave configuration with a chain overlay and ppolicy_forward_updates (aka authentication-failure forwarding) is used, allows remote authenticated users to bypass external-program authentication by sending an invalid password to a slave server.

    References: http://secunia.com/advisories/43331, http://secunia.com/advisories/43708, http://secunia.com/advisories/43718, http://security.gentoo.org/glsa/glsa-201406-36.xml, http://www.mandriva.com/security/advisories?name=MDVSA-2011:055, http://www.mandriva.com/security/advisories?name=MDVSA-2011:056, http://www.ubuntu.com/usn/USN-1100-1, http://www.vupen.com/english/advisories/2011/0665, http://www.openldap.org/devel/cvsweb.cgi/servers/slapd/back-ldap/chain.c.diff?r1=1.76&r2=1.77&hideattic=1&sortbydate=0, http://www.openldap.org/lists/openldap-announce/201102/msg00000.html, https://bugzilla.novell.com/show_bug.cgi?id=674985, https://bugzilla.redhat.com/show_bug.cgi?id=680466, http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705, http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10735, http://openwall.com/lists/oss-security/2011/02/24/12, http://openwall.com/lists/oss-security/2011/02/25/13, http://securitytracker.com/id?1025188, http://www.openldap.org/its/index.cgi/Software%20Bugs?id=6607, http://www.openldap.org/lists/openldap-technical/201004/msg00247.html, http://www.redhat.com/support/errata/RHSA-2011-0346.html, http://www.redhat.com/support/errata/RHSA-2011-0347.html

    Affected packages

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High