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    CVE-2011-1024

    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.

    Published:Jul 28, 2010
    Last Modified:Apr 11, 2025
    EPS:Mar 20, 2011
    EPSS Score:0.00247
    CVSS Score:4.6

    Affected Products

    Vendor
    Openldap
    Product
    Openldap
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-22185 (CVSS 4.6) — OpenLDAP Lightning Memory-Mapped Database (LMDB) versions up to and including 0.9.14, prior to commit 8e1fda8,…
    CVE-2023-2953 (CVSS 7.5) — A vulnerability was found in openldap. This security flaw causes a null pointer dereference in ber_memalloc_x(…
    CVE-2022-29155 (CVSS 9.8) — In OpenLDAP 2.x before 2.5.12 and 2.6.x before 2.6.2, a SQL injection vulnerability exists in the experimental…
    CVE-2021-27212 (CVSS 7.5) — In OpenLDAP through 2.4.57 and 2.5.x through 2.5.1alpha, an assertion failure in slapd can occur in the issuer…
    CVE-2020-36221 (CVSS 7.5) — An integer underflow was discovered in OpenLDAP before 2.4.57 leading to slapd crashes in the Certificate Exac…
    CVE-2020-36222 (CVSS 7.5) — A flaw was discovered in OpenLDAP before 2.4.57 leading to an assertion failure in slapd in the saslAuthzTo va…
    CVE-2020-36224 (CVSS 7.5) — A flaw was discovered in OpenLDAP before 2.4.57 leading to an invalid pointer free and slapd crash in the sasl…
    CVE-2020-36225 (CVSS 7.5) — A flaw was discovered in OpenLDAP before 2.4.57 leading to a double free and slapd crash in the saslAuthzTo pr…
    CVE-2020-36226 (CVSS 7.5) — A flaw was discovered in OpenLDAP before 2.4.57 leading to a memch->bv_len miscalculation and slapd crash in t…
    CVE-2020-36228 (CVSS 7.5) — An integer underflow was discovered in OpenLDAP before 2.4.57 leading to a slapd crash in the Certificate List…

    References

    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://secunia.com/advisories/43331
    http://secunia.com/advisories/43708
    http://secunia.com/advisories/43718
    http://security.gentoo.org/glsa/glsa-201406-36.xml
    http://securitytracker.com/id?1025188
    http://www.mandriva.com/security/advisories?name=MDVSA-2011:055
    http://www.mandriva.com/security/advisories?name=MDVSA-2011:056
    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/its/index.cgi/Software%20Bugs?id=6607
    http://www.openldap.org/lists/openldap-announce/201102/msg00000.html
    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
    http://www.ubuntu.com/usn/USN-1100-1
    http://www.vupen.com/english/advisories/2011/0665
    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://secunia.com/advisories/43331
    http://secunia.com/advisories/43708
    http://secunia.com/advisories/43718
    http://security.gentoo.org/glsa/glsa-201406-36.xml
    http://securitytracker.com/id?1025188
    http://www.mandriva.com/security/advisories?name=MDVSA-2011:055
    http://www.mandriva.com/security/advisories?name=MDVSA-2011:056
    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/its/index.cgi/Software%20Bugs?id=6607
    http://www.openldap.org/lists/openldap-announce/201102/msg00000.html
    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
    http://www.ubuntu.com/usn/USN-1100-1
    http://www.vupen.com/english/advisories/2011/0665
    https://bugzilla.novell.com/show_bug.cgi?id=674985
    https://bugzilla.redhat.com/show_bug.cgi?id=680466

    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