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TI-2011-00883 Aliases CVE-2011-1024GHSA-v9w5-g35w-fmjv

chain.c in back-ldap in OpenLDAP 2.4.x before 2.4.24, when a master-slave configuration…

Priority LOW 26CWE-264Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
— Not recorded in CVSS 2.0
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
Partial · Partial · Partial
Fix status
Fixed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-264.

Summary

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.

Why it matters now

EPSS 0.02593 85th percentileScored 2026-11-07
Fix Fixed Red Hat: 2 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 18

CPEVersionsRoleVendor
cpe:2.3:a:openldap:openldap:2.4.6:*:*:*:*:*:*:*2.4.6Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.7:*:*:*:*:*:*:*2.4.7Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.8:*:*:*:*:*:*:*2.4.8Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.9:*:*:*:*:*:*:*2.4.9Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.10:*:*:*:*:*:*:*2.4.10Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.11:*:*:*:*:*:*:*2.4.11Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.12:*:*:*:*:*:*:*2.4.12Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.13:*:*:*:*:*:*:*2.4.13Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.14:*:*:*:*:*:*:*2.4.14Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.15:*:*:*:*:*:*:*2.4.15Vulnerableopenldap
  • cpe:2.3:a:openldap:openldap:2.4.6:*:*:*:*:*:*:* Versions 2.4.6 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.7:*:*:*:*:*:*:* Versions 2.4.7 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.8:*:*:*:*:*:*:* Versions 2.4.8 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.9:*:*:*:*:*:*:* Versions 2.4.9 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.10:*:*:*:*:*:*:* Versions 2.4.10 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.11:*:*:*:*:*:*:* Versions 2.4.11 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.12:*:*:*:*:*:*:* Versions 2.4.12 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.13:*:*:*:*:*:*:* Versions 2.4.13 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.14:*:*:*:*:*:*:* Versions 2.4.14 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.15:*:*:*:*:*:*:* Versions 2.4.15 Vulnerable ·openldap
Show 8 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:openldap:openldap:2.4.16:*:*:*:*:*:*:*2.4.16Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.17:*:*:*:*:*:*:*2.4.17Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.18:*:*:*:*:*:*:*2.4.18Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.19:*:*:*:*:*:*:*2.4.19Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.20:*:*:*:*:*:*:*2.4.20Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.21:*:*:*:*:*:*:*2.4.21Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.22:*:*:*:*:*:*:*2.4.22Vulnerableopenldap
cpe:2.3:a:openldap:openldap:2.4.23:*:*:*:*:*:*:*2.4.23Vulnerableopenldap
  • cpe:2.3:a:openldap:openldap:2.4.16:*:*:*:*:*:*:* Versions 2.4.16 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.17:*:*:*:*:*:*:* Versions 2.4.17 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.18:*:*:*:*:*:*:* Versions 2.4.18 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.19:*:*:*:*:*:*:* Versions 2.4.19 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.20:*:*:*:*:*:*:* Versions 2.4.20 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.21:*:*:*:*:*:*:* Versions 2.4.21 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.22:*:*:*:*:*:*:* Versions 2.4.22 Vulnerable ·openldap
  • cpe:2.3:a:openldap:openldap:2.4.23:*:*:*:*:*:*:* Versions 2.4.23 Vulnerable ·openldap

Remediation

Red Hat 2 advisories

  • RHSA-2011:0347 Released 2011-03-10 · Red Hat rating Moderate
    openldap security update
    • Red Hat Enterprise Linux Desktop (v. 6) compat-openldap-2.4.19_2.3.43-15.el6_0.2, openldap-2.4.19-15.el6_0.2, openldap-clients-2.4.19-15.el6_0.2
    • Red Hat Enterprise Linux Desktop Optional (v. 6) openldap-2.4.19-15.el6_0.2, openldap-devel-2.4.19-15.el6_0.2, openldap-servers-2.4.19-15.el6_0.2 +1
    • Red Hat Enterprise Linux HPC Node (v. 6) compat-openldap-2.4.19_2.3.43-15.el6_0.2, openldap-2.4.19-15.el6_0.2
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) openldap-2.4.19-15.el6_0.2, openldap-clients-2.4.19-15.el6_0.2, openldap-devel-2.4.19-15.el6_0.2 +2
    • Red Hat Enterprise Linux Server (v. 6) compat-openldap-2.4.19_2.3.43-15.el6_0.2, compat-openldap-2.4.19_2.3.43-15.el6_0.2.ppc, openldap-2.4.19-15.el6_0.2 +5
    • Red Hat Enterprise Linux Server Optional (v. 6) openldap-2.4.19-15.el6_0.2, openldap-servers-sql-2.4.19-15.el6_0.2
    • Red Hat Enterprise Linux Workstation (v. 6) compat-openldap-2.4.19_2.3.43-15.el6_0.2, openldap-2.4.19-15.el6_0.2, openldap-clients-2.4.19-15.el6_0.2 +2
    • Red Hat Enterprise Linux Workstation Optional (v. 6) openldap-2.4.19-15.el6_0.2, openldap-servers-sql-2.4.19-15.el6_0.2
  • RHSA-2011:0346 Released 2011-03-10 · Red Hat rating Moderate
    openldap security and bug fix update
    • Red Hat Enterprise Linux (v. 5.6.z server) compat-openldap-2.3.43_2.2.29-12.el5_6.7, compat-openldap-2.3.43_2.2.29-12.el5_6.7.i386, compat-openldap-2.3.43_2.2.29-12.el5_6.7.ia64 +25

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux (v. 5.6.z server)Fixed RHSA-2011:0346
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2011:0347
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2011:0347
Red Hat Enterprise Linux HPC Node (v. 6)Fixed RHSA-2011:0347
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2011:0347
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2011:0347
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2011:0347
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2011:0347
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2011:0347
Not affected: 1 product
  • Red Hat Enterprise Linux 4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2011-1024
  2. 2026-10-03 Alias added: GHSA-v9w5-g35w-fmjv

References

Patch 2

Advisory 7

Other 8

  • TI-2022-11700 In OpenLDAP 2.x before 2.5.12 and 2.6.x before 2.6.2, a SQL injection vulnerability… CVSS 3.1CRITICAL 9.8
  • TI-2020-18548 An integer underflow was discovered in OpenLDAP before 2.4.57 leading to a slapd crash in… CVSS 3.1HIGH 7.5
  • TI-2020-18541 An integer underflow was discovered in OpenLDAP before 2.4.57 leading to slapd crashes in… CVSS 3.1HIGH 7.5
  • TI-2020-18547 A flaw was discovered in OpenLDAP before 2.4.57 leading to an infinite loop in slapd with… CVSS 3.1HIGH 7.5
  • TI-2020-18542 A flaw was discovered in OpenLDAP before 2.4.57 leading to an assertion failure in slapd… CVSS 3.1HIGH 7.5
  • TI-2006-05563 OpenLDAP before 2.3.29 allows remote attackers to cause a denial of service (daemon… CVSS 3.1HIGH 7.5
See all 58 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences