CVE-2011-1024

Severity: medium (CVSS 4.6 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-03-20 · updated 2026-06-16
Weakness: CWE-264

Description

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.

Affected products

openldap: 2.4.6, 2.4.7, 2.4.8, 2.4.9, 2.4.10, 2.4.11 (+12)

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

Get alerted when CVE-2011-1024 or the next vulnerability affects your stack