Vulnerability identifier: #VU45194

Vulnerability risk: Low

CVSSv3.1: 3 [CVSS:3.1/AV:N/AC:H/PR:/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-1024

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenLDAP
Server applications / Directory software, identity management

Vendor: OpenLDAP.org

Description

The vulnerability allows a remote #AU# to read and manipulate data.

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

OpenLDAP: 2.4.6 - 2.4.23

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External links
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
http://bugzilla.novell.com/show_bug.cgi?id=674985
http://bugzilla.redhat.com/show_bug.cgi?id=680466

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.