#VU45182 Resource management error in OpenLDAP - CVE-2011-1081

Vulnerability identifier: #VU45182

Vulnerability risk: Medium

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2011-1081

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: Yes

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

Vendor: OpenLDAP.org

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

modrdn.c in slapd in OpenLDAP 2.4.x before 2.4.24 allows remote attackers to cause a denial of service (daemon crash) via a relative Distinguished Name (DN) modification request (aka MODRDN operation) that contains an empty value for the OldDN field.

Mitigation
Install update from vendor's website.

Vulnerable software versions

OpenLDAP: 2.4.6 - 2.4.23

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External links
https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705
https://openwall.com/lists/oss-security/2011/02/28/1
https://openwall.com/lists/oss-security/2011/02/28/2
https://openwall.com/lists/oss-security/2011/03/01/11
https://openwall.com/lists/oss-security/2011/03/01/15
https://secunia.com/advisories/43331
https://secunia.com/advisories/43718
https://security.gentoo.org/glsa/glsa-201406-36.xml
https://securitytracker.com/id?1025191
https://www.mandriva.com/security/advisories?name=MDVSA-2011:055
https://www.mandriva.com/security/advisories?name=MDVSA-2011:056
https://www.openldap.org/devel/cvsweb.cgi/servers/slapd/modrdn.c.diff?r1=1.170.2.8&r2=1.170.2.9
https://www.openldap.org/its/index.cgi/Software%20Bugs?id=6768
https://www.openldap.org/lists/openldap-announce/201102/msg00000.html
https://www.redhat.com/support/errata/RHSA-2011-0347.html
https://www.ubuntu.com/usn/USN-1100-1
https://www.vupen.com/english/advisories/2011/0665
https://bugzilla.novell.com/show_bug.cgi?id=674985
https://bugzilla.redhat.com/show_bug.cgi?id=680975
https://exchange.xforce.ibmcloud.com/vulnerabilities/66239

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.