Vulnerability identifier: #VU33332

Vulnerability risk: Low

CVSSv3.1: 1.3 [CVSS:3.1/AV:N/AC:L/PR:/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-4079

CWE-ID: CWE-122

Exploitation vector: Network

Exploit availability: No

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

Vendor: OpenLDAP.org

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in Off-by-one error in the UTF8StringNormalize function in OpenLDAP 2.4.26 and earlier. A remote attacker can use a zero-length string that triggers a heap-based buffer overflow to trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Update to version 2.4.27.

Vulnerable software versions

OpenLDAP: 2.4.3 - 2.4.26

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External links
http://secunia.com/advisories/46599
http://security.gentoo.org/glsa/glsa-201406-36.xml
http://www.openldap.org/devel/gitweb.cgi?p=openldap.git;a=commitdiff;h=507238713b71208ec4f262f312cb495a302df9e9
http://www.openldap.org/its/index.cgi/Software%20Bugs?id=7059;selectid=7059
http://www.openwall.com/lists/oss-security/2011/10/26/5
http://www.openwall.com/lists/oss-security/2011/10/26/9
http://www.securityfocus.com/bid/50384
http://www.ubuntu.com/usn/USN-1266-1
http://bugzilla.redhat.com/show_bug.cgi?id=749324
http://exchange.xforce.ibmcloud.com/vulnerabilities/70991

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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.