#VU98559 Input validation error in OpenLDAP - CVE-2015-3276

Vulnerability identifier: #VU98559

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-3276

CWE-ID: CWE-20

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 bypass implemented security restrictions.

The vulnerability exists due to insufficient validation of user-supplied input within the nss_parse_ciphers() function in libraries/libldap/tls_m.c when parsing OpenSSL-style multi-keyword mode cipher strings. A remote attacker can pass force the application to use a weaker than intended cipher.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

OpenLDAP: 2.4 - 2.4.59

---

External links
https://www.securitytracker.com/id/1034221
https://rhn.redhat.com/errata/RHSA-2015-2131.html
https://bugzilla.redhat.com/show_bug.cgi?id=1238322
https://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html

---

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.