Improper input validation in OpenLDAP

1) Input validation error

EUVDB-ID: #VU98559

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 - Improper input validation

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:openldap_org:openldap:2.4:*:*:*:*:*:*:*
• cpe:2.3:a:openldap_org:openldap:2.4.3:*:*:*:*:*:*:*
• cpe:2.3:a:openldap_org:openldap:2.4.6:*:*:*:*:*:*:*

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.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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