Input validation error in OpenLDAP

1) Input validation error

EUVDB-ID: #VU33285

Risk: Medium

CVSSv4.0: 2.7 [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:U/U:Green]

CVE-ID: CVE-2015-6908

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The ber_get_next function in libraries/liblber/io.c in OpenLDAP 2.4.42 and earlier allows remote attackers to cause a denial of service (reachable assertion and application crash) via crafted BER data, as demonstrated by an attack against slapd.

Mitigation

Install update from vendor's website.

Vulnerable software versions

OpenLDAP: 2.4.3 - 2.4.42

CPE2.3

• cpe:2.3:a:openldap_org:openldap:2.4.3:*:*:*:*:*:*:*
• cpe:2.3:a:openldap_org:openldap:2.4.6:*:*:*:*:*:*:*
• cpe:2.3:a:openldap_org:openldap:2.4.7:*:*:*:*:*:*:*

External links

https://lists.apple.com/archives/security-announce/2015/Dec/msg00005.html
https://lists.opensuse.org/opensuse-security-announce/2016-01/msg00031.html
https://lists.opensuse.org/opensuse-security-announce/2016-01/msg00032.html
https://lists.opensuse.org/opensuse-security-announce/2016-01/msg00037.html
https://lists.opensuse.org/opensuse-security-announce/2016-01/msg00039.html
https://lists.opensuse.org/opensuse-security-announce/2016-01/msg00040.html
https://rhn.redhat.com/errata/RHSA-2015-1840.html
https://www.debian.org/security/2015/dsa-3356
https://www.openldap.org/devel/gitweb.cgi?p=openldap.git;a=commit;h=6fe51a9ab04fd28bbc171da3cf12f1c1040d6629
https://www.openldap.org/its/index.cgi/Software%20Bugs?id=8240
https://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
https://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
https://www.security-assessment.com/files/documents/advisory/OpenLDAP-ber_get_next-Denial-of-Service.pdf
https://www.securityfocus.com/bid/76714
https://www.securitytracker.com/id/1033534
https://www.ubuntu.com/usn/USN-2742-1
https://support.apple.com/HT205637

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.