#VU50398 Release of invalid pointer or reference in OpenLDAP - CVE-2020-36224

Vulnerability identifier: #VU50398

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-36224

CWE-ID: CWE-763

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 perform a denial of service (DoS) attack.

The vulnerability exists due to release of an invalid pointer when processing saslAuthzTo requests. A remote attacker can send a specially crafted request to slapd and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

OpenLDAP: 2.4.3 - 2.4.56

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External links
https://bugs.openldap.org/show_bug.cgi?id=9409
https://git.openldap.org/openldap/openldap/-/commit/554dff1927176579d652f2fe60c90e9abbad4c65
https://git.openldap.org/openldap/openldap/-/commit/5a2017d4e61a6ddc4dcb4415028e0d08eb6bca26
https://git.openldap.org/openldap/openldap/-/commit/c0b61a9486508e5202aa2e0cfb68c9813731b439
https://git.openldap.org/openldap/openldap/-/commit/d169e7958a3e0dc70f59c8374bf8a59833b7bdd8
https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57
https://lists.debian.org/debian-lts-announce/2021/02/msg00005.html
https://www.debian.org/security/2021/dsa-4845

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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.