#VU50390 Reachable Assertion in OpenLDAP - CVE-2020-36222

Vulnerability identifier: #VU50390

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-2020-36222

CWE-ID: CWE-617

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 a reachable assertion in slapd in the saslAuthzTo validation. A remote attacker can send a specially crafted request 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=9406
https://bugs.openldap.org/show_bug.cgi?id=9407
https://git.openldap.org/openldap/openldap/-/commit/02dfc32d658fadc25e4040f78e36592f6e1e1ca0
https://git.openldap.org/openldap/openldap/-/commit/6ed057b5b728b50746c869bcc9c1f85d0bbbf6ed
https://git.openldap.org/openldap/openldap/-/commit/6ed057b5b728b50746c869bcc9c1f85d0bbbf6ed.aa
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.