#VU50390 Reachable Assertion in OpenLDAP


Published: 2021-01-26 | Updated: 2021-02-06

Vulnerability identifier: #VU50390

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

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


External links
http://bugs.openldap.org/show_bug.cgi?id=9406
http://bugs.openldap.org/show_bug.cgi?id=9407
http://git.openldap.org/openldap/openldap/-/commit/02dfc32d658fadc25e4040f78e36592f6e1e1ca0
http://git.openldap.org/openldap/openldap/-/commit/6ed057b5b728b50746c869bcc9c1f85d0bbbf6ed
http://git.openldap.org/openldap/openldap/-/commit/6ed057b5b728b50746c869bcc9c1f85d0bbbf6ed.aa
http://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57
http://lists.debian.org/debian-lts-announce/2021/02/msg00005.html
http://www.debian.org/security/2021/dsa-4845


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.


Latest bulletins with this vulnerability