Denial of service in OpenLDAP



Published: 2021-02-17 | Updated: 2021-03-23
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-27212
CWE-ID CWE-617
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe
OpenLDAP
Server applications / Directory software, identity management

Vendor OpenLDAP.org

Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

Updated: 23.03.2021

Changed bulletin status to patched.

1) Reachable Assertion

EUVDB-ID: #VU50779

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2021-27212

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a reachable assertion when processing LDAP packets within the issuerAndThisUpdateCheck() function in  schema_init.c. A remote attacker can send a specially crafted packet with a short timestamp to the slapd and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

OpenLDAP: 2.4 - 2.4.57


CPE2.3 External links

http://bugs.openldap.org/show_bug.cgi?id=9454
http://git.openldap.org/openldap/openldap/-/commit/3539fc33212b528c56b716584f2c2994af7c30b0
http://git.openldap.org/openldap/openldap/-/commit/9badb73425a67768c09bcaed1a9c26c684af6c30

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?



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