Multiple vulnerabilities in OpenLDAP

Published: 2020-11-18

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-25710 CVE-2020-25709
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 2 vulnerabilities.

1) Reachable Assertion

EUVDB-ID: #VU48515

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-2020-25710

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 requests in slapd within the csnNormalize23() function in schema_init.c. A remote attacker can send a specially crafted packet to the server, trigger an assertion failure and crash the daemon.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

OpenLDAP: 2.4.8 - 2.4.55

External links

http://bugs.openldap.org/show_bug.cgi?id=9384
http://git.openldap.org/openldap/openldap/-/commit/bdb0d459187522a6063df13871b82ba8dcc6efe2

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.

2) Reachable Assertion

EUVDB-ID: #VU48516