Vulnerability identifier: #VU48515

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-2020-25710

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 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

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

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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.