Debian update for openldap

1) Reachable Assertion

EUVDB-ID: #VU50779

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-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

Update openldap package to version 2.4.47+dfsg-3+deb10u6.

Vulnerable software versions

openldap (Debian package): 2.4.10-2+lenny1 - 2.4.56+dfsg-1

CPE2.3

• cpe:2.3:a:debian:openldap_debian_package:2.4.10-2 lenny1:*:*:*:*:debian_linux:*:*
• cpe:2.3:a:debian:openldap_debian_package:2.4.10-2:*:*:*:*:debian_linux:*:*
• cpe:2.3:a:debian:openldap_debian_package:2.4.10-3:*:*:*:*:debian_linux:*:*

External links

https://www.debian.org/security/2021/dsa-4860

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.