Reachable Assertion in openldap (Alpine package)

1) Reachable Assertion

EUVDB-ID: #VU48515

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-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 update from vendor's website.

Vulnerable software versions

openldap (Alpine package): 2.4.24-r0 - 2.4.56-r0

CPE2.3

• cpe:2.3:o:alpine:openldap_alpine_package:2.4.24-r0:*:*:*:*:alpine_linux:*:2.1
• cpe:2.3:o:alpine:openldap_alpine_package:2.4.24-r1:*:*:*:*:alpine_linux:*:2.1
• cpe:2.3:o:alpine:openldap_alpine_package:2.4.24-r2:*:*:*:*:alpine_linux:*:2.1

External links

https://git.alpinelinux.org/aports/commit/?id=14d739b8cb4d55b4740d6b00583bfb451a13d5a1

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.