CVE-2023-28862 Auth bypass in n/a

Critical 9.8 Published 31 Mar 2023 Updated 14 Feb 2025

Attackers can bypass two-factor authentication in LemonLDAP::NG due to weak session ID generation and incorrect password check failure handling.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2023-28862?

CVE-2023-28862 is a critical authentication bypass vulnerability in n/a, published on 31 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in LemonLDAP::NG before 2.16.1. Weak session ID generation in the AuthBasic handler and incorrect failure handling during a password check allow attackers to bypass 2FA verification. Any plugin that tries to deny session creation after the store step does not deny an AuthBasic session.

Weakness: CWE-287

Which versions are affected by CVE-2023-28862?

It affects 1 product.

Products include Lemonldap-Ng Lemonldap\.

How do I fix CVE-2023-28862?

Upgrade to a fixed version.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2023-28862 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-28862 exists.

Sources

Also known as DEBIAN-CVE-2023-28862, DLA-3496-1, GHSA-r74q-xwhp-q6r9, UBUNTU-CVE-2023-28862.