Description
A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values where OpenSSL uses 0 to indicate failure and libssh uses 0 for success—the function may mistakenly return a success status even when key derivation fails. This results in uninitialized cryptographic key buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality, integrity, and availability.
Problem types
Product status
Any version before 0.11.2
0:0.9.6-16.el8_10 (rpm) before *
0:0.9.6-16.el8_10 (rpm) before *
0:0.9.6-3.el9_0.2 (rpm) before *
Timeline
| 2025-05-30: | Reported to Red Hat. |
| 2025-06-24: | Made public. |
References
access.redhat.com/errata/RHSA-2025:21977 (RHSA-2025:21977)
access.redhat.com/errata/RHSA-2025:23024 (RHSA-2025:23024)
access.redhat.com/security/cve/CVE-2025-5372
bugzilla.redhat.com/show_bug.cgi?id=2369388 (RHBZ#2369388)