vulnerability
Ubuntu: USN-7619-1 (CVE-2025-5372): libssh vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 6 | (AV:N/AC:M/Au:S/C:P/I:P/A:P) | Jul 4, 2025 | Jul 8, 2025 | Mar 27, 2026 |
Severity
6
CVSS
(AV:N/AC:M/Au:S/C:P/I:P/A:P)
Published
Jul 4, 2025
Added
Jul 8, 2025
Modified
Mar 27, 2026
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.
Solution
ubuntu-upgrade-libssh-4
References
- CVE-2025-5372
- https://attackerkb.com/topics/CVE-2025-5372
- CWE-682
- EUVD-EUVD-2025-19931
- UBUNTU-USN-7619-1
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-19931
- https://ubuntu.com/security/notices/USN-7619-1
- https://www.cve.org/CVERecord?id=CVE-2025-5372
- https://www.libssh.org/security/advisories/CVE-2025-5372.txt
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