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.
CVSS Metrics
- Vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
- Attack Vector
- network
- Complexity
- high
- Privileges
- low
- User Action
- none
- Scope
- unchanged
- Confidentiality
- low
- Integrity
- low
- Availability
- low
- Weaknesses
- CWE-682
Metadata
- Primary Vendor
- LIBSSH
- Published
- 7/4/2025
- Last Modified
- 12/10/2025
- Source
- NIST NVD
- Note: Verify all details with official vendor sources before applying patches.
Affected Products
libssh : libsshredhat : openshift_container_platformredhat : enterprise_linuxredhat : enterprise_linuxredhat : enterprise_linuxredhat : enterprise_linuxredhat : enterprise_linux
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