Security update for libssh SUSE Patch security@suse.de SUSE Security Team SUSE-SU-2025:20596-1 Final 1 1 2025-08-14T10:19:26Z current 2025-08-14T10:19:26Z 2025-08-14T10:19:26Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for libssh This update for libssh fixes the following issues: - CVE-2025-5372: ssh_kdf() returns a success code on certain failures (bsc#1245314) - CVE-2025-5987: Invalid return code for chacha20 poly1305 with OpenSSL backend (bsc#1245317) - CVE-2025-4877: Write beyond bounds in binary to base64 conversion functions (bsc#1245309) - CVE-2025-4878: Use of uninitialized variable in privatekey_from_file() (bsc#1245310) - CVE-2025-5318: Likely read beyond bounds in sftp server handle management (bsc#1245311) - CVE-2025-5351: Double free in functions exporting keys (bsc#1245312) The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). SUSE-SLE-Micro-6.1-213 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/update/announcement/2025/suse-su-202520596-1/ Link for SUSE-SU-2025:20596-1 https://lists.suse.com/pipermail/sle-security-updates/2025-August/022366.html E-Mail link for SUSE-SU-2025:20596-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1245309 SUSE Bug 1245309 https://bugzilla.suse.com/1245310 SUSE Bug 1245310 https://bugzilla.suse.com/1245311 SUSE Bug 1245311 https://bugzilla.suse.com/1245312 SUSE Bug 1245312 https://bugzilla.suse.com/1245314 SUSE Bug 1245314 https://bugzilla.suse.com/1245317 SUSE Bug 1245317 https://www.suse.com/security/cve/CVE-2025-4877/ SUSE CVE CVE-2025-4877 page https://www.suse.com/security/cve/CVE-2025-4878/ SUSE CVE CVE-2025-4878 page https://www.suse.com/security/cve/CVE-2025-5318/ SUSE CVE CVE-2025-5318 page https://www.suse.com/security/cve/CVE-2025-5351/ SUSE CVE CVE-2025-5351 page https://www.suse.com/security/cve/CVE-2025-5372/ SUSE CVE CVE-2025-5372 page https://www.suse.com/security/cve/CVE-2025-5987/ SUSE CVE CVE-2025-5987 page SUSE Linux Micro 6.1 libssh-config-0.10.6-slfo.1.1_2.1 libssh4-0.10.6-slfo.1.1_2.1 libssh-config-0.10.6-slfo.1.1_2.1 as a component of SUSE Linux Micro 6.1 libssh4-0.10.6-slfo.1.1_2.1 as a component of SUSE Linux Micro 6.1 There's a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can experience an integer overflow leading to a memory under allocation, when that happens it's possible that the program perform out of bounds write leading to a heap corruption. This issue affects only 32-bits builds of libssh. CVE-2025-4877 SUSE Linux Micro 6.1:libssh-config-0.10.6-slfo.1.1_2.1 SUSE Linux Micro 6.1:libssh4-0.10.6-slfo.1.1_2.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-202520596-1/ https://www.suse.com/security/cve/CVE-2025-4877.html CVE-2025-4877 https://bugzilla.suse.com/1245309 SUSE Bug 1245309 A vulnerability was found in libssh, where an uninitialized variable exists under certain conditions in the privatekey_from_file() function. This flaw can be triggered if the file specified by the filename doesn't exist and may lead to possible signing failures or heap corruption. CVE-2025-4878 SUSE Linux Micro 6.1:libssh-config-0.10.6-slfo.1.1_2.1 SUSE Linux Micro 6.1:libssh4-0.10.6-slfo.1.1_2.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-202520596-1/ https://www.suse.com/security/cve/CVE-2025-4878.html CVE-2025-4878 https://bugzilla.suse.com/1245310 SUSE Bug 1245310 A flaw was found in the libssh library. An out-of-bounds read can be triggered in the sftp_handle function due to an incorrect comparison check that permits the function to access memory beyond the valid handle list and to return an invalid pointer, which is used in further processing. This vulnerability allows an authenticated remote attacker to potentially read unintended memory regions, exposing sensitive information or affect service behavior. CVE-2025-5318 SUSE Linux Micro 6.1:libssh-config-0.10.6-slfo.1.1_2.1 SUSE Linux Micro 6.1:libssh4-0.10.6-slfo.1.1_2.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-202520596-1/ https://www.suse.com/security/cve/CVE-2025-5318.html CVE-2025-5318 https://bugzilla.suse.com/1245311 SUSE Bug 1245311 A flaw was found in the key export functionality of libssh. The issue occurs in the internal function responsible for converting cryptographic keys into serialized formats. During error handling, a memory structure is freed but not cleared, leading to a potential double free issue if an additional failure occurs later in the function. This condition may result in heap corruption or application instability in low-memory scenarios, posing a risk to system reliability where key export operations are performed. CVE-2025-5351 SUSE Linux Micro 6.1:libssh-config-0.10.6-slfo.1.1_2.1 SUSE Linux Micro 6.1:libssh4-0.10.6-slfo.1.1_2.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-202520596-1/ https://www.suse.com/security/cve/CVE-2025-5351.html CVE-2025-5351 https://bugzilla.suse.com/1245312 SUSE Bug 1245312 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. CVE-2025-5372 SUSE Linux Micro 6.1:libssh-config-0.10.6-slfo.1.1_2.1 SUSE Linux Micro 6.1:libssh4-0.10.6-slfo.1.1_2.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-202520596-1/ https://www.suse.com/security/cve/CVE-2025-5372.html CVE-2025-5372 https://bugzilla.suse.com/1245314 SUSE Bug 1245314 A flaw was found in libssh when using the ChaCha20 cipher with the OpenSSL library. If an attacker manages to exhaust the heap space, this error is not detected and may lead to libssh using a partially initialized cipher context. This occurs because the OpenSSL error code returned aliases with the SSH_OK code, resulting in libssh not properly detecting the error returned by the OpenSSL library. This issue can lead to undefined behavior, including compromised data confidentiality and integrity or crashes. CVE-2025-5987 SUSE Linux Micro 6.1:libssh-config-0.10.6-slfo.1.1_2.1 SUSE Linux Micro 6.1:libssh4-0.10.6-slfo.1.1_2.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-202520596-1/ https://www.suse.com/security/cve/CVE-2025-5987.html CVE-2025-5987 https://bugzilla.suse.com/1245317 SUSE Bug 1245317