CVE-2023-2283
A vulnerability was found in libssh, where the authentication check of the connecting client can be bypassed in the`pki_verify_data_signature` function in memory allocation problems. This issue may happen if there is insufficient memory or the memory usage is limited. The problem is caused by the return value `rc,` which is initialized to SSH_ERROR and later rewritten to save the return value of the function call `pki_key_check_hash_compatible.` The value of the variable is not changed between this point and the cryptographic verification. Therefore any error between them calls `goto error` returning SSH_OK.
02 / AFFECTED SOFTWARE
Affected packages
10 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
A vulnerability was found in libssh, where the authentication check of the connecting client can be bypassed in the`pki_verify_data_signature` function in memory allocation problems. This issue may happen if there is insufficient memory or the memory usage is limited. The problem is caused by the return value `rc,` which is initialized to SSH_ERROR and later rewritten to save the return value of the function call `pki_key_check_hash_compatible.` The value of the variable is not changed between this point and the cryptographic verification. Therefore any error between them calls `goto error` returning SSH_OK.
05 / REFERENCES
Further evidence
- http://packetstormsecurity.com/files/172861/libssh-0.9.6-0.10.4-pki_verify_data_signature-Authorization-Bypass.html
- http://seclists.org/fulldisclosure/2025/Feb/18
- https://access.redhat.com/security/cve/CVE-2023-2283
- https://bugzilla.redhat.com/show_bug.cgi?id=2189736
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/2xxx/CVE-2023-2283.json
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/27PD44ALQTZXX7K6JAM3BXBUHYA6DFFN/
- https://nvd.nist.gov/vuln/detail/CVE-2023-2283
- https://security.gentoo.org/glsa/202312-05
- https://security.netapp.com/advisory/ntap-20240201-0005/
- https://www.libssh.org/security/advisories/CVE-2023-2283.txt