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.

• CWE-287
• CWE-287

• http://packetstormsecurity.com/files/172861/libssh-0.9.6-0.10.4-pki_verify_data_signature-Authorization-Bypass.html
• https://access.redhat.com/security/cve/CVE-2023-2283Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2189736Issue Tracking, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/27PD44ALQTZXX7K6JAM3BXBUHYA6DFFN/
• https://security.gentoo.org/glsa/202312-05
• https://security.netapp.com/advisory/ntap-20240201-0005/
• https://www.libssh.org/security/advisories/CVE-2023-2283.txtVendor Advisory
• 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-2023-2283Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2189736Issue Tracking, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/27PD44ALQTZXX7K6JAM3BXBUHYA6DFFN/
• https://security.gentoo.org/glsa/202312-05
• https://security.netapp.com/advisory/ntap-20240201-0005/
• https://www.libssh.org/security/advisories/CVE-2023-2283.txtVendor Advisory

Published

May 26, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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