Improper Authentication in OpenSSH - CVE-2023-51767
Published: May 16, 2024
Vulnerability identifier: #VU89587
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2023-51767
CWE-ID: CWE-287
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: OpenSSH
Affected software:
OpenSSH
OpenSSH
Detailed vulnerability description
The vulnerability allows a local user to bypass authentication process.
The vulnerability exists due to an error in when processing authentication requests. A local user can bypass authentication process and gain unauthorized access to the application by conducting a row hammer attack against the mm_answer_authpassword integer value to flip a single bit.
How to mitigate CVE-2023-51767
Install updates from vendor's website.
Sources
- https://arxiv.org/abs/2309.02545
- https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/monitor.c#L878
- https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/auth-passwd.c#L77
- https://bugzilla.redhat.com/show_bug.cgi?id=2255850
- https://access.redhat.com/security/cve/CVE-2023-51767
- https://ubuntu.com/security/CVE-2023-51767
- https://security.netapp.com/advisory/ntap-20240125-0006/