Vulnerability identifier: #VU84792
Vulnerability risk: Low
CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2023-51384
CWE-ID:
CWE-326
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
OpenSSH
Server applications /
Remote management servers, RDP, SSH
Vendor: OpenSSH
Description
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to an error in the ssh-agent, which causes certain destination constraints to be incompletely applied. When destination constraints are specified during addition of PKCS#11-hosted private keys, these constraints are only applied to the first key, even if a PKCS#11 token returns multiple keys.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
OpenSSH: 9.0p1 - 9.5p1
External links
https://www.openssh.com/txt/release-9.6
https://www.openwall.com/lists/oss-security/2023/12/18/2
https://github.com/openssh/openssh-portable/commit/881d9c6af9da4257c69c327c4e2f1508b2fa754b
https://www.debian.org/security/2023/dsa-5586
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.