CVE-2023-51384 : Exploit Details and Defense Strategies
Learn about CVE-2023-51384 affecting OpenSSH versions before 9.6. Understand the impact, technical details, and mitigation steps to secure systems from incomplete destination constraints vulnerability.
In ssh-agent in OpenSSH before 9.6, certain destination constraints can be incompletely applied. Learn about the impact, technical details, and mitigation steps for this vulnerability.
Understanding CVE-2023-51384
Known as a vulnerability in OpenSSH prior to version 9.6, this CVE allows incomplete application of destination constraints, posing a security risk.
What is CVE-2023-51384?
CVE-2023-51384 affects ssh-agent in OpenSSH versions before 9.6, where destination constraints are not fully implemented, leading to potential security issues.
The Impact of CVE-2023-51384
The vulnerability allows only the first key's constraints to be enforced, even if multiple keys are returned by a PKCS#11 token. Attackers could exploit this flaw to bypass intended restrictions.
Technical Details of CVE-2023-51384
Understand the specifics of the vulnerability, including the description, affected systems, and exploitation mechanism.
Vulnerability Description
In OpenSSH prior to version 9.6, destination constraints defined for PKCS#11-hosted private keys are applied only to the first key, rather than all keys returned by the PKCS#11 token.
Affected Systems and Versions
All versions of OpenSSH before 9.6 are impacted by CVE-2023-51384 due to incomplete application of destination constraints during key addition.
Exploitation Mechanism
By specifying destination constraints during key addition, an attacker could manipulate the system to bypass intended restrictions by enforcing constraints only on the first key.
Mitigation and Prevention
Discover the immediate steps and long-term security practices to safeguard systems from CVE-2023-51384.
Immediate Steps to Take
System administrators should update OpenSSH to version 9.6 or later to mitigate the vulnerability and ensure all destination constraints are properly applied.
Long-Term Security Practices
Regularly monitor for security updates and patches for OpenSSH to address potential vulnerabilities and enhance overall system security.
Patching and Updates
Stay informed about security advisories and updates from OpenSSH to promptly apply patches that address CVE-2023-51384 and other security issues.