CVE-2018-12434 : Exploit Details and Defense Strategies

A memory-cache side-channel attack, also known as the Return Of the Hidden Number Problem (ROHNP), can be performed on DSA and ECDSA signatures in LibreSSL versions earlier than 2.6.5 and 2.7.x versions prior to 2.7.4. In order to obtain a key, the attacker must have access to either the local machine or another virtual machine within the same physical host.

Understanding CVE-2018-12434

This CVE involves a memory-cache side-channel attack on DSA and ECDSA signatures in specific versions of LibreSSL.

What is CVE-2018-12434?

CVE-2018-12434, also known as ROHNP, allows attackers to exploit vulnerabilities in LibreSSL versions prior to 2.6.5 and 2.7.4 to perform memory-cache side-channel attacks on DSA and ECDSA signatures.

The Impact of CVE-2018-12434

This vulnerability could lead to unauthorized access to cryptographic keys by attackers with access to the local machine or a virtual machine on the same physical host.

Technical Details of CVE-2018-12434

This section provides more technical insights into the CVE.

Vulnerability Description

LibreSSL versions before 2.6.5 and 2.7.x before 2.7.4 are susceptible to memory-cache side-channel attacks on DSA and ECDSA signatures, allowing attackers to potentially retrieve cryptographic keys.

Affected Systems and Versions

Affected Systems: LibreSSL versions earlier than 2.6.5 and 2.7.x versions prior to 2.7.4

Exploitation Mechanism

Attackers need access to the local machine or another virtual machine on the same physical host to exploit this vulnerability.

Mitigation and Prevention

Protecting systems from CVE-2018-12434 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update LibreSSL to versions 2.6.5 or 2.7.4 to mitigate the vulnerability.
Restrict access to sensitive systems and cryptographic keys.

Long-Term Security Practices

Implement strong access controls and authentication mechanisms.
Regularly monitor and audit system activities for any suspicious behavior.

Patching and Updates

Regularly apply security patches and updates to ensure the latest security measures are in place.