CVE-2018-0733 : Security Advisory and Response

A vulnerability in the implementation of the PA-RISC CRYPTO_memcmp function in OpenSSL affects HP-UX PA-RISC targets, allowing attackers to forge messages.

Understanding CVE-2018-0733

This CVE entry describes a security vulnerability in OpenSSL that impacts HP-UX PA-RISC targets.

What is CVE-2018-0733?

The bug in the PA-RISC CRYPTO_memcmp function limits its functionality to comparing only the least significant bit of each byte. This flaw enables malicious actors to create forged messages that can be mistakenly validated with fewer attempts than expected.

The Impact of CVE-2018-0733

The vulnerability affects HP-UX PA-RISC targets, compromising the integrity of cryptographic operations and potentially leading to unauthorized access or data manipulation.

Technical Details of CVE-2018-0733

This section provides detailed technical information about the CVE.

Vulnerability Description

The bug in the CRYPTO_memcmp function allows attackers to bypass security measures by forging messages with reduced validation requirements.

Affected Systems and Versions

Product: OpenSSL
Vendor: OpenSSL
Versions Affected: Fixed in OpenSSL 1.1.0h (Affected versions 1.1.0 to 1.1.0g)

Exploitation Mechanism

Attackers exploit the limited functionality of the CRYPTO_memcmp function to create forged messages that can bypass security validations.

Mitigation and Prevention

Protecting systems from CVE-2018-0733 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update OpenSSL to version 1.1.0h or later to mitigate the vulnerability.
Monitor for any unusual activities or unauthorized access attempts.

Long-Term Security Practices

Regularly update software and apply security patches to prevent future vulnerabilities.
Conduct security audits and penetration testing to identify and address potential weaknesses.

Patching and Updates

Stay informed about security advisories and updates from OpenSSL and other relevant sources to apply patches promptly.