CVE-2021-30130 : What You Need to Know

A detailed overview of CVE-2021-30130 focusing on phpseclib mishandling RSA PKCS#1 v1.5 signature verification.

Understanding CVE-2021-30130

This section covers the impact, technical details, and mitigation strategies related to CVE-2021-30130.

What is CVE-2021-30130?

CVE-2021-30130 involves phpseclib versions before 2.0.31 and 3.x before 3.0.7, where it improperly handles RSA PKCS#1 v1.5 signature verification.

The Impact of CVE-2021-30130

The mishandling of RSA PKCS#1 v1.5 signature verification could lead to potential security vulnerabilities in affected systems, allowing attackers to exploit this weakness.

Technical Details of CVE-2021-30130

This section provides a deeper look into the vulnerability specifics, affected systems, and the exploitation mechanism.

Vulnerability Description

phpseclib versions before 2.0.31 and 3.x before 3.0.7 have a flaw in how they manage RSA PKCS#1 v1.5 signature verification, opening the door to potential attacks.

Affected Systems and Versions

All versions of phpseclib prior to 2.0.31 and 3.x before 3.0.7 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting specially designed RSA PKCS#1 v1.5 signatures to bypass authentication and potentially execute arbitrary code.

Mitigation and Prevention

In this section, you will find proactive measures to address and prevent the exploitation of CVE-2021-30130.

Immediate Steps to Take

Users are advised to update phpseclib to version 2.0.31 or 3.0.7 to mitigate the security risks associated with this vulnerability.

Long-Term Security Practices

Maintaining up-to-date software versions, implementing secure coding practices, and conducting regular security audits can help enhance overall system security.

Patching and Updates

Regularly check for security updates and patches released by phpseclib to address vulnerabilities and improve system security.