CVE-2020-14967 : Vulnerability Insights and Analysis

An issue was discovered in the jsrsasign package before 8.0.18 for Node.js. Its RSA PKCS1 v1.5 decryption implementation does not detect ciphertext modification by prepending '\0' bytes to ciphertexts, allowing attackers to potentially trigger memory corruption issues.

Understanding CVE-2020-14967

This CVE identifies a vulnerability in the jsrsasign package that could be exploited by attackers to manipulate ciphertexts.

What is CVE-2020-14967?

The vulnerability in the RSA PKCS1 v1.5 decryption implementation of the jsrsasign package allows attackers to modify ciphertexts without detection, potentially leading to memory corruption.

The Impact of CVE-2020-14967

The vulnerability could be exploited by attackers to manipulate ciphertexts, potentially leading to memory corruption issues and security breaches.

Technical Details of CVE-2020-14967

The technical details of the vulnerability in the jsrsasign package.

Vulnerability Description

The RSA PKCS1 v1.5 decryption implementation in the jsrsasign package fails to detect ciphertext modification by prepending '\0' bytes, enabling attackers to trigger memory corruption.

Affected Systems and Versions

Product: N/A
Vendor: N/A
Versions affected: < 8.0.18

Exploitation Mechanism

Attackers can prepend '\0' bytes to ciphertexts to exploit the vulnerability and potentially trigger memory corruption issues.

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2020-14967.

Immediate Steps to Take

Update the jsrsasign package to version 8.0.18 or later.
Monitor for any unusual activity that could indicate exploitation of the vulnerability.

Long-Term Security Practices

Regularly update software packages to the latest versions to patch known vulnerabilities.
Implement encryption mechanisms that are resistant to known attacks.

Patching and Updates

Apply patches and updates provided by the jsrsasign package maintainers to address the vulnerability and enhance security measures.