CVE-2023-41335 : What You Need to Know

Understanding CVE-2023-41335

What is CVE-2023-41335?

Synapse, an open-source Matrix homeserver maintained by the Matrix.org Foundation, temporarily stores plaintext passwords during password changes. This could lead to the inadvertent capture of passwords in database backups, although these passwords are automatically erased after 48 hours. The issue has been addressed in version 1.93.0, and users are advised to upgrade.

The Impact of CVE-2023-41335

The vulnerability could potentially expose passwords to unauthorized access if captured in database backups. While the passwords are automatically erased after 48 hours, there is a risk of exposure during that window. It is crucial for users to upgrade to version 1.93.0 to mitigate this risk.

Technical Details of CVE-2023-41335

Vulnerability Description

The vulnerability arises from the temporary storage of plaintext passwords during password changes in Synapse. Although the server already learns users' passwords during the authentication process, temporarily storing them could lead to exposure in database backups.

Affected Systems and Versions

The affected system is Synapse by matrix-org. Versions from >= 1.66.0 to < 1.93.0 are impacted by this vulnerability.

Exploitation Mechanism

Attackers could potentially exploit this vulnerability by accessing database backups where plaintext passwords are stored temporarily during password changes.

Mitigation and Prevention

Immediate Steps to Take

Users are strongly advised to upgrade to version 1.93.0 to address this vulnerability and prevent the inadvertent exposure of plaintext passwords. Additionally, it is essential to follow secure password management practices and avoid reusing passwords across multiple services.

Long-Term Security Practices

To enhance security in the long term, users should consider implementing strong password policies, multi-factor authentication, and regular security audits to identify and address any potential vulnerabilities.

Patching and Updates

Regularly updating Synapse to the latest version is crucial to stay protected against known vulnerabilities. Additionally, monitoring security advisories and promptly applying patches issued by the vendor can help prevent exploitation of vulnerabilities.