CVE-2021-41250 : What You Need to Know

Python Discord bot versions prior to commit 67390298852513d13e0213870e50fb3cff1424e0 are affected by a vulnerability that allows bypassing moderation filters by including non-blacklisted URLs.

Understanding CVE-2021-41250

This CVE identifies a bypass vulnerability in Python Discord bot versions that could potentially lead to the evasion of moderation filters.

What is CVE-2021-41250?

The presence of a non-blacklisted URL in combination with a specific triggering filter token in the same message can evade token filters, allowing moderation filters to be bypassed.

The Impact of CVE-2021-41250

The CVSS base score for this CVE is 4.3, categorizing it as a medium severity issue. The vulnerability has low integrity impact but could compromise the effectiveness of moderation filters.

Technical Details of CVE-2021-41250

Python Discord bot vulnerability details and exploitation mechanisms.

Vulnerability Description

The vulnerability stems from the failure of token filters to trigger when a non-blacklisted URL and a specific token are present in a message, enabling filter bypass.

Affected Systems and Versions

Product: Python Discord bot
Vendor: python-discord
Affected Version: < 67390298852513d13e0213870e50fb3cff1424e0

Exploitation Mechanism

The vulnerability can be exploited by including a non-blacklisted URL along with a triggered filter token in the same message.

Mitigation and Prevention

Steps to address the CVE-2021-41250 vulnerability.

Immediate Steps to Take

Update to commit 67390298852513d13e0213870e50fb3cff1424e0 or later to mitigate the vulnerability.
Regularly review and update blacklisted URLs to enhance the effectiveness of moderation filters.

Long-Term Security Practices

Implement comprehensive input validation mechanisms to prevent similar filter bypass issues.
Conduct regular security assessments to identify and address any newly emerging vulnerabilities.

Patching and Updates

Ensure all software components, including dependencies, are regularly patched and updated to protect against known vulnerabilities.