CVE-2022-35920 : What You Need to Know

A detailed overview of CVE-2022-35920 affecting the Sanic web server/framework.

Understanding CVE-2022-35920

CVE-2022-35920 highlights an issue of improper limitation of a pathname to a restricted directory in the Sanic framework.

What is CVE-2022-35920?

Sanic, an open-source Python web server/framework, is impacted by CVE-2022-35920. It allows access to lateral directories when using

app.static

with encoded

%2F

URLs, although parent directory traversal remains unaffected.

The Impact of CVE-2022-35920

The vulnerability poses a high severity risk with a CVSS base score of 8.3. It can lead to limited confidentiality and integrity impacts with low availability impact.

Technical Details of CVE-2022-35920

Exploring the specifics of the vulnerability in Sanic.

Vulnerability Description

CVE-2022-35920 exposes a flaw where lateral directories can be accessed when utilizing

app.static

with specific encoded URLs, potentially compromising data integrity.

Affected Systems and Versions

Sanic versions >= 22.0.0 and < 22.6.1, >= 21.0.0 and < 21.12.2, and < 20.12.7 are known to be affected by this vulnerability.

Exploitation Mechanism

The vulnerability can be exploited by malicious actors leveraging encoded URLs to access unintended directories.

Mitigation and Prevention

Guidance on addressing and safeguarding against CVE-2022-35920.

Immediate Steps to Take

Users are strongly advised to upgrade to non-vulnerable versions of Sanic to mitigate the risk associated with CVE-2022-35920.

Long-Term Security Practices

Implement a proactive security approach by regularly updating software and monitoring for potential vulnerabilities.

Patching and Updates

Stay informed about security patches and updates released by Sanic to address identified vulnerabilities.