Learn about CVE-2021-21278, a vulnerability in RSSHub allowing code injection. Discover its impact, affected systems, exploitation, and mitigation strategies.
RSSHub is an open source, easy to use, and extensible RSS feed generator. In RSSHub before version 7f1c430, there is a risk of code injection. Some routes use
eval
or Function constructor
, which may be injected by the target site with unsafe code, causing server-side security issues. The fix in version 7f1c430 is to temporarily remove the problematic route and add a no-new-func
rule to eslint.
Understanding CVE-2021-21278
This section details the impact, technical aspects, and mitigation strategies related to the risk of code injection in RSSHub.
What is CVE-2021-21278?
CVE-2021-21278 pertains to the vulnerability in RSSHub that allows code injection due to the use of
eval
or Function constructor
in certain routes.
The Impact of CVE-2021-21278
The vulnerability has a CVSS base score of 8.6 (High severity) with a high impact on confidentiality. It can lead to server-side security issues when targeted with unsafe code injection.
Technical Details of CVE-2021-21278
This section provides a deeper insight into the vulnerability, affected systems, and the exploitation mechanism.
Vulnerability Description
The risk of code injection lies in RSSHub's utilization of certain routes that permit the injection of unsafe code, compromising server security.
Affected Systems and Versions
RSSHub versions prior to 7f1c430 are affected by this vulnerability, leaving them prone to code injection attacks.
Exploitation Mechanism
The vulnerability can be exploited by injecting malicious code via the
eval
or Function constructor
within specific routes in RSSHub.
Mitigation and Prevention
To prevent exploitation and secure systems, immediate steps and long-term security practices are crucial.
Immediate Steps to Take
Users should update RSSHub to version 7f1c430 or newer to mitigate the risk of code injection. Additionally, reviewing and securing server configurations is recommended.
Long-Term Security Practices
Implementing secure development practices, code reviews, and regular security audits are essential for maintaining robust application security.
Patching and Updates
Regularly applying patches and updates released by RSSHub, along with monitoring security advisories, can help in staying resilient against potential vulnerabilities.