Critical Availability Attack Vulnerability in node-katex: Untrusted Input Handling
Summary
DEBIAN-CVE-2024-28243: KaTeX is a JavaScript library for TeX math rendering on the web. Affects node-katex versions < 0.16.10+~cs6.1.0-1. Fixed in 0.16.10+~cs6.1.0-1. How to fix ↓
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Background
node-katex is a JavaScript library designed for rendering TeX math expressions on the web. It allows users to display complex mathematical formulas in a visually appealing manner. However, this package has been found to be vulnerable to a specific issue where untrusted mathematical expressions can lead to denial of service due to improper handling of certain commands.
Vulnerability Detail
The vulnerability arises from the way node-katex processes untrusted input, particularly with the \edef command. When users render mathematical expressions that include this command, it can trigger a near-infinite loop, even if the maxExpand setting is configured to prevent such scenarios. This can result in significant resource consumption, leading to memory overflow, tying up the main thread, or causing a stack overflow. Consequently, this vulnerability poses a risk of availability attacks, where users may find themselves unable to access the site due to the excessive resource usage caused by malicious input.
How To Fix
Minimum fixed version
0.16.10+~cs6.1.0-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade node-katexTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can implement input validation to sanitize mathematical expressions before rendering them with node-katex. This can help mitigate the risk of malicious input causing resource exhaustion.
Conclusion
The vulnerability in node-katex poses a significant risk by allowing untrusted input to cause denial of service. Users are advised to upgrade to the patched version to secure their applications. Implementing input validation can serve as a temporary workaround until the upgrade is completed.
See every vulnerability recorded for node-katex →
FAQ
The vulnerability allows untrusted mathematical expressions to cause denial of service through resource exhaustion.
You can check if your application is affected by using Vulert, which monitors open-source vulnerabilities in real-time based on your manifest file.
If an immediate upgrade is not possible, implement input validation to sanitize user inputs as a temporary measure.
Yes, you can update node-katex by running 'sudo apt-get install node-katex=0.16.10+~cs6.1.0-1' in your terminal.
More information can be found in the official Debian CVE database or by visiting the Vulert website.
References
Related vulnerabilities
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