CVE-2021-43838: Vulnerability in jsx-slack - Insufficient Patch for ReDoS
Summary
CVE-2021-43843: jsx-slack insufficient patch for CVE-2021-43838 ReDoS. Affects jsx-slack versions < 4.5.2. Fixed in 4.5.2. How to fix ↓
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Background
jsx-slack is an npm package that provides a JSX-based syntax for generating Slack messages. It allows developers to create Slack message layouts using JSX syntax, making it easier to generate complex message structures. However, versions of jsx-slack up to v4.5.1 are vulnerable to a Regular Expression Denial of Service (ReDoS) attack. This vulnerability can be exploited by an attacker who can insert a large number of JSX elements into the <blockquote> tag, including multibyte characters.
Vulnerability Detail
The vulnerability in jsx-slack arises from an insufficient patch for CVE-2021-43838. The internal regular expression used for escaping characters in the <blockquote> tag can consume excessive computing resources when processing a large number of JSX elements with multibyte characters. This can lead to a denial of service situation where the application becomes unresponsive or crashes. The vulnerability affects jsx-slack versions up to v4.5.1.
How To Fix
Minimum fixed version
4.5.2
This is the first release that contains the fix.
npm install jsx-slack@4.5.2Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no known workaround for this vulnerability. It is recommended to update to the latest version of jsx-slack as soon as possible.
Conclusion
The vulnerability in jsx-slack (CVE-2021-43838) can lead to a denial of service situation if exploited. It is important to update to the latest version of jsx-slack (v4.5.2 or later) to mitigate this vulnerability. For further support on vulnerability remediation, you can contact DevNack.com.
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FAQ
If exploited, this vulnerability can cause a denial of service situation where the application becomes unresponsive or crashes.
Versions up to v4.5.1 of jsx-slack are affected by this vulnerability.
You can use the Vulert Playground at Vulert Scanner to check if your application is affected by this vulnerability. Simply provide your package-lock.json file and the Vulert Playground will analyze it for vulnerabilities in real-time.
There are no known public exploits for this vulnerability at the time of this report.
You can find more information about this vulnerability in the GitHub Security Advisory at https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q.
References
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