CVE-2015-8857: Uglify-js Package JavaScript Expression Rewriting Vulnerability
Summary
CVE-2015-8857: The uglify-js package before 2.4.24 for Node.js does not properly account for non-boolean values when rewriting boolean expressions, which might allow attackers to bypass security mechanisms or possibly have unspecified... Affects uglifyjs versions < 2.7.4-1. Fixed in 2.7.4-1. How to fix ↓
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Background
The uglify-js package is a JavaScript parser, minifier, and compressor for Node.js. It is commonly used to reduce the size of JavaScript files and improve website performance. The package works by parsing JavaScript code and applying various optimizations, including rewriting boolean expressions. However, prior to version 2.4.24, the package did not properly handle non-boolean values during expression rewriting, potentially leading to security bypasses or other unspecified impacts when the rewritten JavaScript is executed.
Vulnerability Detail
The vulnerability (CVE-2015-8857) in the uglify-js package arises from its improper handling of non-boolean values during the rewriting of boolean expressions. This flaw can be exploited by attackers to bypass security mechanisms or potentially cause other unknown impacts by leveraging the improperly rewritten JavaScript. The specific technical details of the vulnerability can be found in the provided source link.
How To Fix
Minimum fixed version
2.7.4-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade uglifyjsTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a workaround, developers can manually review and modify the JavaScript code to ensure that boolean expressions are properly handled and rewritten. This may involve inspecting the code for instances where non-boolean values are used in boolean expressions and applying appropriate modifications to ensure correct behavior. However, applying the official package update is the recommended solution.
Conclusion
The CVE-2015-8857 vulnerability in the uglify-js package exposes a weakness in its handling of non-boolean values during expression rewriting. This flaw can potentially be exploited to bypass security mechanisms or cause other impacts. It is crucial to update the package to version 2.7.4-1 or later to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can potentially allow attackers to bypass security mechanisms or cause other unspecified impacts by leveraging improperly rewritten JavaScript.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities without requiring access to the code or installation.
Yes, the CVSS score for this vulnerability is 9.8, indicating a critical severity level.
Specific known exploits for this vulnerability have not been disclosed in the provided information. However, it is important to promptly update the affected package to mitigate the risk of potential exploitation.
You can find more information about this vulnerability, including technical details and the source link, in the provided database-specific source link.
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