Infinite Loop Vulnerability in haskell-xml-conduit Package
Summary
DEBIAN-CVE-2021-4249: A vulnerability was found in xml-conduit. Affects haskell-xml-conduit versions < 1.9.1.1-1. Fixed in 1.9.1.1-1. How to fix ↓
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Background
The haskell-xml-conduit package is a Haskell library designed for parsing and manipulating XML data. It provides a convenient interface for working with XML streams, making it easier for developers to handle XML in their applications. However, this package is susceptible to a specific vulnerability that can lead to an infinite loop, potentially affecting the stability and performance of applications that rely on it.
Vulnerability Detail
A vulnerability was identified in the xml-conduit library, specifically in the DOCTYPE Entity Expansion Handler function located in the file xml-conduit/src/Text/XML/Stream/Parse.hs. This vulnerability can be exploited to create an infinite loop, which may lead to denial of service by consuming system resources. The issue arises from improper handling of certain XML constructs, allowing an attacker to craft XML input that triggers this behavior. The vulnerability is classified as problematic and can be exploited remotely, making it critical for affected users to address it promptly.
How To Fix
Minimum fixed version
1.9.1.1-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade haskell-xml-conduitTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. The best course of action is to upgrade to the patched version as soon as possible.
Conclusion
The haskell-xml-conduit package has a critical vulnerability that can lead to infinite loops and denial of service. Users are strongly advised to upgrade to the patched version 1.9.1.1-1 to mitigate this risk. Regular monitoring for vulnerabilities using tools like Vulert can help maintain application security.
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FAQ
The vulnerability allows for an infinite loop due to improper handling of XML input, which can lead to denial of service.
You can use the Vulert playground at Vulert Scanner to check if your application is affected without needing to sign up.
Failure to address this vulnerability may result in application crashes or unresponsive behavior, impacting user experience and system stability.
Yes, upgrading to version 1.9.1.1-1 of the haskell-xml-conduit package addresses the vulnerability.
Yes, the vulnerability can be exploited remotely, making it essential for users to upgrade their packages promptly.
References
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