Critical Vulnerability in Expat Package: Namespace URI Injection Risk
Summary
ALPINE-CVE-2022-25236: xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs. Affects expat versions < 2.2.10-r2. Fixed in 2.2.10-r2. How to fix ↓
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Background
Expat, also known as libexpat, is a widely used XML parsing library that provides a fast and efficient way to process XML data. It is utilized in various applications and systems for its ability to handle XML parsing tasks with ease. However, a critical vulnerability has been identified in versions prior to 2.4.5, which exposes applications using this library to potential security risks.
Vulnerability Detail
The vulnerability, identified as CVE-2022-25236, resides in the xmlparse.c file of the Expat library. It allows attackers to insert namespace-separator characters into namespace URIs, which can lead to XML parsing issues and potentially allow for XML External Entity (XXE) attacks. This vulnerability has a CVSS score of 9.8, indicating a high severity level, and can result in unauthorized access to sensitive data, data corruption, or denial of service.
How To Fix
Minimum fixed version
2.2.10-r2
This is the first release that contains the fix.
sudo apk add --upgrade expatTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate patching is not feasible, consider implementing input validation to sanitize namespace URIs before processing them with Expat. This can help mitigate the risk of exploitation until the package can be updated.
Conclusion
The vulnerability in the Expat package poses significant risks to applications that rely on it for XML parsing. It is essential to update to the patched versions to safeguard against potential attacks. Regular monitoring for vulnerabilities using tools like Vulert can help maintain application security.
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FAQ
CVE-2022-25236 is a critical vulnerability in the Expat XML parsing library that allows attackers to manipulate namespace URIs.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Exploitation of this vulnerability can lead to unauthorized data access, data corruption, or denial of service attacks.
The CVSS score of CVE-2022-25236 is 9.8, indicating a high severity level.
You can update the Expat package using the commands: apk update followed by apk add expat=2.4.5-r0.
References
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