XML External Entity (XXE) Vulnerability in libspring-java: Potential File Access and Denial of Service
Summary
CVE-2013-6429: The SourceHttpMessageConverter in Spring MVC in Spring Framework before 3.2.5 and 4.0.0.M1 through 4.0.0.RC1 does not disable external entity resolution, which allows remote attackers to read arbitrary files, cause a den... Affects libspring-java versions < 3.0.6.RELEASE-11. Fixed in 3.0.6.RELEASE-11. How to fix ↓
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Background
libspring-java is a core component of the Spring Framework, widely used for building Java applications. It provides comprehensive infrastructure support for developing Java applications, including web applications. The framework is known for its flexibility, ease of use, and extensive features, such as dependency injection and aspect-oriented programming. However, certain versions of libspring-java are vulnerable to XML External Entity (XXE) attacks, which can lead to unauthorized file access and denial of service.
Vulnerability Detail
The vulnerability arises from the SourceHttpMessageConverter in Spring MVC, which does not disable external entity resolution in versions prior to 3.2.5 and 4.0.0.M1 through 4.0.0.RC1. This oversight allows remote attackers to exploit crafted XML payloads to read arbitrary files on the server, potentially leading to sensitive data exposure, denial of service, and Cross-Site Request Forgery (CSRF) attacks. The issue is classified as an XML External Entity (XXE) vulnerability, which is a common security flaw in XML parsers.
How To Fix
Minimum fixed version
3.0.6.RELEASE-11
This is the first release that contains the fix.
sudo apt-get install --only-upgrade libspring-javaTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If upgrading is not immediately possible, consider disabling external entity processing in your XML parser configuration. This can typically be done by modifying the parser settings to prevent the resolution of external entities. For example, in Java, you can configure the XML parser as follows:
import javax.xml.parsers.DocumentBuilderFactory;
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setFeature("http://xml.org/sax/features/external-general-entities", false);
factory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
This code snippet disables the processing of external entities.
Conclusion
The CVE-2013-6429 vulnerability in libspring-java poses significant risks, including unauthorized file access and denial of service. It is crucial to upgrade to a secure version or implement workarounds to mitigate these risks. Utilizing tools like Vulert can help monitor and manage vulnerabilities effectively.
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FAQ
An XXE attack occurs when an XML parser processes external entities, allowing attackers to read files on the server or perform denial of service attacks.
Versions of libspring-java prior to 3.2.5 and between 4.0.0.M1 and 4.0.0.RC1 are vulnerable.
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Exploitation of this vulnerability can lead to unauthorized file access, denial of service, and CSRF attacks, compromising the security of your application.
If an immediate upgrade is not feasible, implement workarounds by disabling external entity processing in your XML parser configuration.
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