Denial of Service Vulnerability in libspring-java Package: CVE-2024-38809
Summary
UBUNTU-CVE-2024-38809: Applications that parse ETags from "If-Match" or "If-None-Match" request headers are vulnerable to DoS attack. Affects libspring-java versions 3.0.6.RELEASE-10 – 3.0.6.RELEASE-9. No fix is published. How to fix ↓
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Background
The libspring-java package is a core component of the Spring Framework, which is widely used for building Java applications. It provides comprehensive infrastructure support for developing Java applications, including features for dependency injection, aspect-oriented programming, and transaction management. The package is essential for developers who leverage Spring's capabilities to create robust and scalable applications. However, it has been identified to have a vulnerability that could lead to denial of service (DoS) attacks, affecting the stability and availability of applications relying on it.
Vulnerability Detail
The vulnerability, identified as CVE-2024-38809, arises from the way applications parse ETags from the 'If-Match' or 'If-None-Match' request headers. This flaw can be exploited by attackers to send specially crafted requests that could overwhelm the server, leading to a denial of service. The potential ramifications include application downtime, degraded performance, and an overall negative impact on user experience. The vulnerability is classified with a CVSS score of 5.3, indicating a medium severity level.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users of affected versions can enforce a size limit on the 'If-Match' and 'If-None-Match' headers. This can be achieved by implementing a filter in the application code that checks the size of these headers before processing them. For example:
public class HeaderSizeFilter implements Filter {
private static final int MAX_HEADER_SIZE = 1024; // Set your size limit here
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest httpRequest = (HttpServletRequest) request;
String ifMatch = httpRequest.getHeader("If-Match");
String ifNoneMatch = httpRequest.getHeader("If-None-Match");
if ((ifMatch != null && ifMatch.length() > MAX_HEADER_SIZE) || (ifNoneMatch != null && ifNoneMatch.length() > MAX_HEADER_SIZE)) {
response.getWriter().write("Header size limit exceeded");
return;
}
chain.doFilter(request, response);
}
}
Conclusion
The CVE-2024-38809 vulnerability in the libspring-java package poses a risk of denial of service attacks. It is crucial for users to upgrade to the patched version to mitigate this risk. Implementing temporary workarounds can help protect applications until an upgrade is feasible. Regular monitoring for vulnerabilities using tools like Vulert can enhance security posture.
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FAQ
CVE-2024-38809 is a vulnerability in the libspring-java package that allows attackers to exploit ETags in request headers, potentially leading to denial of service.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The CVSS score of CVE-2024-38809 is 5.3, indicating a medium severity level.
If an immediate upgrade is not possible, consider implementing a size limit on the 'If-Match' and 'If-None-Match' headers as a temporary workaround.
More information about the libspring-java package can be found in the official Spring Framework documentation and the Ubuntu package repository.
References
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