DoS Vulnerability in libspring-java: ETag Header Parsing Issue
Summary
DEBIAN-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 4.3.30-1 – 4.3.30-3. No fix is published. How to fix ↓
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Background
libspring-java is a Java framework that provides comprehensive support for developing Java applications. It is widely used for building web applications and services, offering features such as dependency injection, aspect-oriented programming, and transaction management. However, certain versions of libspring-java are vulnerable to a Denial of Service (DoS) attack due to improper handling of ETags in HTTP request headers.
Vulnerability Detail
The vulnerability arises from the way applications parse ETags from the 'If-Match' and 'If-None-Match' request headers. Attackers can exploit this flaw by sending specially crafted headers that can lead to resource exhaustion, causing the application to become unresponsive. This issue affects multiple versions of libspring-java across various Debian releases, making it critical for users to address it promptly.
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 a size limit
@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)) {
throw new ServletException("Header size limit exceeded");
}
chain.doFilter(request, response);
}
}
Conclusion
In summary, the DoS vulnerability in libspring-java due to ETag header parsing poses a significant risk to applications using this library. Users are advised to upgrade to the patched version or implement a size limit on relevant headers as a workaround to mitigate potential attacks.
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FAQ
The vulnerability is a Denial of Service (DoS) issue caused by improper parsing of ETags in HTTP request headers.
All versions of libspring-java across Debian releases 11, 12, 13, and 14 are affected by this vulnerability.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If an immediate upgrade is not possible, implement a filter to limit the size of the 'If-Match' and 'If-None-Match' headers as a temporary workaround.
Failure to address this vulnerability could lead to service disruptions, making your application unresponsive to legitimate requests.
References
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