Heap Buffer Over-Read in libsoup HTTP Parser

Executive Summary

This vulnerability is a flaw in libsoup where an unsigned integer underflow in the soup_filter_input_stream_read_until() function causes a heap buffer over-read when parsing multipart HTTP responses. A malicious HTTP server could exploit this by sending a specially crafted multipart response to potentially crash the client application or expose sensitive heap memory.

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Impact Analysis

If you use an application that relies on libsoup, this vulnerability could allow an attacker to crash the application or leak sensitive memory contents. This might lead to denial of service or information disclosure, depending on the application's context and data handling.

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Compliance Impact

This vulnerability could potentially impact compliance with GDPR or HIPAA if it leads to unauthorized disclosure of sensitive data. A heap buffer over-read might expose memory containing personal or health information, violating confidentiality requirements under these regulations.

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Mitigation Strategies

Update libsoup to the latest patched version to address the heap buffer over-read issue in soup_filter_input_stream_read_until(). Monitor network traffic for suspicious multipart HTTP responses and apply network-level protections to filter malformed content.

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