Buffer Overflow in libconfini v1.16.4

Executive Summary

This is a Buffer Overflow vulnerability in libconfini version 1.16.4. It occurs due to an allocation-size mismatch between the load_ini_buffer utility and strip_ini_cache function. This allows a remote attacker to cause a denial of service by exploiting the size discrepancy.

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Detection Guidance

To detect this vulnerability, compile libconfini with AddressSanitizer (ASan) and run the bundled load_ini_buffer utility with non-empty input. If a heap-buffer-overflow error is triggered, the vulnerability is present. Example command: gcc -fsanitize=address -o test test.c && ./test <input_file>.

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Impact Analysis

A remote attacker could exploit this flaw to crash the affected system or service, leading to a denial of service. This could disrupt operations if the library is used in a critical application or infrastructure.

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Compliance Impact

This vulnerability does not directly affect compliance with GDPR or HIPAA as it is a technical implementation issue in a software library. However, if exploited, it could lead to denial of service or heap corruption, potentially causing system instability or crashes. Such disruptions might indirectly impact systems handling sensitive data, potentially violating availability requirements under GDPR or HIPAA.

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Mitigation Strategies

Update libconfini to the patched version where the buffer allocation matches the documented requirement of ini_length + 1 bytes. Alternatively, modify the bundled load_ini_buffer utility to allocate ini_length + 1 bytes to prevent the out-of-bounds write.

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