Executive Summary

This vulnerability is a heap-buffer-overflow in GPAC's SVG parser, specifically in the function svg_parse_strings() located in src/scenegraph/svg_attributes.c. It occurs when parsing a maliciously crafted SVG file, causing an out-of-bounds heap read of 1 byte past the allocated memory region. This leads to a crash and can be triggered through the standard SVG file loading process.

The issue involves improper boundary checks when handling string parsing, which allows reading beyond the allocated buffer. The vulnerability affects multiple functions in the SVG parsing path, including gf_svg_parse_attribute(), svg_node_start(), gf_xml_sax_parse_file(), and load_svg_run().

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Impact Analysis

This vulnerability can cause a denial-of-service (DoS) condition by crashing the GPAC application when it processes a specially crafted SVG file. An attacker can exploit this by providing malicious SVG input that triggers the heap-buffer-overflow, leading to application instability or termination.

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Detection Guidance

This vulnerability can be detected by monitoring for crashes or denial-of-service conditions when processing SVG files with GPAC, specifically in the SVG parser component.

Using AddressSanitizer or similar memory error detection tools on a sanitizer-enabled build of GPAC can help identify the heap-buffer-overflow during parsing.

A practical approach is to test GPAC with known maliciously crafted SVG files that trigger the vulnerability, such as the proof-of-concept samples provided by the reporter.

Suggested commands include running GPAC with AddressSanitizer enabled and parsing suspicious SVG files to observe crashes or sanitizer reports.

• Compile GPAC with AddressSanitizer: `CC=clang CFLAGS='-fsanitize=address' cmake . && make`
• Run GPAC on a suspicious SVG file: `./gpac input.svg` and monitor for crashes or sanitizer output.

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Mitigation Strategies

The immediate mitigation step is to update GPAC to a version that includes the fix from commit v391dc7f4d234988ea0bc3cc294eb725eddf8f702.

This fix adds proper boundary checks in the `svg_parse_strings()` function to prevent out-of-bounds access.

Until the update can be applied, avoid processing untrusted or malicious SVG files with GPAC to reduce the risk of denial-of-service.

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Compliance Impact

The provided information does not include any details about the impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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