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Encoding validation missing in xmltok_impl.c #290

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opened 2025-12-15 05:27:06 +00:00 by Mrcopytuo · 0 comments
Mrcopytuo commented 2025-12-15 05:27:06 +00:00
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In the file contrib/sdk/sources/expat/lib/xmltok_impl.c of the KolibriOS SDK copy of libexpat, I observed that certain UTF-8 encoding sequences are not sufficiently validated before processing.
This corresponds to the security vulnerability CVE-2022-25235, which describes that in Expat(before version 2.4.5) xmltok_impl.c “lacks certain validation of encoding. Because KolibriOS includes its own copy of libexpat in the SDK, this missing validation could allow maliciously crafted XML input to be parsed incorrectly, potentially leading to memory corruption or code execution.

In the file contrib/sdk/sources/expat/lib/xmltok_impl.c of the KolibriOS SDK copy of libexpat, I observed that certain UTF-8 encoding sequences are not sufficiently validated before processing. This corresponds to the security vulnerability [CVE-2022-25235](https://nvd.nist.gov/vuln/detail/cve-2022-25235), which describes that in Expat(before version 2.4.5) xmltok_impl.c “lacks certain validation of encoding. Because KolibriOS includes its own copy of libexpat in the SDK, this missing validation could allow maliciously crafted XML input to be parsed incorrectly, potentially leading to memory corruption or code execution.
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Reference: KolibriOS/kolibrios#290
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