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Message-ID: <8734epfa6u.fsf@gentoo.org>
Date: Thu, 03 Apr 2025 18:04:41 +0100
From: Sam James <sam@...too.org>
To: oss-security@...ts.openwall.com
Cc: Lasse Collin <lasse.collin@...aani.org>, Sebastian Andrzej Siewior
<sebastian@...akpoint.cc>
Subject: Re: XZ Utils: Threaded decoder frees memory too
early (CVE-2025-31115)
Sam James <sam@...too.org> writes:
> Sam James <sam@...too.org> writes:
>
>> # Impact
>>
>> The threaded .xz decoder in liblzma has a bug that can at least result
>> in a crash (denial of service). The effects include heap use after free
>> and writing to an address based on the null pointer plus an offset.
>>
>> This affects XZ Utils versions from 5.3.3alpha to 5.8.0. Applications
>> and libraries that use the lzma_stream_decoder_mt function are affected.
>
> Our belief is that it's highly impractical to exploit on 64-bit systems
> where xz was built with PIE (=> ASLR), but that on 32-bit systems,
> especially without PIE, it may be doable.
I should correct myself here: it's easy to exploit the *crash* (though
for liblzma users, it depends on how they ingest files), but not easy to
take over the process.
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