Headline

CVE-2018-25032: security - zlib memory corruption on deflate (i.e. compress)

zlib 1.2.11 allows memory corruption when deflating (i.e., when compressing) if the input has many distant matches.

2 years ago

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Date: Wed, 23 Mar 2022 20:49:49 -0700 From: Tavis Ormandy <taviso@…il.com> To: oss-security@…ts.openwall.com Subject: zlib memory corruption on deflate (i.e. compress)

Greetings list, I was recently trying to track down a reproducible crash in a compressor. Believe it or not, it really was a bug in zlib-1.2.11 when compressing (not decompressing!) certain inputs.

I reported it upstream, but it turns out the issue has been public since 2018, but the patch never made it into a release. As far as I know, nobody ever assigned it a CVE.

https://github.com/madler/zlib/commit/5c44459c3b28a9bd3283aaceab7c615f8020c531

As far as I can tell, no distros have picked this up.

Tavis.

– _o) $ lynx lock.cmpxchg8b.com /\\ _o) _o) $ finger taviso@…org _\_V _( ) _( ) @taviso

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