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Date: Sun, 8 May 2016 22:19:02 +0200
From: Hanno Böck <hanno@...eck.de>
To: oss-security@...ts.openwall.com, cve-assign@...re.org
Subject: dosfstools / fsck.vfat: Several invalid memory accesses

https://blog.fuzzing-project.org/44-dosfstools-fsck.vfat-Several-invalid-memory-accesses.html

I lately fuzzed various filesystem check tools. This uncovered a number
of issues in dosfstools / fsck.fat that have now been fixed in the new
version 4.0. All issues were found with american fuzzy lop and address
sanitizer.

https://github.com/dosfstools/dosfstools/issues/11
Global out of bounds read file_stat() / check_dir()
https://github.com/dosfstools/dosfstools/commit/2aad1c83c7d010de36afbe79c9fde22c50aa2f74
Git commit / fix

https://github.com/dosfstools/dosfstools/issues/12
Unclear invalid memory access in get_fat()
https://github.com/dosfstools/dosfstools/commit/07908124838afcc99c577d1d3e84cef2dbd39cb7
Git commit / fix

https://github.com/dosfstools/dosfstools/issues/25
Heap overflow in read_fat()
https://github.com/dosfstools/dosfstools/issues/26
Heap out of bounds read in get_fat()
https://github.com/dosfstools/dosfstools/commit/e8eff147e9da1185f9afd5b25948153a3b97cf52
Git commit / fix for both issues

These bugs can pose a security risk if a system automatically checks
attached storage media with fsck or in situations where filesystems on
untrusted devices get checked. The new version dosfstools 4.0 fixes all
four bugs.


-- 
Hanno Böck
https://hboeck.de/

mail/jabber: hanno@...eck.de
GPG: BBB51E42

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