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Bug 1336745 - (CVE-2016-4804) CVE-2016-4804 dosfstools: Heap-buffer-overflows in read_fat() and get_fat() functions
CVE-2016-4804 dosfstools: Heap-buffer-overflows in read_fat() and get_fat() f...
Status: CLOSED WONTFIX
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20160514,reported=2...
: Security
Depends On: 1337499
Blocks: 1336747
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Reported: 2016-05-17 07:43 EDT by Andrej Nemec
Modified: 2016-06-02 10:49 EDT (History)
1 user (show)

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Fixed In Version: dosfstools 4.0
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Last Closed: 2016-05-19 06:38:26 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Andrej Nemec 2016-05-17 07:43:44 EDT 
Multiple vulnerabilities were found in dosfstools. The variable used for storing the FAT size (in bytes) was an unsignedint. Since the size in sectors read from the BPB was not sufficiently checked, this could end up being zero after multiplying it with the sector size while some offsets still stayed excessive. Ultimately it would cause segfaults when accessing FAT entries for which no memory
was allocated.

External references:

https://github.com/dosfstools/dosfstools/issues/25
https://github.com/dosfstools/dosfstools/issues/26
https://blog.fuzzing-project.org/44-dosfstools-fsck.vfat-Several-invalid-memory-accesses.html


Upstream fix:

https://github.com/dosfstools/dosfstools/commit/e8eff147e9da1185f9afd5b25948153a3b97cf52
Comment 1 Huzaifa S. Sidhpurwala 2016-05-19 06:36:29 EDT 
Created dosfstools tracking bugs for this issue:

Affects: fedora-all [bug 1337499]
Comment 2 Fedora Update System 2016-05-20 13:36:04 EDT 
dosfstools-3.0.28-3.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
Comment 3 Fedora Update System 2016-05-20 19:50:02 EDT 
dosfstools-3.0.28-3.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 4 Fedora Update System 2016-06-02 10:49:33 EDT 
dosfstools-3.0.27-2.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
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