Bug 1336745 (CVE-2016-4804) - CVE-2016-4804 dosfstools: Heap-buffer-overflows in read_fat() and get_fat() functions
Summary: CVE-2016-4804 dosfstools: Heap-buffer-overflows in read_fat() and get_fat() f...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2016-4804
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1337499
Blocks: 1336747
TreeView+ depends on / blocked
 
Reported: 2016-05-17 11:43 UTC by Andrej Nemec
Modified: 2021-02-17 03:52 UTC (History)
1 user (show)

Fixed In Version: dosfstools 4.0
Clone Of:
Environment:
Last Closed: 2016-05-19 10:38:26 UTC
Embargoed:

Attachments (Terms of Use)

Description Andrej Nemec 2016-05-17 11:43:44 UTC 
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 10:36:29 UTC 
Created dosfstools tracking bugs for this issue:

Affects: fedora-all [bug 1337499]
Comment 2 Fedora Update System 2016-05-20 17:36:04 UTC 
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 23:50:02 UTC 
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 14:49:33 UTC 
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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