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Date: Thu, 29 Oct 2015 14:56:45 -0400 (EDT)
From: cve-assign@...re.org
To: hanno@...eck.de
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com
Subject: Re: Heap overflow and endless loop in exfatfsck / exfat-utils

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> https://blog.fuzzing-project.org/25-Heap-overflow-and-endless-loop-in-exfatfsck-exfat-utils.html
> https://github.com/relan/exfat/issues/5
> https://github.com/relan/exfat/commit/2e86ae5f81da11f11673d0546efb525af02b7786

Use CVE-2015-8026 for the "AddressSanitizer: heap-buffer-overflow ...
WRITE of size 110" report for the
exfatfsck-heap-overflow-write-verify_vbr_checksum file. If anyone
wants to show that another part of the
2e86ae5f81da11f11673d0546efb525af02b7786 commit fixed a different
vulnerability that wasn't reported in the
25-Heap-overflow-and-endless-loop-in-exfatfsck-exfat-utils.html post,
then a second CVE ID may be available.


> Another malformed input can cause an endless loop, leading to a
> possible denial of service.

> Especially at risk are systems that are configured to run filesystem
> checks automatically on external devices like USB flash drives.

>> Detect infinite loop in rootdir_size().
>> 
>> Otherwise malformed FS can cause hang on mount.

We don't feel that this endless-loop issue should necessarily have a
CVE ID. There may be some environments in which the attacker can cross
a privilege boundary by inserting a flash drive to trigger CPU
consumption and/or inability to complete the boot process. Often,
shutting off the computer would be an equally effective DoS.

- -- 
CVE assignment team, MITRE CVE Numbering Authority
M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]
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