CVE-2016-10722: FAT Bitmap Heap Overflow

[lxp]

=======================================================================
 title    : Partclone FAT Bitmap Heap Overflow
 product  : Partclone
 version  : 0.2.87
 homepage : http://partclone.org/
 found    : 2016-01-03
 by       : David Gnedt
=======================================================================

Vendor description:
-------------------

Partclone is a parition imaging tool supporting the FAT filesystem.
Partclone is shipped by various Linux distributions and used by
specialized disk cloning systems like DRBL (http://drbl.org/),
Clonezilla (http://clonezilla.org/), Redo Backup
(http://redobackup.org/), ...

Vulnerability overview/description:
-----------------------------------

partclone.fat is prone to a heap-based buffer overflow vulnerability
due to insufficient validation of the FAT superblock. An attacker may
be able to execute arbitrary code in the context of the user running
the affected application.

<details stripped until public fix is available>

Proof of concept:
-----------------

<details stripped until public fix is available>

Vulnerable/tested versions:
---------------------------

The vulnerability is verified to exist in 0.2.87 of Partclone, which is
the most recent version at the time of discovery.
Older versions are probably affected as well.

[lxp]

The issue is fixed since 0.2.88. I have tested 0.2.88 and 0.2.89. You can find the full version of the advisory on my blog: https://david.gnedt.at/blog/2016/11/14/advisory-partclone-fat-bitmap-heap-overflow/

[lxp]

CVE-2016-10722 was assigned to this issue.