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Linux Mint 8 mintUpdate Insecure Temporary File Creation

Linux Mint 8 mintUpdate Insecure Temporary File Creation
Posted May 21, 2010
Authored by L4teral

Linux Mint 8 mintUpdate suffers from an insecure temporary file creation vulnerability.

tags | advisory
systems | linux
SHA-256 | 35b1d7d42f1f78667bd097954ea4a8843de4e2fd5a8e6f5dcb9d5d0f7e05b58a

Linux Mint 8 mintUpdate Insecure Temporary File Creation

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======================================================================
Linux Mint 8 mintUpdate Insecure Temporary File Creation
======================================================================

Author: L4teral <l4teral [at] gmail com>
Impact: Privilege Escalation
Status: Update available


------------------------------
Affected software description:
------------------------------

Application: mintUpdate (Linux Mint)
Version: Linux Mint 8
Vendor: http://linuxmint.com

Description:
Linux Mint's purpose is to produce an elegant, up to date and
comfortable GNU/Linux desktop distribution.


--------------
Vulnerability:
--------------

The Linux Mint update tool mintUpdate creates temporary files in the
/tmp/mintUpdate/ directory in an insecure way. This can be exploited
to overwrite restricted files via symlink attacks.


------------
PoC/Exploit:
------------

The symlinks must exist when the user clicks on the mintUpdate Icon.
After requesting root privileges via sudo, the update tool overwrites
the target file with log data. This could be exploited to destroy
crucial system files.


---------
Solution:
---------

Update to Linux Mint 9
or apply the following patch:
http://github.com/linuxmint/mintupdate/commit/301993906c694eb119cd9614817de57e7b0c874c


---------
Timeline:
---------

2010-03-08 - vendor informed
2010-03-17 - vendor response, patched in source repository
2010-05-18 - Linux Mint 9 released, public disclosure
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