Linux Mint 8 mintUpdate Insecure Temporary File Creation

2010-05-21T00:00:00
ID SECURITYVULNS:DOC:23897
Type securityvulns
Reporter Securityvulns
Modified 2010-05-21T00:00:00

Description

====================================================================== 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