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mtink: Insecure tempfile handling


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200411-17 / mtink
Release Date November 09, 2004
Latest Revision May 22, 2006: 02
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
net-print/mtink < 1.0.5 >= 1.0.5 All supported architectures

Related bugreports: #70310


mtink is vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files with the rights of the user running the utility.

2.  Impact Information


mtink is a status monitor and inkjet cartridge changer for some Epson printers.


Tavis Ormandy from Gentoo Linux discovered that mtink uses insecure permissions on temporary files.


A local attacker could create symbolic links in the temporary files directory, pointing to a valid file somewhere on the filesystem. When mtink is executed, this would result in the file being overwritten with the rights of the user running the utility, which could be the root user.

3.  Resolution Information


There is no known workaround at this time.


All mtink users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-print/mtink-1.0.5"

4.  References


Page updated November 09, 2004

Summary: This is a Gentoo Linux Security Advisory

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