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Mgetty: Insecure temporary file usage


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200812-08 / mgetty
Release Date December 06, 2008
Latest Revision December 23, 2008: 02
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
net-dialup/mgetty < 1.1.36-r3 >= 1.1.36-r3 All supported architectures

Related bugreports: #235806


Mgetty uses temporary files in an insecure manner, allowing for symlink attacks.

2.  Impact Information


Mgetty is a set of fax and voice modem programs.


Dmitry E. Oboukhov reported that the "spooldir" directory in fax/ is created in an insecure manner.


A local attacker could exploit this vulnerability to overwrite arbitrary files with the privileges of the user running the application.

3.  Resolution Information


There is no known workaround at this time.


All Mgetty users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dialup/mgetty-1.1.36-r3"

4.  References


Page updated December 06, 2008

Summary: This is a Gentoo Linux Security Advisory

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