fbida: Insecure temporary file creation

1.  Gentoo Linux Security Advisory

Version Information

Related bugreports: #129470

Synopsis

fbida is vulnerable to linking attacks, potentially allowing a local user to overwrite arbitrary files.

2.  Impact Information

Background

fbida is a collection of image viewers and editors for the framebuffer console and X11.

Description

Jan Braun has discovered that the "fbgs" script provided by fbida insecurely creates temporary files in the "/var/tmp" directory.

Impact

A local attacker could create links in the temporary file directory, pointing to a valid file somewhere on the filesystem. When an affected script is called, this could result in the file being overwritten with the rights of the user running the script.

3.  Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All fbida users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=media-gfx/fbida-2.03-r3"

4.  References

• CVE-2006-1695