Texinfo: Insecure temporary file creation — GLSA 200510-04

Texinfo is vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files.

Affected Packages

sys-apps/texinfo on all architectures
Affected versions < 4.8-r1
Unaffected versions >= 4.8-r1

Background

Texinfo is the official documentation system created by the GNU project.

Description

Frank Lichtenheld has discovered that the "sort_offline()" function in texindex insecurely creates temporary files with predictable filenames.

Impact

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

Workaround

There is no known workaround at this time.

Resolution

All Texinfo users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=sys-apps/texinfo-4.8-r1"

References

Release Date
October 05, 2005

Latest Revision
October 05, 2005: 01

Severity
normal

Exploitable
local

Bugzilla entries