Perl: Insecure temporary file creation — GLSA 200412-04

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

Affected Packages

dev-lang/perl on all architectures
Affected versions < 5.8.5-r2, = 5.8.6
Unaffected versions revision >= 5.8.5-r2, >= 5.8.6-r1

Background

Perl is a stable, cross-platform programming language created by Larry Wall.

Description

Some Perl modules create temporary files in world-writable directories with predictable names.

Impact

A local attacker could create symbolic links in the temporary files directory, pointing to a valid file somewhere on the filesystem. When a Perl script 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.

Workaround

There is no known workaround at this time.

Resolution

All Perl users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=perl-5.8.5-r2"

References

Release Date
December 07, 2004

Latest Revision
December 07, 2004: 01

Severity
normal

Exploitable
local

Bugzilla entries