Rootkit Hunter: Insecure temporary file creation — GLSA 200504-25

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

Affected Packages

app-forensics/rkhunter on all architectures
Affected versions < 1.2.3-r1
Unaffected versions >= 1.2.3-r1

Background

Rootkit Hunter is a scanning tool to detect rootkits, backdoors and local exploits on a local machine. Rootkit Hunter uses downloaded data files to check file integrity. These files are updated via the check_update.sh script.

Description

Sune Kloppenborg Jeppesen and Tavis Ormandy of the Gentoo Linux Security Team have reported that the check_update.sh script and the main rkhunter script insecurely creates several 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 rkhunter or the check_update.sh script runs, 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 Rootkit Hunter users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=app-forensics/rkhunter-1.2.3-r1"

References

Release Date
April 26, 2005

Latest Revision
April 26, 2005: 01

Severity
normal

Exploitable
local

Bugzilla entries