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Rootkit Hunter: Insecure temporary file creation


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200504-25 / rkhunter
Release Date April 26, 2005
Latest Revision April 26, 2005: 01
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
app-forensics/rkhunter < 1.2.3-r1 >= 1.2.3-r1 All supported architectures

Related bugreports: #90007


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

2.  Impact Information


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 script.


Sune Kloppenborg Jeppesen and Tavis Ormandy of the Gentoo Linux Security Team have reported that the script and the main rkhunter script insecurely creates several temporary files with predictable filenames.


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 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.

3.  Resolution Information


There is no known workaround at this time.


All Rootkit Hunter users should upgrade to the latest version:

Code Listing 3.1: Resolution

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

4.  References


Page updated April 26, 2005

Summary: This is a Gentoo Linux Security Advisory

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