scponly: Multiple vulnerabilities

Background

scponly is a shell for restricting user access to file transfer only using sftp and scp.

Description

Joachim Breitner reported that Subversion and rsync support invokes subcommands in an insecure manner (CVE-2007-6350). It has also been discovered that scponly does not filter the -o and -F options to the scp executable (CVE-2007-6415).

Impact

A local attacker could exploit these vulnerabilities to elevate privileges and execute arbitrary commands on the vulnerable host.

Workaround

There is no known workaround at this time.

Resolution

All scponly users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=net-misc/scponly-4.8"

Due to the design of scponly’s Subversion support, security restrictions can still be circumvented. Please read carefully the SECURITY file included in the package.