USN-3946-1: rssh vulnerabilities

Releases

• Ubuntu 18.10
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• rssh - Restricted shell allowing scp, sftp, cvs, svn, rsync or rdist

Details

It was discovered that rssh incorrectly handled certain command-line arguments
and environment variables. An authenticated user could bypass rssh's command
restrictions, allowing an attacker to run arbitrary commands.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.10

• rssh - 2.3.4-8ubuntu0.2

Ubuntu 18.04

• rssh - 2.3.4-7ubuntu0.1

Ubuntu 16.04

• rssh - 2.3.4-4+deb8u2ubuntu0.16.04.2

Ubuntu 14.04

• rssh - 2.3.4-4+deb8u2ubuntu0.14.04.2

In general, a standard system update will make all the necessary changes.

References

• CVE-2019-1000018
• CVE-2019-3463
• CVE-2019-3464