ESB-2019.1253 - [Ubuntu] rssh: Execute arbitrary code/commands - Existing account 2019-04-12

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.1253
                           rssh vulnerabilities
                               12 April 2019

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           rssh
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-1000018 CVE-2019-3464 CVE-2019-3463

Reference:         ESB-2019.0360.2
                   ESB-2019.0306

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3946-1

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==========================================================================
Ubuntu Security Notice USN-3946-1
April 11, 2019

rssh vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- - Ubuntu 18.10
- - Ubuntu 18.04 LTS
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS

Summary:

rssh could be made to run arbitrary commands if it received specially crafted
input.

Software Description:
- - 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 LTS:
  rssh                            2.3.4-7ubuntu0.1

Ubuntu 16.04 LTS:
  rssh                            2.3.4-4+deb8u2ubuntu0.16.04.2

Ubuntu 14.04 LTS:
  rssh                            2.3.4-4+deb8u2ubuntu0.14.04.2

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

References:
  https://usn.ubuntu.com/usn/usn-3946-1
  CVE-2019-1000018, CVE-2019-3463, CVE-2019-3464

Package Information:
  https://launchpad.net/ubuntu/+source/rssh/2.3.4-8ubuntu0.2
  https://launchpad.net/ubuntu/+source/rssh/2.3.4-7ubuntu0.1
  https://launchpad.net/ubuntu/+source/rssh/2.3.4-4+deb8u2ubuntu0.16.04.2
  https://launchpad.net/ubuntu/+source/rssh/2.3.4-4+deb8u2ubuntu0.14.04.2

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===========================================================================
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