ESB-2019.0270 - [Linux][Debian] rssh: Execute arbitrary code/commands - Existing account 2019-01-31

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0270
                     [DLA 1650-1] rssh security update
                              31 January 2019

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

Product:           rssh
Publisher:         Debian
Operating System:  Debian GNU/Linux 8
                   Linux variants
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-1000018  

Original Bulletin: 
   https://lists.debian.org/debian-lts-announce/2019/01/msg00027.html

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Debian. It is recommended that administrators 
         running rssh check for an updated version of the software for their
         operating system.

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Package        : rssh
Version        : 2.3.4-4+deb8u1
CVE ID         : CVE-2019-1000018
Debian Bug     : 919623

The ESnet security team discovered a vulnerability in rssh, a restricted
shell that allows users to perform only scp, sftp, cvs, svnserve
(Subversion), rdist and/or rsync operations. Missing validation in the
scp support could result in the bypass of this restriction, allowing the
execution of arbitrary shell commands.

Please note that with the update applied, the "-3" option of scp can no
longer be used.

For Debian 8 "Jessie", this problem has been fixed in version
2.3.4-4+deb8u1.

We recommend that you upgrade your rssh packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

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