ESB-2018.2718 - [Ubuntu] zsh: Execute arbitrary code/commands - Existing account 2018-09-12

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.2718
                            Zsh vulnerabilities
                             12 September 2018

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

Product:           zsh
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-13259 CVE-2018-1100 CVE-2018-0502

Reference:         ESB-2018.2714
                   ESB-2018.1803

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3764-1

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USN-3764-1: Zsh vulnerabilities

11 September 2018

zsh vulnerabilities

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

  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS
  o Ubuntu 14.04 LTS

Summary

Zsh could be made to execute arbitrary code if it received a specially crafted
script.

Software Description

  o zsh - shell with lots of features

Details

It was discovered that Zsh incorrectly handled certain scripts. An attacker
could possibly use this issue to execute arbitrary code. (CVE-2018-0502,
CVE-2018-13259)

Richard Maciel Costa discovered that Zsh incorrectly handled certain scripts.
An attacker could possibly use this issue to execute arbitrary code.
(CVE-2018-1100)

Update instructions

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

Ubuntu 18.04 LTS
    zsh - 5.4.2-3ubuntu3.1
Ubuntu 16.04 LTS
    zsh - 5.1.1-1ubuntu2.3
Ubuntu 14.04 LTS
    zsh - 5.0.2-3ubuntu6.3

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to restart Zsh to make all the
necessary changes.

References

  o CVE-2018-0502
  o CVE-2018-1100
  o CVE-2018-13259

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