ESB-2018.0691 - [UNIX/Linux][Ubuntu] Zsh: Multiple vulnerabilities 2018-03-09

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0691
                            Zsh vulnerabilities
                               9 March 2018

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

Product:           Zsh
Publisher:         Ubuntu
Operating System:  Ubuntu
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Increased Privileges            -- Existing Account            
                   Denial of Service               -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-7549 CVE-2018-7548 CVE-2017-18206
                   CVE-2017-18205 CVE-2016-10714 CVE-2014-10072
                   CVE-2014-10071 CVE-2014-10070 

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3593-1

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

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USN-3593-1: Zsh vulnerabilities

8 March 2018

zsh vulnerabilities

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

    Ubuntu 17.10

    Ubuntu 16.04 LTS

    Ubuntu 14.04 LTS

Summary

Several security issues were fixed in Zsh.

Software Description

    zsh - shell with lots of features

Details

It was discovered that Zsh incorrectly handled certain enviroment variables. 
An attacker could possibly use this issue to gain privileged access to the 
system. This issue only affected Ubuntu 14.04 LTS. (CVE-2014-10070)

It was discovered that Zsh incorrectly handled certain inputs. An attacker 
could possibly use this to execute arbitrary code. This issue only affected 
Ubuntu 14.04 LTS. (CVE-2014-10071)

It was discovered that Zsh incorrectly handled some symbolic links. An 
attacker could possibly use this to execute arbitrary code. This issue only 
affected Ubuntu 14.04 LTS. (CVE-2014-10072)

It was discovered that Zsh incorrectly handled certain errors. An attacker 
could possibly use this issue to cause a denial of service. (CVE-2016-10714)

It was discovered that Zsh incorrectly handled certain commands. An attacker 
could possibly use this to execute arbitrary code. (CVE-2017-18205)

It was discovered that Zsh incorrectly handled certain symlinks. An attacker 
could possibly use this to execute arbitrary code. This issue only affected 
Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2017-18206)

It was discovered that Zsh incorrectly handled certain inputs. An attacker 
could possible use to execute arbitrary code. This issue only affected Ubuntu
17.10. (CVE-2018-7548)

It was discovered that Zsh incorrectly handled certain inputs. An attacker 
could possibly use this to cause a denial of service. (CVE-2018-7549)

Update instructions

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

Ubuntu 17.10

    zsh - 5.2-5ubuntu1.1

Ubuntu 16.04 LTS

    zsh - 5.1.1-1ubuntu2.1

Ubuntu 14.04 LTS

    zsh - 5.0.2-3ubuntu6.1

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

    CVE-2014-10070

    CVE-2014-10071

    CVE-2014-10072

    CVE-2016-10714

    CVE-2017-18205

    CVE-2017-18206

    CVE-2018-7548

    CVE-2018-7549

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