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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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