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AUSCERT External Security Bulletin Redistribution
ESB-2018.2538
[DLA 1480-1] ruby2.1 security update
28 August 2018
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AusCERT Security Bulletin Summary
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Product: ruby2.1
Publisher: Debian
Operating System: Debian GNU/Linux 8
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Modify Arbitrary Files -- Remote with User Interaction
Create Arbitrary Files -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2018-1000074 CVE-2018-1000073 CVE-2016-2337
Reference: ESB-2018.2220
ESB-2017.1828
Original Bulletin:
https://lists.debian.org/debian-lts-announce/2018/08/msg00028.html
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Package : ruby2.1
Version : 2.1.5-2+deb8u5
CVE ID : CVE-2016-2337 CVE-2018-1000073 CVE-2018-1000074
Debian Bug : 895778 851161
Several vulnerabilities were discovered in Ruby 2.1.
CVE-2016-2337
Type confusion exists in _cancel_eval Ruby's TclTkIp class
method. Attacker passing different type of object than String as
"retval" argument can cause arbitrary code execution.
CVE-2018-1000073
RubyGems contains a Directory Traversal vulnerability in
install_location function of package.rb that can result in path
traversal when writing to a symlinked basedir outside of the root.
CVE-2018-1000074
RubyGems contains a Deserialization of Untrusted Data
vulnerability in owner command that can result in code
execution. This attack appear to be exploitable via victim must
run the `gem owner` command on a gem with a specially crafted YAML
file.
For Debian 8 "Jessie", these problems have been fixed in version
2.1.5-2+deb8u5.
We recommend that you upgrade your ruby2.1 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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