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AUSCERT External Security Bulletin Redistribution
[DLA 1480-1] ruby2.1 security update
28 August 2018
AusCERT Security Bulletin Summary
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
CVE Names: CVE-2018-1000074 CVE-2018-1000073 CVE-2016-2337
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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.
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.
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.
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
For Debian 8 "Jessie", these problems have been fixed in version
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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