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AUSCERT External Security Bulletin Redistribution
ESB-2018.0506
RubyGems security updates
20 February 2018
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AusCERT Security Bulletin Summary
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Product: RubyGems
Publisher: ruby-lang.org
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Cross-site Scripting -- Existing Account
Access Confidential Data -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
Original Bulletin:
https://www.ruby-lang.org/en/news/2018/02/17/multiple-vulnerabilities-in-rubygems/
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Multiple vulnerabilities in RubyGems
Posted by usa on 17 Feb 2018
There are multiple vulnerabilities in RubyGems bundled by Ruby. It is reported
at the official blog of RubyGems.
Details
The following vulnerabilities have been reported.
Prevent path traversal when writing to a symlinked basedir outside of the root.
Fix possible Unsafe Object Deserialization Vulnerability in gem owner.
Strictly interpret octal fields in tar headers.
Raise a security error when there are duplicate files in a package.
Enforce URL validation on spec homepage attribute.
Mitigate XSS vulnerability in homepage attribute when displayed via gem server.
Prevent Path Traversal issue during gem installation.
It is strongly recommended for Ruby users to take one of the following workarounds
as soon as possible.
Affected Versions
Ruby 2.2 series: 2.2.9 and earlier
Ruby 2.3 series: 2.3.6 and earlier
Ruby 2.4 series: 2.4.3 and earlier
Ruby 2.5 series: 2.5.0 and earlier
prior to trunk revision 62422
Workarounds
RubyGems 2.7.6 or later includes the fix for the vulnerabilities, so upgrade
RubyGems to the latest version.
gem update --system
If you can’t upgrade RubyGems, you can apply the following patches as a workaround.
for Ruby 2.2.9
for Ruby 2.3.6
for Ruby 2.4.3
for Ruby 2.5.0
About the trunk, update to the latest revision.
Credits
This report is based on the official blog of RubyGems.
History
Originally published at 2018-02-17 03:00:00 UTC
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