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Bug 278566 - dev-ruby/rubygems: gem install overwrites arbitrary files in /usr/bin
Summary: dev-ruby/rubygems: gem install overwrites arbitrary files in /usr/bin
Alias: None
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: High minor (vote)
Assignee: Gentoo Security
Whiteboard: B3 [noglsa]
Depends on:
Reported: 2009-07-21 11:18 UTC by Alex Legler (RETIRED)
Modified: 2013-09-03 02:01 UTC (History)
3 users (show)

See Also:
Package list:
Runtime testing required: ---

Reproducer, overwrites /usr/bin/less (testgem-0.0.1.gem,3.00 KB, application/octet-stream)
2009-07-21 11:20 UTC, Alex Legler (RETIRED)
no flags Details

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Description Alex Legler (RETIRED) archtester gentoo-dev Security 2009-07-21 11:18:51 UTC
If a gem includes an executable, gem install will merge them into /usr/bin/ without checking if the executable already exists, leading to arbitrary file overwriting.

I'll attach a reproducer.

Comment 1 Alex Legler (RETIRED) archtester gentoo-dev Security 2009-07-21 11:20:48 UTC
Created attachment 198688 [details]
Reproducer, overwrites /usr/bin/less

Reproduce with "sudo gem install testgem-0.0.1.gem"
Comment 2 Gordon Malm (RETIRED) gentoo-dev 2009-07-21 21:24:33 UTC
gem will also install executables and libraries world-writeable if they are distributed that way in the prepared gem. :p
Comment 4 Diego Elio Pettenò (RETIRED) gentoo-dev 2009-07-30 11:27:58 UTC
This is a references loop since my post was actually inspired once Alex told me of the issue ^^
Comment 5 Alex Legler (RETIRED) archtester gentoo-dev Security 2010-05-23 09:26:58 UTC
Still not fixed. We'll likely do this in Gentoo by not installing gem binaries to /usr/bin
Comment 6 Diego Elio Pettenò (RETIRED) gentoo-dev 2010-08-03 16:14:02 UTC
1.3.7-r2 no longer installs in /usr/bin, feel free to consider closing this or releasing a GLSA.
Comment 7 Chris Reffett (RETIRED) gentoo-dev Security 2013-09-03 02:01:58 UTC
Fixed for several years. Closing noglsa.