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Ruby Gem ldoce 0.0.2 Command Execution

Ruby Gem ldoce 0.0.2 Command Execution
Posted Apr 1, 2013
Authored by Larry W. Cashdollar

Ruby Gem ldoce version 0.0.2 suffers from a command execution vulnerability.

tags | exploit, ruby
MD5 | 8264825989f83492a2689166827d3b1e

Ruby Gem ldoce 0.0.2 Command Execution

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Remote command execution in Ruby Gem ldoce 0.0.2
Larry W. Cashdollar
@_larry0
3/25/2013

Ldoce Ruby Gem:

Easily interface with the Longman Dictionary of Contemporary English API from Ruby:

NB currently mac only as it depends on the afplay command.

https://github.com/markburns/ldoce

Ldoce passes an mp3 url to commandline for audio output of the pronunciation of a dictonary word:

If the URL or filename for the mp3 files contain shell metacharacters code can be executed remotely as the client:

[./ldoce-0.0.2/lib/ldoce/word.rb]

if mp3?
unless File.exists? filename
command = "curl #{mp3_url} -silent > {filename}"
`{command}`
end
`afplay #{filename}`
end

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