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Gitorious Remote Command Execution

Gitorious Remote Command Execution
Posted Jan 28, 2012
Authored by joernchen | Site phenoelit.de

Gitorious versions prior to 2.1.1 suffer from a remote command execution vulnerability.

tags | exploit, remote
MD5 | 29144dc4f809ee2b0f9f56dd45971982

Gitorious Remote Command Execution

Change Mirror Download
Phenoelit Advisory <wir-haben-auch-mal-was-gefunden #0815 +--+->

[ Authors ]
joernchen <joernchen () phenoelit de>

Phenoelit Group (http://www.phenoelit.de)

[ Affected Products ]
Gitorious < 2.1.1 (http://gitorious.org)

[ Vendor communication ]
2012-01-16 Asking vendor for PGP key
2012-01-17 Getting PGP key from vendor
2012-01-17 Sending vulnerability details to vendor
2012-01-19 Vendor replies and sends link to patch [0]
2012-01-19 Asking if users will be informed
2012-01-20 Vendor states that they will create a patch and let the
users know
2012-01-25 Asking for a timeline for the notification
2012-01-26 Vendor replies that patched branch is pushed and users
are informed via a mailinglist.
2012-01-27 Release of this advisory

[ Overview ]
Gitorious is a Git repository management software written in Ruby
on Rails.

[ Description ]
Gitorious has been found vulnerable to unauthenticated remote
command execution.

Root cause is in gitorious-mainline/lib/gitorious/git_shell.rb:

def execute(command)
Timeout.timeout(20) do
`#{command}`
end
rescue Timeout::Error

called by app/controllers/api/graphs_controller.rb:

def graph_log(repo, type, branch = nil)
args = [repo.full_repository_path, "--decorate=full", "-100",
type]
args << desplat_path(branch) if branch
git_shell.send(:graph_log, *args)
end

where branch is user controlled via route:

api.connect ':project_id/:repository_id/log/graph/*branch',
:controller => 'graphs', :action => 'show'

[ Example ]
http://gitorious.site/project/repo/log/graph/`id>/tmp/command_exec`

For convenient use of this feature have a look at [1]

[ Solution ]
Update to version 2.1.1

[ References ]
[0] https://gitorious.org/gitorious/mainline/commit/
647aed91a4dc72e88a27476948dfbacd5d0bf7ce
[1] http://metasploit.com/modules/exploit/multi/http/gitorious_graph

[ end of file ]

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