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Date: Sat, 3 Jan 2015 18:54:05 -0500 (EST)
From: cve-assign@...re.org
To: Dawa Ometto <d.l.a.ometto@...nl>
cc: oss-security@...ts.openwall.com, cve-assign@...re.org
Subject: Re: Re: CVE request: remote code execution vulnerability
 in gollum < 3.1.1


On Thu, 18 Dec 2014, Dawa Ometto wrote:

> Resubmitting this (while fixing version number typo in the subject-line)
> since it never did receive a CVE.
>
> On 04/12/14 22:08, Dawa Ometto wrote:
>> Hi,
>>
>> I just released a fix for a remote code execution vulnerability in
>> gollum [1]. The vulnerable code was in the gollum-grit_adapter [2] ruby
>> gem dependency as of gollum v3.1.0, but the exploitable code was also
>> present before that version, in the gollum-lib [3] gem dependency (code
>> was abstracted from gollum-lib to the new dependency).
>>
>> Type of vulnerability: remote code execution
>> Attack outcome: run arbitrary commands, shell access
>> Vulnerable versions: gollum < 3.1.1, gollum-lib < 4.0.1,
>> gollum-grit_adapter < 0.1.1
>> Fix: `gem update gollum` will update the dependencies.
>> Link to vulnerability/fix diff:
>> https://github.com/gollum/grit_adapter/commit/4520d973c81fecfebbeacd2ef2f1849d763951c7
>> Link to project issue: https://github.com/gollum/gollum/issues/913
>>
>> Description: The bug exploits the fact that gollum uses the grit gem for
>> git repository access, which makes command-line calls to `git grep` to
>> search files. `git grep` has an `-O` or `--open-files-in-pager` option
>> which can spawn an arbitrary process (to act as pager). In vulnerable
>> versions of gollum, searching for the string `-O<arbitrary command>` or
>> `--open-files-in-pager <arbritary command>` in the wiki's search field
>> will execute an arbitrary shell command. However, this will only work if
>> the string "master" (or more precisely, the name of the git branch that
>> gollum is using) is found in one of the wiki's files: "master" is then
>> interpreted as the search query, `-O<arbitary code>` as a command line
>> option to `git grep`.
>>
>> The fix in the `gollum-grit_adapter` gem v.0.1.1 shell-escapes the
>> user's query and removes any -O or --open-file-in-pager option from it.
>>
>> [1] https://github.com/gollum/gollum, https://rubygems.org/gems/gollum
>> [2] https://github.com/gollum/grit_adapter
>> [3] https://github.com/gollum/gollum-lib

Use CVE-2014-9489.

---

CVE assignment team, MITRE CVE Numbering Authority M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]

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