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Malicious Git and Mercurial HTTP Server For CVE-2014-9390

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Malicious Git and Mercurial HTTP Server For CVE-2014-9390

Disclosed
12/18/2014
Created
05/30/2018

Description

This module exploits CVE-2014-9390, which affects Git (versions less than 1.8.5.6, 1.9.5, 2.0.5, 2.1.4 and 2.2.1) and Mercurial (versions less than 3.2.3) and describes three vulnerabilities. On operating systems which have case-insensitive file systems, like Windows and OS X, Git clients can be convinced to retrieve and overwrite sensitive configuration files in the .git directory which can allow arbitrary code execution if a vulnerable client can be convinced to perform certain actions (for example, a checkout) against a malicious Git repository. A second vulnerability with similar characteristics also exists in both Git and Mercurial clients, on HFS+ file systems (Mac OS X) only, where certain Unicode codepoints are ignorable. The third vulnerability with similar characteristics only affects Mercurial clients on Windows, where Windows "short names" (MS-DOS-compatible 8.3 format) are supported. Today this module only truly supports the first vulnerability (Git clients on case-insensitive file systems) but has the functionality to support the remaining two with a little work.

Author(s)

  • Jon Hart <jon_hart@rapid7.com>

Development

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use exploit/multi/http/git_client_command_exec
msf exploit(git_client_command_exec) > show targets
    ...targets...
msf exploit(git_client_command_exec) > set TARGET < target-id >
msf exploit(git_client_command_exec) > show options
    ...show and set options...
msf exploit(git_client_command_exec) > exploit

Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.

– Jim O’Gorman | President, Offensive Security

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