[R2] Logitech Harmony Hub Multiple Vulnerabilities

Tenable found multiple vulnerabilities in Logitech's Harmony Hub.

CVE-2018-15720: XMPP Default Accounts

The XMPP server contains two undocumented default accounts. The accounts have the same privileges as any normal authenticated user.

File: luaworks/tasks/connectserver/core/xmppconnection.lua.out.lua

Function:
	processAuthenticate = function(self, str)
		-- function num : 0_12 , upvalues : AUTH_GUEST, AUTH_YES, AUTH_NO
		if str == "AGd1ZXN0AGd1ZXN0" or str == "Z3Vlc3QAZ3Vlc3QA" then
		    self.clientJid = "guest"
		    self.authenticated = AUTH_GUEST

CVE-2018-15721: XMPP Authentication Bypass

A crafted XMPP request can be used to bypass authentication. When an XMPP request doesn't contain an oa element to initialize the identity variable, it remains uninitialized. The authenticate function will return any username passed to it.

File: luaworks/tasks/connectserver/core/xmppconnection.lua.out.lua
Function:
	processAuthenticate = function(self, str)
	...
	    if self:authenticate(str) then
	      self.clientJid = "1111"
	      self.authenticated = AUTH_YES

    ...
	authenticate = function(self, userName)
	  -- function num : 0_11
	  if not self.identity then
	    return userName

    ...
	processHlapiRequest = function(self, cmd, parameters)
		...
	    if (response.data).identity then
	      self.identity = (response.data).identity

CVE-2018-15722: Remote Server OS Command Injection

On boot, the device makes a time synchronization request to a remote server. The server's response is eventually used in an operating system shell command via the Lua os.execute function in timemanager.lua. A remote attacker is able to inject OS commands due to lack of validation.

CVE-2018-15723: Crafted HTTP Request Application Command Injection

A crafted HTTP request allows a remote unauthenticated attacker to execute application level commands (e.g. harmony.system?systeminfo). HTTP POST requests to port 8088 with a forged HTTP origin header can are implicitly trusted by the device. A proof of concept follows:

curl -d "{\"cmd\":\"harmony.system?systeminfo\"}" -H "Origin: .myharmony.com" -H "Content-Type: application/json" "http://192.168.0.176:8088"

{"msg":"OK","data":{"unit_id":"20170121214639-000143","fw_type":"0x00","fw_ver":"4.15.193","arch":"0x11","hw_ver":"0x00","usb_product_id":"0xC129","skin":"106","usb_vendor_id":"0x046D"},"code":"200"}