Synopsis
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"}
Solution
Upgrade to firmware version 4.15.206 or higher.
Disclosure Timeline
10/31/2018 - Notified Logitech. 90 day set to Jan 29
11/01/2018 - Logitech PSIRT confirms receipt.
11/13/2018 - Logitech PSIRT indicates patches will be out before Christmas.
11/13/2018 - Tenable thanks Logitech for the update.
12/07/2018 - Tenable asks for an update.
12/11/2018 - Logitech releases firmware version 4.15.206. Does not tell Tenable.
12/19/2018 - Tenable reads news coverage of a Harmony Hub firmware update.
12/19/2018 - Tenable asks Logitech PSIRT if the firmware update addressed the vulnerabilities we reported.
12/19/2018 - After a brief analysis Tenable confirms that the firmware update did fix our reported vulnerabilities.
12/19/2018 - Tenable publishes an advisory.
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