[NT] Trillian Remote DoS (Malformed TypingUser)

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To: list@securiteam.com
Date: 6 Jul 2003 19:13:08 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  Trillian Remote DoS (Malformed TypingUser)
------------------------------------------------------------------------

SUMMARY

 <http://www.ceruleanstudios.com/trillian/index.html> Trillian allows you
to "chat with friends on different networks! Grab the latest news, weather
and stock information with our versatile array of plugins, all within one
powerful interface". The product has been found to contain a security
vulnerability that allows remote attackers to cause the product to crash,
this is done by sending a malformed TypingUser tag.

DETAILS

Vulnerable systems:
 * Trillian version 1.0 Pro
 * Trillian version 0.74 Freeware

It is possible to crash Trillian by sending a corrupt 'TypingUser'
message. Replacing any of the characters in 'TypingUser' will cause
Trillian to crash. If more then 10 characters are used, or if the colon is
omitted, Trillian will not crash. The crash occurs due to a function
within msn.dll for both Trillian 1 and 0.74.

In order to exploit this condition, no code is necessary- simply hex edit
a messenger client, replacing the string 'TypingUser' with any other
string of the same length (or simply changing a letter or two). However
this method of exploitation does break Microsoft's EULA/TOS, and you are
not encouraged to utilize a broken client in this way except in an
educational context. This 'hack' also prevents other non-Trillian
Messenger clients from detecting when a user is typing.

Crash Summary:
MOV ECX,DWORD PTR DS:[EDX] ; EDX is uninitialized

The crash looks something like this:
Instruction at 0x####8826 referenced memory at 0x00000000

Sample TCP session to crash Trillian:
MIME-Version: 1.0
Content-Type: text/x-msmsgscontrol
TypingXxxx: attacker@blah.com

ADDITIONAL INFORMATION

The information has been provided by <mailto:flur@flurnet.org> flur.

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