[NT] mIRC Buffer Overflow (irc:// Links)

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To: list@securiteam.com
Date: 13 Oct 2003 14:25:22 +0200

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  mIRC Buffer Overflow (irc:// Links)
------------------------------------------------------------------------

SUMMARY

 <http://www.mirc.com > mIRC "attempts to provide a user-friendly
interface for use with the Internet Relay Chat network. The IRC network is
a virtual meeting place where people from all over the world can meet and
talk".

A buffer overflow in the way mIRC handle irc:// links allows remote
attackers to cause the program to execute arbitrary code.

DETAILS

Vulnerable systems:
 * mIRC version 6.1 and prior

Immune systems:
 * mIRC version 6.11

When mIRC is installed, it registers its own handler for URL of the type
"irc". Calling "irc://irc.hackme.com" from our web browser causes mirc.exe
to be executed and ready to connect to irc.hackme.com server. By inputting
an overly long string to the "irc" protocol, an attacker is able to
overwrite the saved instruction pointer, thus controls the program's
execution.

Example:
irc://[buffer]...... where's buffer >998 bytes

An attacker would be able to gain access to the target system if he was
able to trick the user to load his special crafted URL. Hence, he can have
his code executed under the current user's privilege.

Vendor status:
Author has released a newer version (6.11) which fixes the issue,
available at <http://www.mirc.com/get.html> http://www.mirc.com/get.html.

ADDITIONAL INFORMATION

The information has been provided by <mailto:dphuong@yahoo.com> Phuong
Nguyen.

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