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aim.v5-overflow.txt

aim.v5-overflow.txt
Posted Oct 21, 2003
Authored by AngryB | Site digitalpranksters.com

AOL Instant Messenger prior to v5.5.3415 contains a buffer overflow in the CCertsByUserName::Cleanup() function which can lead to remote code execution. Can be exploited via HTML web pages or email via long aim: URIs. Fix available here.

tags | advisory, remote, web, overflow, code execution
SHA-256 | 658bc232448de8aa479f016c69377dec0c4df2e3dc1edc3e917f281631ca4178

aim.v5-overflow.txt

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TITLE:
AOL Instant Messenger File Transfer Error Message Buffer Overflow
Vulnerability

SECUNIA ADVISORY ID:
SA10021

VERIFY ADVISORY:
http://www.secunia.com/advisories/10021/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
From remote

SOFTWARE:
AOL Instant Messenger 5.x

DESCRIPTION:
A vulnerability has been identified in AOL Instant Messenger (AIM),
which potentially can be exploited by malicious people to compromise
a user's system.

The vulnerability is caused due to a boundary error in the
"CCertsByUserName::Cleanup()" function in "AimSecondarySvcs.dll" when
constructing certain error messages. The problem is that a
"sprintf()" function is used insecurely when constructing an error
message to inform the user that the connection with a specified user
was unsuccessful.

This can be exploited via a user's browser by constructing a
specially crafted link that uses the "aim:" URI handler and requests
a "getfile" operation, which supplies an overly long, specially
crafted string to the "screenname" parameter.

Example:
aim:getfile?screenname=AAA...[x1130]...AAA

Successful exploitation causes a buffer overflow and may potentially
allow execution of arbitrary code. However, it requires the
following:

1) A user has to be tricked into visiting a malicious website or
clicking a specially crafted link.
2) The user clicks "OK" when an anti-virus warning dialog box pops up
unless it has been disabled previously.

The vulnerability has been confirmed in version 5.2.3292 for Windows.
However, other versions may also be affected.

SOLUTION:
The vulnerability has been fixed in the latest beta (version 5.5.3415
Beta).
http://www.aim.com/get_aim/win/win_beta.adp

REPORTED BY / CREDITS:
AngryB, Digital Pranksters.

ORIGINAL ADVISORY:
Buffer Overflow in AOL Instant Messager's screenname parameter of
getfile:
http://www.digitalpranksters.com/advisories/aol/AIMProtocolBO.html

----------------------------------------------------------------------

Secunia recommends that you verify all advisories you receive, by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

Contact details:
Web : http://www.secunia.com/
E-mail : support@secunia.com
Tel : +45 7020 5144
Fax : +45 7020 5145

----------------------------------------------------------------------

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