AnywhereUSB/5 1.80.00 Drivers Integer Overflow

Advisory Content :

AnywhereUSB/5 1.80.00 Drivers Integer Overflow

Risk: low.
This advisory can be found here:
http://www.safend.com/advisories/digi_anywhereusb5_intoverflow.txt

I. BACKGROUND

AnywhereUSB/5 provides five USB ports, which deliver the same Plug and Play

user experience as onboard USB ports.

Software drivers are loaded onto a host PC or server, enabling remote
devices
to communicate with the host, without changing existing application
software.
Peripheral devices can be centrally managed and monitored from a remote
server or PC via an IP address.

http://www.digi.com/products/usb/anywhereusb.jsp

II. DESCRIPTION

This low-risk vulnerability in AnywhereUSB/5 1.80.00 allows an attacker to

forge an AnywhereUSB server, so that if a client connects to it, it can be

hit with a denial of service attack.

This integer overflow in version 1.80.00 of AnywhereUSB/5 drivers package
distributed for Windows NT 4.0/2000/XP and 2003. could allow attackers to
Bugcheck (BSOD) currently connected clients on demand, or any new client
upon
connection.

The problem exists within the parsing of USB string descriptors.
A malformed string descriptor that in its header specifies a size of 1
byte,
will cause a memory copy loop to go behind allocated memory range.

This will result in a Bugcheck (BSOD) within the client computer driver.

III. ANALYSIS

Successful exploitation allows an attacker to crash the client computer and

cause a Bugcheck (BSOD) on demand.

Exploitation is possible in two ways: by sending a specially crafted string

descriptor to the client or by attaching a maliciously crafted USB device
to
the hub.

IV. DETECTION

Safend has confirmed that AnywhereUSB/5 drivers version 1.80.00 is
vulnerable.
It is suspected that earlier versions of AnywhereUSB/5 may also
vulnerable.

V. WORKAROUND

Avoid plugging unknown USB devices into an AnywhereUSB/5 hub.

Apply strict firewalls rules, to prevent clients from connecting to a
malicious AnywhereUSB/5 server, which could in turn send the malformed
string
descriptor to the client via TCP/IP.

VI. VENDOR RESPONSE

SecuriTeam was asked to assist the researchers with contacting Digi
International.

Reported to vendor: 24th of July, 2006.
Vendor response: 25th of July, 2006.

Vendor's official response:
"The AnywhereUSB product is used with commercial USB peripheral devices on

dedicated point to point IP connections, almost always on non-public local

area networks. The likelihood of any such USB device producing a USB
descriptor corrupted in precisely this way is extremely unlikely. This
error
will be corrected in a future driver release."

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2006-4459 to this issue.

VIII. CREDIT

This vulnerability was discovered by Itzik Kotler, Safend.

IX. About SecuriTeam's Assisted Disclosure

Many researchers do not have the time, energy or inclination to deal with
reporting a vulnerability to vendors.

SecuriTeam is here to help. If you want us to handle the logistics of
contacting and following up with the vendor, making sure the problem is
fixed, contact: STAD (at) SecuriTeam (dot) com. [email concealed]

Our end goal is Full Disclosure, preferably in coordination with the
vendor,
without exposing the researcher to unnecessary risk. We do not believe in
hiding or selling vulnerabilities. Never had, never will.

All credit will be properly attributed. If asked we can act as proxies,
keeping your privacy and anonymity.

X. LEGAL NOTICES

Disclaimer: The information in the advisory is believed to be accurate at
the
time of publishing based on currently available information. Use of the
information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the author

nor the publisher accepts any liability for any direct, indirect, or
consequential loss or damage arising from use of, or reliance on, this
information.

---

Safend is a leading provider of innovative endpoint security solutions that

protect against corporate data leakage and penetration via physical and
wireless ports. For more information, visit http://www.safend.com/.

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AnywhereUSB/5 1.80.00 Drivers Integer Overflow