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TITLE:
Grandstream BudgeTone 200 SIP Messages "WWW-Authenticate" Denial of
Service

SECUNIA ADVISORY ID:
SA24538

VERIFY ADVISORY:
http://secunia.com/advisories/24538/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

OPERATING SYSTEM:
Grandstream BudgeTone 200 Series SIP Phones
http://secunia.com/product/13725/

DESCRIPTION:
A vulnerability has been reported in Grandstream BudgeTone 200 SIP
Phone, which can be exploited by malicious people to cause a DoS
(Denial of Service).

The vulnerability is caused due to an error within the processing of
"WWW-Authenticate" headers in SIP messages. This can be exploited to
cause the device to crash via a SIP message (e.g. INVITE or CANCEL)
containing a "WWW-Authenticate" header with a specially crafted
"Digest domain" attribute.

The vulnerability is reported in devices with firmware version
1.1.1.14. Other versions may also be affected.

SOLUTION:
Use another product.

PROVIDED AND/OR DISCOVERED BY:
Humberto J. Abdelnur, Radu State, and Olivier Festor

ORIGINAL ADVISORY:
http://lists.grok.org.uk/pipermail/full-disclosure/2007-March/053099.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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Please Note:
Secunia recommends that you verify all advisories you receive by
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Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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