innovaphone IP222 UDP Denial Of Service

Credit: Sven Freund
Risk: Medium
Local: No
Remote: Yes

Advisory ID: SYSS-2016-016 Product: innovaphone IP222 Manufacturer: innovaphone AG Affected Version(s): 11r2 sr9 Tested Version(s): 11r2 sr9 Vulnerability Type: Improper Input Validation (CWE-20) Risk Level: High Solution Status: Fixed Manufacturer Notification: 2016-03-04 Solution Date: Unknown Public Disclosure: 2016-03-24 CVE Reference: Not yet assigned Author of Advisory: Sven Freund (SySS GmbH) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Overview: The innovaphone IP222 is a Voice over IP telephone solution, which provides many communication functionalities, for instance, announcement function, password protected administration via web browser (HTTPS), multiple registration up to six users at the same time and many other features. The manufacturer innovaphone AG describes the product as follows (see [1]): "The IP222 telephone unites a very modern design with groundbreaking technological details. It belongs to the innovaphone product family that won the popular 'red dot award: product design'." ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Vulnerability Details: The innovaphone IP222 offers different protocols, like H.323 or SIP, to fulfil the various requirements. The discovered vulnerability was found in the protocol SIP/UDP. Therefore a specially crafted SIP request to the open 5060/UDP port causes a denial of service condition by crashing the innovaphone IP222 phone immediately. Remote code execution via this security vulnerability may also be possible, but was not confirmed by the SySS GmbH. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Proof of Concept (PoC): The SySS GmbH developed a proof-of-concept software tool for crashing the innovaphone IP222 with a specially crafted SIP request by causing a buffer overflow. sip = (method +" sip:105@" + server + " SIP/2.0\r\n" "To: <sip:" + server + ":5060>\r\n" "Via: SIP/2.0/UDP " + <ATTACK> + " xxx;x:5060;branch=z9hG4bK00003510 00001\r\n" "From: \x22xtestsip\x22<sip:" + server + "@dude>\r\n" "Call-ID: 1@dude\r\n" "CSeq: 1 " + method + "\r\n" "Content-Length: 0\r\n\r\n") The variable <ATTACK> must be replaced by a string which contains at least 3878 characters. After transmitting this SIP request to the innovaphone IP222, the VoIP phone will crash and restart immediately. Remote code execution via this security vulnerability may also be possible, but was not confirmed by the SySS GmbH. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Solution: According to information by the innovaphone AG, the described security issue has been fixed in software version v12r1 / v11r2sr11 / v10sr32. Please contact the manufacturer for further information or support. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclosure Timeline: 2016-03-04: Vulnerability reported to manufacturer 2016-03-09: Manufacturer acknowledges e-mail with SySS security advisory and described the security issue as fixed 2016-03-24: Public release of security advisory ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ References: [1] Product Web Site for innovaphone IP222 [2] SySS Security Advisory SYSS-2016-016 [3] SySS Responsible Disclosure Policy ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Credits: This security vulnerability was found by Sven Freund of the SySS GmbH. E-Mail: sven.freund (at) Public Key: Key fingerprint = DCDB 7627 C1E3 9CE8 62DF 2666 8A5F A853 415D 46DC ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclaimer: The information provided in this security advisory is provided "as is" and without warranty of any kind. Details of this security advisory may be updated in order to provide as accurate information as possible. The latest version of this security advisory is available on the SySS Web site. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Copyright: Creative Commons - Attribution (by) - Version 3.0 URL:

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