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Ask the Team  Mailing Lists  Advertising Info  Advisories  About SecuriTeam  Blogs Brought to you by: Suppliers of: Website Testing Tools Network Testing Tools Software Testing Tools SecuriTeam in Your Inbox New vulnerability? New tool? Tell us (Our PGP key). CanSecWest 2012 2nd Annual Cyber Security Hack In Paris	Snom VoIP/SIP Phone Authentication Bypass of Web Interface 21 Aug. 2009    Summary he VoIP phones of snom technology AG can be configured, monitored or controlled with a browser connecting to the built in web interface. It is strongly recommended to enable authentication on the web interface and to set a strong password. By constructing a specially crafted HTTP request the authentication of the web interface can be completely bypassed.   Credit: The information has been provided by Walter Sprenger. The original article can be found at: http://www.csnc.ch/en/downloads/advisories.html Website Security Scan Code Vulnerability Test Network Assessment Tool Detect hidden vulnerabilities Exhaustive automated testing Real-time, continuous security Get guidance from professionals of internal or 3rd party code. scanning for your entire network    Details Protect your website! Use an External Vulnerability Scanner! Nothing to install. First report in 1 hour! www.beyondsecurity.com/vulnerability-scanner Vulnerable Systems:  * Snom360 linux 3.25/snom360-SIP 6.5.17  * Snom360 linux 3.25/snom360-SIP 6.5.18  * Snom360-SIP 7.1.30  * Snom360-SIP 7.1.35 14552  * Snom300, Snom320, Snom370 and Snom820 with firmware versions below 6.5.20, 7.1.39 and 7.3.14 Immune Systems:  * Snom Firmware version 6.5.20  * Snom Firmware version 7.1.39  * Snom Firmware version 7.3.14 The web interface of the Snom VoIP/SIP phones is protected by Basic Authentication or Digest Authentication. The authentication can be completely bypassed by modifying the HTTP request. A normal browser sets the request header "Host:" to the IP address or the host name that is entered in the URL field of the browser. If the request header is modified to contain the value "Host: 127.0.0.1", all pages and functions of the web interface can be reached without prompting the user to authenticate. Access to the web interface without authentication enables a malicious user to: - call expensive numbers - listen to the phone conversation by capturing the network traffic - read SIP username and password - read and modify all configuration parameters of the phone - redirect phone calls to another VoIP server - activate the microphone and listen to the conversation in the room Test: curl -H "Host: 127.0.0.1" http:/// curl -k -H "Host: 127.0.0.1" https:/// If the phone is vulnerable, the index page of the web interface is returned. If the phone is not vulnerable, an "HTTP/1.1 401 Unauthorized" response is returned. Workaround Disable the web interface until a firmware upgrade is installed. CVE Information: CVE-2009-1048 Disclosure Timeline: March 19, 2009 Vendor Notified March 19, 2009 Vendor Replied March 30, 2009 Vulnerability confirmed Vendor Response: Problem fixed in firmware version 7.1.39/7.3.14. Problem will be fixed in version 6. 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