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Cisco IP Phone 7940 SIP INVITE Denial of Service Vulnerability
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Secunia Advisory:
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SA27898
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Release Date:
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2007-12-06
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Last Update:
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2007-12-18
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Popularity:
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6,122 views
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Critical:
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Less critical
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Impact:
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DoS
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Where:
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From remote
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Solution Status:
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Unpatched
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| Software: | Cisco IP Phone 7940
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| CVE reference: | CVE-2007-5583
CVE-2007-6370
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Description:
The Madynes research team has reported a vulnerability in Cisco IP Phone 7940, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to the improper handling of SIP INVITE messages. This can be exploited to deny legitimate calls or to reboot the device by sending a series of SIP INVITE messages containing a "Request-URI" without a username.
Successful exploitation requires knowledge of a valid userid on the target phone.
NOTE: The vendor reportedly could not confirm a device reboot via SIP INVITE messages and states that a device is not affected when registered with a Cisco Unified Communications Manager (CUCM) server.
The vulnerability is reported in firmware version P0S3-08-7-00. Other versions may also be affected.
Solution:
Restrict network access to the vulnerable device.
Provided and/or discovered by:
Madynes research team at INRIA Lorraine.
Changelog:
2007-12-10: Added CVE reference. Updated "Description" section.
2007-12-18: Added CVE reference.
Original Advisory:
http://lists.grok.org.uk/pipermail/full-disclosure/2007-December/058837.html
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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