Cisco Unified IP Phone RTP header denial of service

cisco-unifiedipphone-rtp-dos (47948)

Medium Risk

Description:

Cisco Unified IP Phones 7960G and 7940G are vulnerable to a denial of service, caused by improper handling of RTP headers. By sending a specially-crafted RTP packet to a vulnerable device, the attacker could cause the phone to reboot, resulting in a denial of service.

*CVSS:

Base Score:	5
Access Vector:	Network
Access Complexity:	Low
Authentication:	None
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	Partial
Temporal Score:	3.9
Exploitability:	Proof-of-Concept
Remediation Level:	Official-Fix
Report Confidence:	Confirmed

Consequences:

Denial of Service

Remedy:

Upgrade to the latest firmware version (8.10 or later), available to registered customers from the Cisco Web site. See References.

References:

• BugTraq Mailing List, Wed Jan 14 2009 - 06:29:32 CST : Cisco Unified IP Phone 7960G and 7940G (SIP) RTP Header Vulnerability.
• Cisco Web site: Downloads - Voice and Unified Communications - Cisco Systems.
• BID-33264: Cisco Unified IP Phone 7960G and 7940G RTP Remote Denial of Service Vulnerability
• CVE-2008-4444: Cisco Unified IP Phone (aka SIP phone) 7960G and 7940G with firmware P0S3-08-9-00 and possibly other versions before 8.10 allows remote attackers to cause a denial of service (device reboot) or possibly execute arbitrary code via a Realtime Transport Protocol (RTP) packet with malformed headers.

Platforms Affected:

• Cisco Unified IP Phone 7940G
• Cisco Unified IP Phone 7960G

Reported:

Jan 14, 2009

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