Cisco Small Business SPA50x, SPA51x, and SPA52x Series IP Phones SIP Denial of Service Vulnerability

by CIRT Team

22 Oct 2017

in Security Advisories & Alerts

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Description: A vulnerability in the implementation of Session Initiation Protocol (SIP) functionality in Cisco Small Business SPA50x, SPA51x, and SPA52x Series IP Phones could allow an unauthenticated, remote attacker to cause an affected device to become unresponsive, resulting in a denial of service (DoS) condition. The vulnerability is due to the improper handling of SIP request messages by an affected device. An attacker could exploit this vulnerability by using formatted specifiers in a SIP payload that is sent to an affected device. A successful exploit could allow the attacker to cause the affected device to become unresponsive, resulting in a DoS condition that persists until the device is restarted manually. This vulnerability affects Cisco Small Business SPA50x, SPA51x, and SPA52x Series IP Phones that are running firmware release 7.6.2SR1 or earlier. Cisco Bug IDs: CSCvc63986.

Impact: A remote attacker can exploit this issue to cause the web interface on a targeted system to become unresponsive, resulting in a denial-of-service condition.

Mitigation: Updates are available. Please check specific vendor advisory for more information.

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