Condorlab

Cisco – Bug in Cisco Small Business SPA51x Series IP Phone allow DoS


Advisory IDRSN-SIP-1792

Vulnerability Information

 

 

Vulnerability was reported in Cisco Small Business SPA51x Series IP Phones. A remote user can cause denial of service conditions on the target system.  A remote user can send specially crafted Session Initiation Protocol (SIP) request messages to the target device to cause the target device to become unresponsive. For more information on the affected versions, CVE-2017-12259 was assigned for this bug.


Technical Information

 

 

Vulnerability in the implementation of Session Initiation Protocol (SIP) functionality in Cisco Small Business SPA51x 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 sending malformed SIP messages 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 SPA51x Series IP Phones that are running Cisco SPA51x Firmware Release 7.6.2SR1 or earlier.


Solutions

 

 

The UCTM solution from RedShift Networks provides the industry’s first complete security solution developed to secure VOIP networks, endpoints and applications. His research team Condor-Labs.com is constantly looking for new attack patterns, advanced penetration testing methods, vulnerability identification and deployment of new signatures for constantly subscribed clients. For more information visit www.redshiftnetworks.com


External Resources

 

 

Cisco Security Advisory

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171018-sip

Common Vulnerabilities and Exposures (CVE)

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-12259