Cisco Security Advisory
Cisco IP Phone 7800 and 8800 Series Session Initiation Protocol Denial of Service Vulnerability
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CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
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A vulnerability in Cisco SIP IP Phone Software for Cisco IP Phone 7800 Series and 8800 Series could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected phone.
The vulnerability is due to insufficient validation of input Session Initiation Protocol (SIP) packets. An attacker could exploit this vulnerability by altering the SIP replies that are sent to the affected phone during the registration process. A successful exploit could allow the attacker to cause the phone to reboot and not complete the registration process.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-ip-phone-sip-dos
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The information provided in this advisory is the best available information as of the time of publication. Please consult the Release Note Enclosure on any associated bug ID for the most complete, accurate, and up-to-date information.
When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release.
If additional information is needed, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
Vulnerable Products
This vulnerability affects the following Cisco products:
- IP Conference Phone 7832
- IP Conference Phone 8832
- IP Phone 7800 Series with Multiplatform Firmware
- IP Phone 7811
- IP Phone 7821
- IP Phone 7841
- IP Phone 7861
- IP Phone 8800 Series
- IP Phone 8800 Series - VPN feature
- IP Phone 8811
- IP Phone 8841
- IP Phone 8845
- IP Phone 8845 with Multiplatform Firmware
- IP Phone 8851
- IP Phone 8861
- IP Phone 8865
- IP Phone 8865 with Multiplatform Firmware
For information about affected software releases, consult the Cisco bug ID(s) at the top of this advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
Fixed Releases
For information about fixed software releases, consult the Cisco bug ID(s) at the top of this advisory.
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There are no workarounds that address this vulnerability.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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Cisco would like to thank Thomas Sabono of xen1thLabs for reporting this vulnerability.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.1 Removed Unified IP 8831 Conference Phone from the list of affected products. Affected Products Final 2019-July-08 1.0 Initial public release. - Final 2019-July-03
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