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AUSCERT External Security Bulletin Redistribution
ESB-2019.2443.2
Cisco IP Phone 7800 and 8800 Series Session Initiation
Protocol Denial of Service Vulnerability
9 July 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IP Phone 7800 and 8800 Series
Publisher: Cisco Systems
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1922
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-ip-phone-sip-dos
Revision History: July 9 2019: Update from Cisco 1.1
July 4 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco IP Phone 7800 and 8800 Series Session Initiation Protocol Denial of
Service Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20190703-ip-phone-sip-dos
First Published: 2019 July 3 16:00 GMT
Last Updated: 2019 July 8 16:16 GMT
Version 1.1: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvc61672
CVE-2019-1922
CWE-476
CVSS Score:
5.3 AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o 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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190703-ip-phone-sip-dos
Affected Products
o 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.
Workarounds
o There are no workarounds that address this vulnerability.
Exploitation and Public Announcements
o 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.
Source
o Cisco would like to thank Thomas Sabono of xen1thLabs for reporting this
vulnerability.
Cisco Security Vulnerability Policy
o 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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190703-ip-phone-sip-dos
Revision History
o +---------+----------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+---------+----------------------------+----------+--------+--------------+
| | Removed Unified IP 8831 | Affected | | |
| 1.1 | Conference Phone from the | Products | Final | 2019-July-08 |
| | list of affected products. | | | |
+---------+----------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2019-July-03 |
+---------+----------------------------+----------+--------+--------------+
- --------------------------END INCLUDED TEXT--------------------
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