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AUSCERT External Security Bulletin Redistribution
ESB-2019.0533.2
Cisco IP Phone 7800 and 8800 Series Cisco Discovery Protocol and Link Layer
Discovery Protocol Denial of Service Vulnerability
11 March 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Wireless IP Phone 8821
Cisco IP Phone 8800 Series
Cisco Unified IP Conference Phone 8831
Cisco IP Phone 8865
Cisco IP Phone 8861
Cisco IP Phone 8800 Series
Cisco IP Phone 7841
Cisco IP Phone 7861
Cisco IP Conference Phone 8832
Cisco IP Phone 7811
Cisco IP Phone 7821
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1684
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190220-cdp-lldp-dos
Revision History: March 11 2019: Updated to version 1.1 from vendor
February 21 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco IP Phone 7800 and 8800 Series Cisco Discovery Protocol and Link Layer
Discovery Protocol Denial of Service Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20190220-cdp-lldp-dos
First Published: 2019 February 20 16:00 GMT
Last Updated: 2019 March 9 00:28 GMT
Version 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvn47250CSCvo54699CSCvo55040
CVE-2019-1684
CWE-399
CVSS Score:
6.5 AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the Cisco Discovery Protocol or Link Layer Discovery
Protocol (LLDP) implementation for the Cisco IP Phone 7800 and 8800 Series
could allow an unauthenticated, adjacent attacker to cause an affected
phone to reload unexpectedly, resulting in a temporary denial of service
(DoS) condition.
The vulnerability is due to missing length validation of certain Cisco
Discovery Protocol or LLDP packet header fields. An attacker could exploit
this vulnerability by sending a malicious Cisco Discovery Protocol or LLDP
packet to the targeted phone. A successful exploit could allow the attacker
to cause the affected phone to reload unexpectedly, resulting in a
temporary DoS condition.
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-20190220-cdp-lldp-dos
Affected Products
o Vulnerable Products
The following Cisco phone models are vulnerable:
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
Unified IP 8831 Conference Phone
Unified IP 8831 Conference Phone for Third-Party Call Control
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.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o For information about fixed software releases , consult the Cisco bug ID(s)
at the top of this advisory.
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 the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
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 This vulnerability was found during the resolution of a Cisco TAC support
case.
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-20190220-cdp-lldp-dos
Revision History
o +---------+----------------------+------------+--------+------------------+
| Version | Description | Section | Status | Date |
+---------+----------------------+------------+--------+------------------+
| | Added additional | | | |
| | CDETS defect | | | |
| 1.1 | identifiers. Updated | Vulnerable | Final | 2019-March-09 |
| | the list of | Products | | |
| | vulnerable phone | | | |
| | models. | | | |
+---------+----------------------+------------+--------+------------------+
| 1.0 | Initial public | - | Final | 2019-February-20 |
| | release. | | | |
+---------+----------------------+------------+--------+------------------+
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