Multiple vulnerabilities in the Cisco Discovery Protocol and Link Layer Discovery Protocol (LLDP) implementations for Cisco IP Phone Series 68xx/78xx/88xx could allow an unauthenticated, adjacent attacker to execute code remotely or cause a reload of an affected IP phone. These vulnerabilities are due to missing checks when the IP phone processes a Cisco Discovery Protocol or LLDP packet. An attacker could exploit these vulnerabilities by sending a malicious Cisco Discovery Protocol or LLDP packet to the targeted IP phone. A successful exploit could allow the attacker to execute code on the affected IP phone or cause it to reload unexpectedly, resulting in a denial of service (DoS) condition. Note: Cisco Discovery Protocol is a Layer 2 protocol. To exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent). Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities. This advisory is available at the following link:https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipphone-rce-dos-U2PsSkz3
Multiple vulnerabilities in the Cisco Discovery Protocol and Link Layer Discovery Protocol (LLDP) implementations for Cisco IP Phone Series 68xx/78xx/88xx could allow an unauthenticated, adjacent attacker to execute code remotely or cause a reload of an affected IP phone.
These vulnerabilities are due to missing checks when the IP phone processes a Cisco Discovery Protocol or LLDP packet. An attacker could exploit these vulnerabilities by sending a malicious Cisco Discovery Protocol or LLDP packet to the targeted IP phone. A successful exploit could allow the attacker to execute code on the affected IP phone or cause it to reload unexpectedly, resulting in a denial of service (DoS) condition.
Note: Cisco Discovery Protocol is a Layer 2 protocol. To exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).
Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipphone-rce-dos-U2PsSkz3
At the time of publication, these vulnerabilities affected the following Cisco IP phones with Cisco Discovery Protocol or LLDP enabled and running a vulnerable firmware release:
Cisco Discovery Protocol and LLDP are enabled by default on most IP Phone models.
For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
Only products listed in the Vulnerable Products section of this advisory are known to be affected by these vulnerabilities.
Cisco has confirmed that these vulnerabilities do not affect the following Cisco products:
There are no workarounds that address these vulnerabilities.
When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories 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.
At the time of publication, the release information in the following table(s) was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
The left column lists Cisco software releases, and the right column indicates whether a release was affected by the vulnerabilities described in this advisory and which release included the fix for these vulnerabilities.
Cisco IP Phone Model | Cisco Bug ID | First Fixed Release |
---|---|---|
IP Conference Phone 8832 with Multiplatform Firmware IP Conference Phone 7832 with Multiplatform Firmware IP Phone 6821, 6841, 6851, 6861, 6871 with Multiplatform Firmware IP Phone 7811, 7821, 7841, 7861 Desktop Phones with Multiplatform Firmware IP Phone 8811, 8841, 8851, 8861, 8845, 8865 Desktop Phones with Multiplatform Firmware |
CSCvu59335 | 11.3(2) |
IP Phone 8811, 8841, 8851, 8861, 8845, 8865 Desktop Phones IP Conference Phone 7832 IP Conference Phone 8832 IP Phone 7811, 7821, 7841, 7861 Desktop Phones |
12.8(1)SR1 | |
Unified IP Conference Phone 8831 | CSCvu59346 | 10.3(1)SR7. Target release May 2021 |
Unified IP Conference Phone 8831 for Third-Party Call Control | CSCvu59330 | There is no fixed firmware available at this time. |
SPA525G 5-Line IP Phone | CSCvu59329 | There is no fixed firmware available at this time. |
Cisco Unified IP Phone 7900 Series | CSCvu59353 | There is no fixed firmware available at this time. |
Wireless IP Phone 8821 and 8821-EX | CSCvu59351 | 11.0(6.6) |
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
Cisco would like to thank Qian Chen of Qihoo 360 Nirvan Team for reporting these vulnerabilities.
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.
Version | Description | Section | Status | Date |
---|---|---|---|---|
1.0 | Initial public release. | - | Final | 2021-MAR-03 |
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