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CVE-2021-1379: Cisco IP Phones Cisco Discovery Protocol and Link Layer Discovery Protocol Remote Code Execution and Denial of Service Vulnerabilities

Description

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.

Affected products

How to fix

Upgrade to a fixed version: Cisco Ip Conference Phone 7832 Firmware 12.8\(1\); Cisco Ip Conference Phone 7832 With Multiplatform Firmware 11.3\(2\); Cisco Ip Conference Phone 8832 Firmware 12.8\(1\); Cisco Ip Conference Phone 8832 With Multiplatform Firmware 11.3\(2\); Cisco Ip Phone 6821 With Multiplatform Firmware 11.3\(2\); Cisco Ip Phone 6841 With Multiplatform Firmware 11.3\(2\); Cisco Ip Phone 6851 With Multiplatform Firmware 11.3\(2\); Cisco Ip Phone 6861 With Multiplatform Firmware 11.3\(2\); Cisco Ip Phone 6871 With Multiplatform Firmware 11.3\(2\); Cisco Ip Phone 7811 Firmware 12.8\(1\); Cisco Ip Phone 7811 With Multiplatform Firmware 11.3\(2\); Cisco Ip Phone 7821 Firmware 12.8\(1\). Check the vendor advisory for mitigations.

References

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