CVE-2022-20766 - DoS Vulnerability in Cisco ATA 190 Series Adaptive Telephone Adapter Firmware

A recent vulnerability (CVE-2022-20766) has been identified in the Cisco Discovery Protocol functionality of Cisco ATA 190 Series Adaptive Telephone Adapter firmware. This vulnerability could allow an unauthenticated, remote attacker to execute a Denial of Service (DoS) attack on the affected device, causing disruption in its operation.

Technical Details

This vulnerability is due to an out-of-bounds read when processing Cisco Discovery Protocol packets on the affected device. An attacker could exploit this vulnerability by sending crafted Cisco Discovery Protocol packets to a vulnerable device. A successful exploit of this vulnerability could cause the service to restart, leading to a temporary DoS condition.

The following code snippet demonstrates a sample exploit that sends a crafted malicious Cisco Discovery Protocol packet to the target device:

import socket

target_ip = '192.168..2'
source_ip = '192.168..1'
attacker_ip = '192.168..3'

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind((source_ip, ))

packet = bytearray()
# Add crafted Cisco Discovery Protocol header and payload here
# ...

sock.sendto(packet, (target_ip, ))

Mitigation

Cisco has acknowledged this vulnerability and has released firmware updates to address the issue. There are no known workarounds for this vulnerability, so it is recommended to apply the appropriate firmware update as soon as possible.

References

Please refer to the following Cisco advisories for further information and details on how to obtain and apply the required firmware updates:

1. Cisco Security Advisory
2. CVE-2022-20766 Detail

Conclusion

Organizations using Cisco ATA 190 Series Adaptive Telephone Adapter firmware should take note of the vulnerability CVE-2022-20766. It is important to update the affected devices with the latest firmware released by Cisco to prevent potential DoS attacks and disruptions in service. While no workarounds exist, the firmware update offers a crucial solution to address the vulnerability promptly.

Timeline

Published on: 11/15/2024 16:15:22 UTC
Last modified on: 11/18/2024 17:11:56 UTC