CVE-2019-1766 Explained : Impact and Mitigation

A vulnerability in the web-based administration interface of SIP Software for Cisco IP Phone 8800 Series could lead to a denial of service (DoS) event by causing excessive disk space utilization.

Understanding CVE-2019-1766

This CVE involves a flaw in the Cisco IP Phone 8800 Series software that could be exploited by an unauthorized individual lacking authentication.

What is CVE-2019-1766?

The vulnerability allows an attacker with valid administrator credentials to create a file consuming significant disk space, disrupting application functions and causing a DoS event.

The Impact of CVE-2019-1766

The exploit could result in abnormal operation of the affected system due to excessive disk space usage, potentially leading to a DoS event.

Technical Details of CVE-2019-1766

This section provides more in-depth technical information about the vulnerability.

Vulnerability Description

The flaw arises from a lack of restrictions on file size that can be written to the system's disk through a specially crafted remote connection request.

Affected Systems and Versions

Product: Cisco IP Phone 8800 Series Software
Vendor: Cisco
Versions Affected: Less than 12.5(1)SR1

Exploitation Mechanism

To exploit the vulnerability, the attacker must have valid administrator credentials and send a crafted remote connection request to the affected system.

Mitigation and Prevention

Steps to address and prevent the CVE-2019-1766 vulnerability.

Immediate Steps to Take

Apply the latest security patches from Cisco.
Monitor disk space usage on affected systems.
Restrict access to the web-based administration interface.

Long-Term Security Practices

Regularly update software and firmware on Cisco IP Phone 8800 Series.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Ensure that all systems are updated with the latest SIP Software release, version 12.5(1)SR1.