CVE-2019-3971 Explained : Impact and Mitigation

Comodo Antivirus versions up to 12.0.0.6810 are susceptible to a local Denial of Service vulnerability affecting CmdVirth.exe via its LPC port "cmdvrtLPCServerPort". A low privileged local process can exploit this vulnerability, causing CmdVirth.exe and its child svchost.exe instances to terminate.

Understanding CVE-2019-3971

CmdVirth.exe, a component of Comodo Antivirus versions up to 12.0.0.6810, has a vulnerability that can be exploited by a local low privileged process to trigger a Denial of Service.

What is CVE-2019-3971?

The vulnerability in CmdVirth.exe allows a local low privileged process to exploit the LPC port "cmdvrtLPCServerPort" by sending an LPC_DATAGRAM, leading to a Denial of Service due to the use of hardcoded NULLs in a memcpy operation.

The Impact of CVE-2019-3971

The vulnerability results in the termination of both CmdVirth.exe and its associated svchost.exe instances, potentially disrupting the antivirus functionality and system stability.

Technical Details of CVE-2019-3971

Comprehensive technical insights into the vulnerability.

Vulnerability Description

Vulnerability Type: Denial of Service (DoS)
Component: CmdVirth.exe
Exploitation Vector: Local low privileged process

Affected Systems and Versions

Product: Comodo Antivirus
Versions Affected: Versions 12.0.0.6810 and below

Exploitation Mechanism

Exploitation involves establishing a connection to the LPC port and sending an LPC_DATAGRAM
Access Violation triggered by hardcoded NULLs in a memcpy operation

Mitigation and Prevention

Guidelines to address and prevent the CVE-2019-3971 vulnerability.

Immediate Steps to Take

Update Comodo Antivirus to a patched version
Monitor system logs for any suspicious activities

Long-Term Security Practices

Implement the principle of least privilege for user accounts
Regularly update antivirus software and security patches

Patching and Updates

Apply vendor-released patches promptly to mitigate the vulnerability