CVE-2020-9499 : Exploit Details and Defense Strategies

Some Dahua products have buffer overflow vulnerabilities that can be exploited by sending a specific DDNS test command after a successful login, potentially causing the device to crash.

Understanding CVE-2020-9499

This CVE involves a Denial of Service vulnerability affecting certain Dahua products.

What is CVE-2020-9499?

CVE-2020-9499 is a buffer overflow vulnerability in Dahua products that allows attackers to crash devices by sending a specific DDNS test command post successful login.

The Impact of CVE-2020-9499

The vulnerability can lead to a Denial of Service (DoS) condition, disrupting the normal operation of affected devices.

Technical Details of CVE-2020-9499

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

Vulnerability Description

The vulnerability in Dahua products allows for buffer overflow, triggered by a specific DDNS test command after a legal account login.

Affected Systems and Versions

Products: IPC-HX2XXX Series, IPC-HXXX5X4X Series, IPC-HX5842H, IPC-HX7842H, NVR 5x Series, NVR 4x Series, SD6AL Series, SD5A Series, SD1A Series, PTZ1A Series, SD50/52C Series
Versions: Build time before December 2019

Exploitation Mechanism

After logging in with a legal account, an attacker can exploit the vulnerability by sending a specific DDNS test command, leading to a device crash.

Mitigation and Prevention

Protecting systems from CVE-2020-9499 is crucial to maintaining security.

Immediate Steps to Take

Update affected Dahua products to versions released after December 2019.
Implement network segmentation to isolate vulnerable devices.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update firmware and software to patch known vulnerabilities.
Conduct security assessments and penetration testing to identify and address weaknesses.

Patching and Updates

Check for security advisories from Dahua and apply patches promptly to mitigate the risk of exploitation.