CVE-2019-19494 : Exploit Details and Defense Strategies

Broadcom-based cable modems across multiple vendors are vulnerable to a buffer overflow, allowing remote code execution at the kernel level through JavaScript. Affected products include Sagemcom, NETGEAR, Technicolor, and COMPAL devices.

Understanding CVE-2019-19494

This CVE identifies a critical vulnerability in Broadcom-based cable modems that can be exploited to execute arbitrary code remotely.

What is CVE-2019-19494?

The vulnerability in Broadcom-based cable modems enables attackers to run JavaScript in a victim's browser, leading to remote code execution at the kernel level.

The Impact of CVE-2019-19494

Attackers can exploit this flaw to remotely execute malicious code on affected devices.
This vulnerability poses a significant risk to the security and integrity of the impacted systems.

Technical Details of CVE-2019-19494

This section provides detailed technical information about the CVE.

Vulnerability Description

The buffer overflow vulnerability in Broadcom-based cable modems allows attackers to execute arbitrary code at the kernel level by leveraging JavaScript in the victim's browser.

Affected Systems and Versions

Products known to be affected include:

Sagemcom F@st 3890 versions prior to 50.10.21_T4 and 05.76.6.3f
Sagemcom F@st 3686 versions 3.428.0 and 4.83.0
NETGEAR CG3700EMR versions 2.01.05 and 2.01.03
NETGEAR C6250EMR versions 2.01.05 and 2.01.03
Technicolor TC7230 STEB 01.25
COMPAL 7284E version 5.510.5.11
COMPAL 7486E version 5.510.5.11

Exploitation Mechanism

The vulnerability can be exploited by running JavaScript in the browser of a targeted user, allowing remote attackers to execute arbitrary code at the kernel level.

Mitigation and Prevention

Protecting systems from CVE-2019-19494 requires immediate action and long-term security measures.

Immediate Steps to Take

Update affected devices to the latest firmware versions provided by the respective vendors.
Implement network segmentation to isolate vulnerable devices from critical systems.
Monitor network traffic for any suspicious activities that may indicate exploitation attempts.

Long-Term Security Practices

Regularly update and patch all network-connected devices to address known vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate potential weaknesses.
Educate users on safe browsing practices and the importance of keeping devices up to date.

Patching and Updates

Vendors have released patches to address the vulnerability. Ensure timely installation of these updates to mitigate the risk of exploitation.