CVE-2020-7248 : Security Advisory and Response

OpenWrt's libubox before versions 18.06.7 and 19.x before 19.07.1 is vulnerable to a tagged binary data JSON serialization flaw that can lead to a stack-based buffer overflow.

Understanding CVE-2020-7248

This CVE involves a specific vulnerability in OpenWrt's libubox library that could potentially be exploited by attackers.

What is CVE-2020-7248?

CVE-2020-7248 is a tagged binary data JSON serialization vulnerability in libubox in OpenWrt versions prior to 18.06.7 and 19.x before 19.07.1.

The Impact of CVE-2020-7248

The vulnerability may allow an attacker to trigger a stack-based buffer overflow, potentially leading to arbitrary code execution or denial of service.

Technical Details of CVE-2020-7248

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The vulnerability in libubox in OpenWrt versions before 18.06.7 and 19.x before 19.07.1 arises from improper handling of tagged binary data during JSON serialization, which can result in a stack-based buffer overflow.

Affected Systems and Versions

OpenWrt versions prior to 18.06.7
OpenWrt 19.x versions before 19.07.1

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious JSON data to trigger the stack-based buffer overflow, potentially leading to the execution of arbitrary code or a denial of service.

Mitigation and Prevention

Protecting systems from CVE-2020-7248 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update OpenWrt to version 18.06.7 or 19.07.1, which contain patches addressing this vulnerability.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

Apply the latest security patches provided by OpenWrt to mitigate the CVE-2020-7248 vulnerability.