CVE-2021-32754 : Exploit Details and Defense Strategies

FlowDroid versions prior to 2.9.0 are affected by an XML external entity (XXE) vulnerability. This vulnerability could allow an attacker to read files from external locations by controlling the source/sink definition file in XML format.

Understanding CVE-2021-32754

This CVE relates to an improper restriction of XML external entity references in the de.tud.sse package in FlowDroid.

What is CVE-2021-32754?

FlowDroid, a data flow analysis tool, had a security vulnerability in versions before 2.9.0 that allowed attackers to exploit XML external entities.

The Impact of CVE-2021-32754

The vulnerability could be exploited by an attacker with control over the XML-based source/sink definition file, potentially leading to unauthorized access to sensitive information.

Technical Details of CVE-2021-32754

FlowDroid's CVE-2021-32754 vulnerability has the following technical details:

Vulnerability Description

The XML external entity (XXE) vulnerability in FlowDroid versions prior to 2.9.0 allowed unauthorized file access through the source/sink definition file.

Affected Systems and Versions

FlowDroid versions before 2.9.0 are affected by this vulnerability.

Exploitation Mechanism

An attacker could exploit this vulnerability by manipulating the XML-based source/sink definition file.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-32754, consider the following:

Immediate Steps to Take

Ensure that untrusted entities do not control the source/sink definition file to prevent exploitation.

Long-Term Security Practices

Regularly update to the latest version of FlowDroid to apply security patches and protect against known vulnerabilities.

Patching and Updates

The vulnerability was patched in version 2.9.0 of FlowDroid. Stay updated with security advisories and promptly apply patches to secure your system.