CVE-2019-20201 Explained : Impact and Mitigation

A flaw in versions 0.8.3 to 0.8.6 of ezXML leads to memory allocation issues due to mishandling of XML entities.

Understanding CVE-2019-20201

This CVE involves vulnerabilities in ezXML versions 0.8.3 to 0.8.6, impacting memory allocation due to improper handling of XML entities.

What is CVE-2019-20201?

CVE-2019-20201 is a vulnerability found in ezXML versions 0.8.3 to 0.8.6. The issue arises from the mishandling of XML entities by the ezxml_parse_* functions, causing an endless loop leading to memory allocation problems.

The Impact of CVE-2019-20201

The vulnerability can result in denial of service (DoS) attacks, system crashes, or potentially allow attackers to execute arbitrary code on affected systems.

Technical Details of CVE-2019-20201

This section provides more technical insights into the vulnerability.

Vulnerability Description

The ezxml_parse_* functions in ezXML versions 0.8.3 to 0.8.6 mishandle XML entities, triggering an infinite loop that causes memory allocations, potentially leading to DoS or code execution.

Affected Systems and Versions

Versions 0.8.3 to 0.8.6 of ezXML are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious XML files that trigger the mishandling of XML entities, leading to the memory allocation issues.

Mitigation and Prevention

To address CVE-2019-20201, follow these mitigation strategies:

Immediate Steps to Take

Update ezXML to a patched version that addresses the XML entity handling flaw.
Implement input validation to prevent malicious XML files from triggering the vulnerability.

Long-Term Security Practices

Regularly monitor for security updates and patches for ezXML.
Conduct security assessments and audits to identify and remediate similar vulnerabilities.

Patching and Updates

Apply patches or updates provided by the ezXML project to fix the vulnerability and enhance system security.