CVE-2018-1311 Explained : Impact and Mitigation

CVE-2018-1311, assigned by Apache, pertains to a vulnerability in the XML parser of Apache Xerces-C version 3.0.0 to 3.2.3. The issue involves a use-after-free error during the scanning of external DTDs.

Understanding CVE-2018-1311

This CVE identifies a critical vulnerability in the Apache Xerces-C XML parser.

What is CVE-2018-1311?

The vulnerability in Apache Xerces-C version 3.0.0 to 3.2.3 triggers a use-after-free error when processing external DTDs, potentially leading to security breaches.

The Impact of CVE-2018-1311

The vulnerability can be exploited for Denial of Service (DoS) attacks and remote exploits, posing a significant risk to systems utilizing the affected versions.

Technical Details of CVE-2018-1311

Apache Xerces-C version 3.0.0 to 3.2.3 is susceptible to a use-after-free error during external DTD scanning.

Vulnerability Description

The issue arises from a flaw in the XML parser that fails to handle external DTDs properly, resulting in a use-after-free error.

Affected Systems and Versions

Vendor: Apache Software Foundation
Product: Apache Xerces-C
Affected Versions: 3.0.0 to 3.2.2

Exploitation Mechanism

The vulnerability can be exploited by malicious actors to execute DoS attacks or remote exploits by manipulating external DTDs.

Mitigation and Prevention

To address CVE-2018-1311, consider the following steps:

Immediate Steps to Take

Disable DTD processing by utilizing standard parser features through the DOM or setting the XERCES_DISABLE_DTD environment variable when using SAX.

Long-Term Security Practices

Regularly update and patch Apache Xerces-C to the latest version.
Implement secure coding practices and conduct regular security audits.

Patching and Updates

Stay informed about security advisories and updates from Apache and other relevant vendors.