CVE-2021-27931 Explained : Impact and Mitigation

This article provides detailed information about CVE-2021-27931, a vulnerability in LumisXP (aka Lumis Experience Platform) before version 10.0.0 that allows unauthenticated blind XML External Entity (XXE) attacks via an API request to PageControllerXml.jsp.

Understanding CVE-2021-27931

CVE-2021-27931 is a security vulnerability in LumisXP that enables attackers to perform XXE attacks without authentication.

What is CVE-2021-27931?

LumisXP (aka Lumis Experience Platform) before 10.0.0 is susceptible to unauthenticated blind XXE attacks via a specially crafted API request to PageControllerXml.jsp. By exploiting this vulnerability, an attacker can manipulate XML input to access sensitive data or disrupt services.

The Impact of CVE-2021-27931

An attacker exploiting CVE-2021-27931 can potentially read local server files or launch denial-of-service attacks, posing a severe risk to the confidentiality, integrity, and availability of the affected systems.

Technical Details of CVE-2021-27931

The technical details of CVE-2021-27931 include the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability allows unauthenticated attackers to conduct blind XXE attacks through crafted API requests to PageControllerXml.jsp, leading to unauthorized access to files and potential service disruption.

Affected Systems and Versions

LumisXP versions prior to 10.0.0 are vulnerable to CVE-2021-27931, exposing them to exploitation through unauthenticated XXE attacks.

Exploitation Mechanism

Attackers can send malicious XXE payloads via API requests to PageControllerXml.jsp to trigger the vulnerability and perform unauthorized activities on the target system.

Mitigation and Prevention

To address CVE-2021-27931, immediate steps should be taken followed by long-term security practices and regular patching.

Immediate Steps to Take

Ensure that LumisXP is updated to version 10.0.0 or newer to mitigate the vulnerability. Monitor system logs for any suspicious activities that could indicate an ongoing attack.

Long-Term Security Practices

Implement proper input validation mechanisms, restrict API access, and conduct regular security assessments to detect and prevent similar vulnerabilities.

Patching and Updates

Regularly apply security patches provided by the vendor to address known vulnerabilities and enhance the overall security posture of LumisXP.