CVE-2021-20563 : Security Advisory and Response

IBM Sterling File Gateway versions 2.2.0.0 through 6.1.0.3 contain a vulnerability that could allow a remote authenticated user to access sensitive information. By exploiting this flaw, an attacker could reveal a valid filepath on the server, leading to potential further system attacks.

Understanding CVE-2021-20657

This section delves into the details of CVE-2021-20657, its impacts, technical aspects, and mitigation strategies.

What is CVE-2021-20657?

The vulnerability in IBM Sterling File Gateway versions 2.2.0.0 through 6.1.0.3 enables a remote authenticated user to obtain sensitive information by sending a specially crafted request, potentially exposing a valid server filepath that could be leveraged in subsequent malicious activities.

The Impact of CVE-2021-20657

With a CVSS base score of 4.3 (Medium severity), this vulnerability poses a risk of disclosing sensitive data. Although the attack complexity is low and no privileges are required, the exploitation may result in information leakage and subsequent system compromise.

Technical Details of CVE-2021-20657

This section outlines the specific technical aspects of the CVE, including the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability allows a remote authenticated user to obtain sensitive information by revealing a valid server filepath through a specially crafted request.

Affected Systems and Versions

IBM Sterling File Gateway versions 2.2.0.0 through 6.1.0.3 are impacted by this vulnerability, exposing them to potential information disclosure by authenticated users.

Exploitation Mechanism

An attacker can exploit this vulnerability by sending a malicious request, enabling them to access sensitive data and potentially launch further attacks against the system.

Mitigation and Prevention

To address CVE-2021-20657 effectively, immediate steps should be taken, followed by long-term security practices and timely patching and updates.

Immediate Steps to Take

Organizations using affected versions of IBM Sterling File Gateway should apply the official fix provided by IBM to mitigate the risk of sensitive data exposure.

Long-Term Security Practices

Implement stringent access controls, regularly monitor server activity, and conduct security assessments to prevent unauthorized access.

Patching and Updates

Stay informed about security advisories from IBM and promptly apply patches and updates to protect your systems from known vulnerabilities.