CVE-2021-27197 : Vulnerability Insights and Analysis

DSUtility.dll in Pelco Digital Sentry Server before 7.19.67 is vulnerable to an arbitrary file write issue. This vulnerability arises from the AppendToTextFile method failing to verify if it's invoked by the application or a malicious actor. Threat actors can exploit this flaw by creating crafted HTML pages to overwrite arbitrary files.

Understanding CVE-2021-27197

This section dives into the details of CVE-2021-27197, outlining its impact and technical aspects.

What is CVE-2021-27197?

DSUtility.dll in Pelco Digital Sentry Server prior to version 7.19.67 contains a vulnerability that allows remote attackers to perform unauthorized file writing operations. This flaw occurs due to the insufficient validation in the AppendToTextFile method, enabling malicious users to overwrite arbitrary files.

The Impact of CVE-2021-27197

The arbitrary file write vulnerability in DSUtility.dll can be exploited by threat actors to manipulate critical system files, leading to unauthorized access, data theft, or even system compromise. This could have severe consequences for organizations that utilize Pelco Digital Sentry Server.

Technical Details of CVE-2021-27197

This section delves into the technical aspects of CVE-2021-27197, providing insights into the vulnerability description, affected systems, and exploitation method.

Vulnerability Description

The flaw in DSUtility.dll arises from inadequate validation in the AppendToTextFile method, allowing remote attackers to overwrite arbitrary files by crafting malicious HTML pages.

Affected Systems and Versions

Pelco Digital Sentry Server versions before 7.19.67 are impacted by this vulnerability, making systems running these versions susceptible to arbitrary file manipulation.

Exploitation Mechanism

Threat actors can exploit this vulnerability by creating HTML pages with specific elements to trigger the AppendToTextFile method, enabling them to overwrite files without proper validation.

Mitigation and Prevention

In this section, we discuss the steps to mitigate the risks associated with CVE-2021-27197 and prevent potential exploitation.

Immediate Steps to Take

Organizations using Pelco Digital Sentry Server should update to version 7.19.67 or apply vendor-supplied patches to address this vulnerability. It is crucial to ensure that systems are regularly patched and updated to prevent unauthorized file modifications.

Long-Term Security Practices

Implementing robust security measures, such as access controls, network segmentation, and security monitoring, can help mitigate the risks of arbitrary file write vulnerabilities. Regular security audits and employee training on identifying malicious content are essential to bolster overall cybersecurity defenses.

Patching and Updates

Regularly monitor vendor security advisories and apply patches promptly to mitigate security vulnerabilities. Organizations should establish clear patch management procedures to ensure timely deployment of security updates and protect systems from potential cyber threats.