CVE-2021-36356 is a critical vulnerability affecting Kramer VIAware, which allows remote attackers to execute arbitrary code. This vulnerability exists due to the improper handling of executable pathnames in the ajaxPages/writeBrowseFilePathAjax.php script. Although the browseSystemFiles.php file is no longer accessible via the graphical user interface, the vulnerability remains exploitable. The issue is compounded by an incomplete fix for CVE-2019-17124.
With a CVSS score of 9.8, this vulnerability is classified as critical. The high severity level indicates that organizations are at significant risk, as the attack vector is network-based, requiring no privileges or user interaction. This situation heightens the urgency for organizations to address the vulnerability promptly.
Risk to organizations includes potential unauthorized access and control over affected systems, which can lead to data breaches and system integrity issues. Given the critical nature of this vulnerability, organizations should prioritize patching immediately.
As of now, there are confirmed exploits available, emphasizing the need for swift remediation to prevent potential attacks.
Vulnerability Details
This vulnerability allows remote attackers to execute arbitrary code because ajaxPages/writeBrowseFilePathAjax.php accepts arbitrary executable pathnames. The issue exists due to an incomplete fix for CVE-2019-17124. The CVSS score is 9.8, categorized as critical, indicating a severe risk. The affected product is Kramer VIAware, with the vulnerability affecting all versions prior to the vendor's patch released after August 2021.
Technical Analysis
The root cause of CVE-2021-36356 is the failure to properly validate input for the ajaxPages/writeBrowseFilePathAjax.php script, which allows for arbitrary code execution. The attack vector is network-based, and the attack complexity is low, meaning that it can be exploited without sophisticated techniques. No privileges are required for exploitation, and user interaction is also not necessary. The confidentiality, integrity, and availability impacts are all rated as high, making this vulnerability particularly dangerous.
Risk & Impact Analysis
The real-world risk of this vulnerability is significant. Organizations using Kramer VIAware may face extensive damage if attackers exploit this vulnerability to execute arbitrary code. The potential blast radius is substantial, as the vulnerability affects all instances of the product prior to the patch. Organizations should assess their exposure and prioritize remediation based on the critical nature of this exploit.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of Kramer VIAware prior to the vendor's patch released in August 2021 are affected by this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching immediately to mitigate this risk. Upgrading to the latest version of Kramer VIAware is essential. If a patch is unavailable, organizations should apply configuration hardening measures and restrict access to vulnerable components. Additionally, implementing network controls and monitoring for suspicious activities can help reduce exposure to this vulnerability.
Detection Guidance
Monitoring logs for unusual access patterns and tracking behavioral anomalies can help detect potential exploitation attempts. Network signatures associated with unauthorized access should be established, and any unexpected changes to systems should be investigated promptly.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-36356 highlights ongoing challenges in software security, particularly regarding input validation and handling. It represents a trend where incomplete fixes can lead to critical vulnerabilities. Security teams should take this as a lesson to implement rigorous validation processes and ensure that security patches are thoroughly tested. Organizations should consider adopting a comprehensive vulnerability management program to enhance their defenses against such vulnerabilities.
Furthermore, organizations are encouraged to engage in regular penetration testing to assess their security posture continually.
To further bolster security, teams should be aware of potential threats by staying updated on emerging vulnerabilities and threat intelligence reports. Engaging in red teaming exercises can provide insights into adversary techniques and help strengthen defenses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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