CVE-2021-36286 is a high-severity vulnerability affecting Dell SupportAssist Client Consumer versions 3.9.13.0 and earlier. This vulnerability allows non-privileged users to exploit the Windows NTFS feature known as Symbolic links to delete arbitrary files on a system. The risk of file deletion is particularly concerning as it can impact system integrity and availability.
The vulnerability has a CVSS score of 7.1, indicating a high severity level. The combination of low attack complexity and minimal privileges required makes it relatively easy for attackers to exploit this vulnerability. Organizations utilizing affected versions of Dell SupportAssist should prioritize remediation to minimize potential risks.
Immediate patching is crucial to mitigate the risk associated with this vulnerability. The exploitation of this flaw could allow attackers to delete important files, which may lead to unauthorized data access or system instability.
Organizations should ensure they are using the latest version of the Dell SupportAssist Client to avoid the potential repercussions of this vulnerability.
Vulnerability Details
Dell SupportAssist Client Consumer versions 3.9.13.0 and prior contain an arbitrary file deletion vulnerability. This occurs due to the application’s inability to distinguish between NTFS junction points and physical folders. When non-privileged users create junction points, the SupportAssist clean files functionality can inadvertently delete files that should only be accessible to administrators.
The vulnerability is classified under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory) and CWE-59 (Improper Link Resolution in a Symbolic Link).
The vulnerability was published on September 28, 2021, and it is classified as high severity with a CVSS score of 7.1. The attack vector is local, with low complexity and low privileges required, meaning that an attacker does not need high-level access to exploit this vulnerability.
Technical Analysis
The root cause of CVE-2021-36286 lies in the improper handling of NTFS symbolic links by the SupportAssist application. Attackers may leverage this flaw by creating symbolic links to junction points, which the application does not differentiate from actual directories. As a result, when the clean files function is executed, it unintentionally deletes files that should remain untouched.
The attack vector for this vulnerability is local, meaning the attacker must have physical or remote access to the affected system. The attack complexity is low, requiring minimal effort to exploit the vulnerability. Only low privileges are necessary, as the attack can be initiated by any non-privileged user. There is no user interaction required, making it easier for attackers to execute their malicious actions.
The vulnerability has significant impacts on integrity and availability, as it allows unauthorized deletion of important files, which can disrupt normal operations and lead to data loss or corruption.
Risk & Impact Analysis
The exploitation of CVE-2021-36286 poses a considerable risk to organizations using the affected Dell SupportAssist Client versions. The ability for non-privileged users to delete arbitrary files can have a severe impact on operational integrity and data security.
Organizations should assess their deployment of Dell SupportAssist and the potential blast radius of this vulnerability. With a CVSS score of 7.1, immediate action is recommended to patch or upgrade vulnerable systems to prevent unauthorized file deletions.
Given the high-impact nature of this vulnerability, organizations should prioritize it within their patch management processes to ensure robust defenses against potential exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected versions include Dell SupportAssist Client Consumer versions 3.9.13.0 and any prior versions. Organizations should ensure they are using versions that are patched against this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching Dell SupportAssist Client to version 3.9.13.1 or later to mitigate this vulnerability. If a patch is not immediately available, consider implementing workarounds that restrict the ability of non-privileged users to create symbolic links.
For further guidance on securing systems, organizations may refer to the penetration testing services offered by AppSecure.
Detection Guidance
Monitor logs for indicators of unauthorized file deletions and unusual behaviors related to file access. Additionally, system changes involving the creation of junction points should be logged and reviewed.
AppSecure Threat Intelligence Insight
CVE-2021-36286 highlights the risks associated with improper handling of symbolic links in applications. Security teams should be aware of the potential for similar vulnerabilities in other software.
To enhance overall security posture, organizations should consider implementing regular security assessments and audits. For in-depth strategies, organizations can explore the penetration testing methodology as a proactive measure.
Finally, organizations should review their incident response plans to ensure they are prepared for potential exploitation of vulnerabilities like CVE-2021-36286. For organizations interested in improving their security frameworks, the vulnerability management program can offer valuable insights.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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