CVE-2021-25271 in HitmanPro
Summary
by MITRE • 10/08/2021
A local attacker could read or write arbitrary files with administrator privileges in HitmanPro before version Build 318.
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Analysis
by VulDB Data Team • 10/14/2021
The vulnerability identified as CVE-2021-25271 represents a critical local privilege escalation flaw in HitmanPro software prior to Build 318. This vulnerability stems from insufficient access controls and improper privilege management within the application's file system operations. The flaw allows a local attacker with minimal privileges to escalate their access level and gain administrative capabilities, enabling them to perform arbitrary read and write operations on system files and directories. The vulnerability exists due to the application's failure to properly validate file access requests and maintain appropriate security boundaries between different user contexts. Attackers can exploit this weakness to manipulate system files, install malicious software, or exfiltrate sensitive data from protected locations. The impact is particularly severe because HitmanPro is designed as an anti-malware tool that typically runs with elevated privileges to perform system scans and remediation tasks, making it an attractive target for attackers seeking to establish persistent access or escalate their privileges within the system environment.
The technical implementation of this vulnerability involves improper handling of file system operations within the HitmanPro application. The flaw manifests when the software processes file access requests without adequate validation of the requesting user's privileges or the target file's security attributes. This allows an attacker to manipulate the application's file handling routines to access files that should normally be restricted to administrator-level access. The vulnerability can be exploited through various attack vectors including direct file system manipulation, process injection techniques, or by leveraging the application's legitimate administrative functions to perform unauthorized operations. The root cause aligns with CWE-276, which addresses improper file permissions and inadequate access control mechanisms. The attack surface is further expanded by the fact that HitmanPro's legitimate administrative functions can be abused to bypass normal security checks, creating a path for privilege escalation that operates outside of normal system security boundaries.
From an operational perspective, this vulnerability presents a significant risk to enterprise environments where HitmanPro is deployed for endpoint protection. The local attacker can leverage this weakness to establish persistent backdoors, modify system configurations, or access sensitive corporate data that would normally be protected from standard user accounts. The exploitation requires only local system access, making it particularly dangerous in environments where physical security is compromised or where attackers have gained initial access through other means. The vulnerability affects the integrity and confidentiality of the entire system since it allows for arbitrary file manipulation with the highest available privileges. Organizations using HitmanPro versions prior to Build 318 face potential data breaches, system compromise, and complete loss of control over protected resources. The attack can be executed silently without generating obvious alerts, making detection particularly challenging for security monitoring systems that may not recognize the legitimate application behavior as malicious.
The recommended mitigations for CVE-2021-25271 involve immediate deployment of the patched version Build 318 or later, which addresses the underlying privilege escalation and file access control issues. Organizations should also implement additional security measures including regular vulnerability assessments, monitoring for unusual file system activity, and ensuring proper access controls are enforced through system hardening procedures. The fix should include enhanced input validation, proper privilege separation, and implementation of secure file access routines that prevent unauthorized operations. Security teams should conduct comprehensive audits of HitmanPro installations to verify that all systems have been updated and that no vulnerable versions remain in production. Network segmentation and monitoring solutions should be enhanced to detect potential exploitation attempts, and system administrators should be trained to recognize signs of privilege escalation attacks. This vulnerability demonstrates the importance of maintaining up-to-date security software and the potential risks associated with applications that operate with elevated privileges, as highlighted by ATT&CK technique T1068 which covers privilege escalation through local exploits. Organizations should also consider implementing application whitelisting policies to restrict execution of unauthorized software and reduce the attack surface available to potential exploiters.