CVE-2014-9633 in Backup
Summary
by MITRE
The bdisk.sys driver in COMODO Backup before 4.4.1.23 allows remote attackers to gain privileges via a crafted device handle, which triggers a NULL pointer dereference.
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Analysis
by VulDB Data Team • 07/28/2025
The vulnerability identified as CVE-2014-9633 resides within the bdisk.sys kernel driver component of COMODO Backup software versions prior to 4.4.1.23. This driver operates at the kernel level and handles device operations for backup functionalities, making it a critical component in the system's security architecture. The flaw manifests as a NULL pointer dereference condition that can be exploited by remote attackers to escalate privileges, representing a significant security risk that undermines the integrity of the affected system.
The technical exploitation of this vulnerability occurs through a crafted device handle that is processed by the bdisk.sys driver. When the driver receives this malicious input, it fails to properly validate the pointer reference before attempting to dereference it, leading to a system crash or potential privilege escalation. This NULL pointer dereference represents a classic software flaw categorized under CWE-476, which specifically addresses NULL pointer dereference conditions that can lead to denial of service or more severe security implications. The vulnerability's remote exploitation capability means that attackers do not require physical access to the system, significantly expanding the attack surface and potential impact.
The operational impact of this vulnerability extends beyond simple system instability, as successful exploitation can result in full system compromise and privilege escalation to kernel-level access. Attackers who successfully leverage this vulnerability can execute arbitrary code with the highest system privileges, potentially leading to complete system takeover, data exfiltration, or establishment of persistent backdoors. The nature of kernel-level vulnerabilities makes them particularly dangerous because they operate below the normal security boundaries of the operating system, allowing attackers to bypass standard user-mode protections and access system resources directly.
Mitigation strategies for CVE-2014-9633 primarily focus on updating to the patched version of COMODO Backup software, specifically version 4.4.1.23 or later, which addresses the NULL pointer dereference issue through proper input validation and pointer handling. System administrators should also implement network segmentation and access controls to limit exposure to the vulnerable software, while monitoring for suspicious device handle operations that might indicate exploitation attempts. From an ATT&CK framework perspective, this vulnerability aligns with techniques involving privilege escalation and kernel-mode exploitation, specifically mapping to tactics such as privilege escalation and defense evasion. Organizations should also consider implementing endpoint detection and response solutions that can monitor for anomalous driver behavior and suspicious privilege escalation events that might indicate exploitation of similar kernel-level vulnerabilities.