CVE-2005-0071 in vdr
Summary
by MITRE
vdr before 1.2.6 does not securely create files, which allows attackers to overwrite arbitrary files.
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Analysis
by VulDB Data Team • 05/29/2019
The vulnerability identified as CVE-2005-0071 affects the Video Disk Recorder (VDR) software version 1.2.5 and earlier, presenting a critical security flaw in file creation processes that can be exploited to overwrite arbitrary files on the system. This vulnerability stems from improper handling of temporary file creation mechanisms within the VDR application, which operates as a digital video recorder for linux systems. The flaw specifically manifests when the software creates temporary files during its operation, particularly during recording and playback functions, where it fails to implement secure file creation practices that would prevent malicious interference.
The technical implementation of this vulnerability involves the use of insecure temporary file creation methods that do not properly validate or secure the file paths and permissions during the creation process. Attackers can exploit this weakness by creating symbolic links or manipulating the file system in such a way that when VDR attempts to create its temporary files, it inadvertently overwrites files of the attacker's choosing. This represents a classic insecure temporary file handling vulnerability that can be categorized under CWE-377, which specifically addresses insecure temporary file creation practices. The vulnerability allows for privilege escalation and arbitrary file overwrite operations that can potentially lead to complete system compromise depending on the privileges under which VDR operates.
The operational impact of this vulnerability extends beyond simple file corruption, as it can be leveraged to execute various malicious activities within the targeted system. An attacker with access to the system where VDR is running can exploit this vulnerability to overwrite critical system files, configuration files, or even executable programs, potentially leading to denial of service, privilege escalation, or complete system compromise. This vulnerability particularly affects systems where VDR is running with elevated privileges, as the file overwrite operations can target system-critical components. The attack vector requires local access to the system, making it a privilege escalation vulnerability that can be particularly dangerous in multi-user environments where VDR might be running with root privileges.
Security professionals should implement immediate mitigations including updating to VDR version 1.2.6 or later, which contains the necessary fixes for secure temporary file handling. The fix typically involves implementing proper file creation mechanisms that use secure temporary file functions and validate file paths before creation. Additionally, system administrators should consider restricting VDR's privileges where possible and implementing proper file system permissions and access controls. This vulnerability aligns with ATT&CK technique T1059, which covers command and script injection, and T1548.001, which addresses abuse of sudo privileges, as attackers can potentially leverage this vulnerability to escalate their privileges and gain unauthorized access to system resources. Organizations should also implement monitoring for unusual file creation patterns and ensure proper patch management processes are in place to address similar vulnerabilities in other software components.