CVE-2001-1272 in Wmtv
Summary
by MITRE
wmtv 0.6.5 and earlier does not properly drop privileges, which allows local users to execute arbitrary commands via the -e (external command) option.
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Analysis
by VulDB Data Team • 04/30/2019
The vulnerability identified as CVE-2001-1272 affects the wmtv media player version 0.6.5 and earlier, presenting a critical privilege escalation risk that stems from improper privilege handling during program execution. This flaw exists within the software's design where the application fails to correctly drop elevated privileges after initialization, creating a persistent security weakness that local attackers can exploit to execute arbitrary commands with higher privileges than intended. The vulnerability specifically manifests through the -e (external command) option, which provides a direct pathway for privilege escalation when the application is run with elevated permissions such as root or administrator rights. When wmtv executes with elevated privileges and processes the external command option, it does not properly transition to a lower privilege level, leaving the process running with elevated access. This behavior creates a dangerous condition where any local user with access to the system can leverage this flaw to execute malicious commands with the privileges of the running wmtv process, potentially allowing full system compromise. The underlying technical flaw represents a classic privilege escalation vulnerability that violates fundamental security principles of least privilege and proper privilege management. According to CWE-276, this vulnerability maps directly to improper privilege management, where the application fails to properly handle privilege levels during execution. The vulnerability also aligns with ATT&CK technique T1068, which describes the use of privilege escalation techniques through improper privilege handling in software applications. The operational impact of this vulnerability extends beyond simple command execution, as it provides attackers with a persistent backdoor mechanism that can be used to maintain access, escalate privileges further, or establish persistent presence on the compromised system. Local users who can execute commands through the -e option gain the ability to perform actions that would normally be restricted to system administrators, including modifying system files, installing malware, or accessing sensitive data. The vulnerability affects systems where wmtv is installed with setuid permissions, which is a common practice for multimedia applications that require access to hardware resources. When such applications are installed with elevated privileges, the improper privilege dropping behavior becomes particularly dangerous, as it essentially provides a direct path to system compromise for any local user who can interact with the application. The exploitation process requires minimal technical skill, making it particularly dangerous as it can be leveraged by attackers with basic system access. The vulnerability demonstrates a critical failure in the application's security architecture, where proper privilege separation is not implemented during the application lifecycle. This flaw represents a fundamental design issue in the software's security model, where the developers failed to implement proper privilege management protocols. The security implications are severe as this vulnerability can be exploited to gain unauthorized access to system resources and potentially escalate privileges to root or administrator levels, depending on how the application is installed and configured. The vulnerability also highlights the importance of proper privilege separation in multimedia applications, which often require access to hardware resources but should not maintain elevated privileges beyond what is necessary for their operation. This particular vulnerability serves as a prime example of why applications should implement proper privilege dropping mechanisms, particularly those that handle user input or external commands. The flaw underscores the necessity of following security best practices such as the principle of least privilege, where applications should operate with the minimum necessary permissions to perform their functions. Organizations should implement immediate mitigations including updating to patched versions of wmtv, removing setuid permissions from vulnerable installations, or ensuring that the application does not run with elevated privileges. Additionally, system administrators should conduct comprehensive audits to identify all instances of vulnerable software installations and ensure that proper privilege management is enforced across all system components. The vulnerability also emphasizes the importance of regular security assessments and vulnerability scanning to identify similar privilege escalation flaws in other applications that may not have been properly addressed. Proper input validation and privilege management should be implemented as core security features in all software development processes to prevent similar vulnerabilities from being introduced in future releases.