CVE-2000-0018 in FreeBSD
Summary
by MITRE
wmmon in FreeBSD allows local users to gain privileges via the .wmmonrc configuration file.
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Analysis
by VulDB Data Team • 09/13/2024
The vulnerability identified as CVE-2000-0018 resides within the wmmon utility of FreeBSD operating systems, representing a local privilege escalation flaw that has significant implications for system security. This issue specifically targets the wmmon monitoring tool which is part of the WindowMaker desktop environment, allowing attackers with local access to elevate their privileges through manipulation of the .wmmonrc configuration file. The vulnerability stems from improper handling of configuration file permissions and execution contexts, creating a path for unauthorized privilege elevation that directly violates fundamental security principles of least privilege and access control.
The technical flaw manifests through the insecure processing of the .wmmonrc file, which is typically located in the user's home directory and contains configuration settings for the wmmon monitoring utility. When wmmon executes with elevated privileges or when the configuration file is processed in a context that allows privilege escalation, local users can craft malicious entries within this file that trigger unintended behavior during program execution. This type of vulnerability aligns with CWE-276, which describes improper file permissions, and represents a classic case of insecure configuration file handling that can be exploited through privilege escalation techniques. The flaw essentially creates a scenario where a local user can manipulate program execution flow through configuration file manipulation, bypassing normal access controls and privilege boundaries.
The operational impact of this vulnerability extends beyond simple local privilege escalation, as it provides attackers with a reliable method to gain elevated system access without requiring network connectivity or complex exploitation techniques. Once exploited, the vulnerability allows local users to execute commands with higher privileges, potentially enabling them to modify system files, install malicious software, or access sensitive data that would otherwise be restricted. This represents a significant security risk in multi-user environments where local access might be granted to untrusted users, as it directly undermines the principle of separation of privileges and can lead to complete system compromise. The attack vector is particularly concerning because it requires minimal prerequisites and can be executed by any local user with write access to their home directory.
Mitigation strategies for this vulnerability must address both the immediate configuration file handling issues and broader system security practices. The primary remediation involves ensuring proper file permissions on the .wmmonrc configuration file and implementing secure file handling procedures within the wmmon utility itself. System administrators should verify that configuration files are not writable by untrusted users and that the program does not execute with unnecessary elevated privileges. Additionally, this vulnerability highlights the importance of following secure coding practices and implementing proper input validation for configuration files as outlined in various security frameworks. The fix typically requires updating the wmmon utility to properly validate and sanitize configuration file contents, implement stricter file permission checks, and avoid executing configuration file contents with elevated privileges. This vulnerability also underscores the need for comprehensive security auditing of desktop environment components and proper privilege management in system utilities, aligning with defensive techniques described in the MITRE ATT&CK framework under privilege escalation tactics and techniques.