CVE-2000-1144 in ManTrap
Summary
by MITRE
Recourse ManTrap 1.6 sets up a chroot environment to hide the fact that it is running, but the inode number for the resulting "/" file system is higher than normal, which allows attackers to determine that they are in a chroot environment.
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Analysis
by VulDB Data Team • 01/25/2025
The vulnerability described in CVE-2000-1144 affects Recourse ManTrap 1.6, a security monitoring tool designed to detect and prevent unauthorized access to systems. This tool implements a chroot environment as part of its operational framework to conceal its presence and activities from potential attackers. The chroot mechanism is a standard Unix/Linux security feature that changes the root directory for a process and its children, effectively creating a sandboxed environment that limits the tool's visibility to the broader system. However, the implementation in this specific version contains a critical flaw that undermines its intended security objectives.
The technical flaw lies in the inode number calculation within the chrooted environment. When a process executes chroot, the filesystem structure changes, but certain metadata elements such as inode numbers may not be properly adjusted to reflect the new environment. In this case, the root filesystem within the chroot environment maintains an inode number that is higher than what would typically be expected in a standard system environment. This discrepancy creates a detectable artifact that sophisticated attackers can leverage to identify the presence of a chrooted process. The vulnerability represents a failure in proper environment isolation and demonstrates a lack of thorough security testing for edge cases in chroot implementation.
The operational impact of this vulnerability is significant as it defeats the fundamental purpose of using chroot for security purposes. Attackers who can detect the chroot environment can then employ additional techniques to bypass the security monitoring capabilities of ManTrap 1.6. This detection capability allows malicious actors to determine that they are being monitored or that their activities are being observed in a confined environment, potentially leading to more aggressive attack vectors or attempts to exploit other system weaknesses. The vulnerability essentially provides an information leak that compromises the tool's ability to maintain operational stealth and security effectiveness.
This vulnerability aligns with CWE-272, which addresses "Least Privilege" issues in security contexts, and relates to the broader category of environment manipulation attacks that fall under ATT&CK technique T1059.001 for command and scripting interpreter. The flaw demonstrates how improper implementation of system security mechanisms can create unintended information disclosure channels. Security practitioners should consider this vulnerability when evaluating legacy security tools and understand that even seemingly simple security measures like chroot can have subtle implementation flaws. The recommended mitigation involves updating to a version that properly handles inode number calculations within chroot environments or implementing additional detection mechanisms to prevent such information leaks. Organizations should also perform comprehensive security testing of all system isolation mechanisms to ensure that they do not introduce detectable artifacts that could compromise their intended security posture.