CVE-2002-0244 in AtheOS
Summary
by MITRE
Directory traversal vulnerability in chroot function in AtheOS 0.3.7 allows attackers to escape the jail via a .. (dot dot) in the pathname argument to chdir.
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Analysis
by VulDB Data Team • 06/30/2024
The vulnerability described in CVE-2002-0244 represents a critical directory traversal flaw within the chroot functionality of the AtheOS operating system version 0.3.7. This security weakness fundamentally undermines the purpose of chroot jails, which are designed to isolate processes and limit their access to the file system by changing the root directory to a specified location. The flaw specifically affects the chroot implementation where the chdir function fails to properly validate pathname arguments containing directory traversal sequences, allowing malicious actors to navigate outside the intended jail boundaries.
The technical nature of this vulnerability stems from improper input validation within the chroot subsystem where the system does not adequately sanitize pathnames before processing them through the chdir function. When an attacker supplies a pathname argument containing .. (dot dot) sequences, the system fails to properly resolve these references, enabling path traversal that bypasses the intended directory restrictions. This flaw operates at the kernel level within the file system access controls, making it particularly dangerous as it can be exploited to access files and directories outside the chroot environment that should be inaccessible to processes running within it.
The operational impact of this vulnerability is severe and far-reaching for systems utilizing AtheOS 0.3.7 in environments where security isolation is critical. An attacker who successfully exploits this vulnerability can escape the chroot jail and gain access to the broader file system, potentially allowing them to read sensitive configuration files, access other user accounts, or even escalate privileges to root level access. This represents a complete breakdown of the security model that chroot jails are designed to provide, effectively nullifying any sandboxing benefits that administrators might have relied upon for process isolation and system security.
From a cybersecurity perspective, this vulnerability aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, and demonstrates the classic pattern of insufficient input validation leading to privilege escalation through directory traversal attacks. The attack vector follows established patterns documented in MITRE ATT&CK framework under technique T1059 for command and scripting interpreter and T1068 for exploit for privilege escalation. Organizations using AtheOS or similar systems should implement immediate mitigations including patching to newer versions of the operating system, implementing additional access controls, and monitoring for suspicious file system access patterns that might indicate exploitation attempts. The vulnerability highlights the critical importance of proper input validation in security-critical system functions and serves as a reminder of the potential consequences when fundamental security mechanisms fail to properly sanitize user inputs.