CVE-2005-2807 in frox
Summary
by MITRE
frox 0.7.18 when running setuid root does not properly drop privileges when reading a configuration file which allows local users to read portions of arbitrary files via the -f command line option.
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Analysis
by VulDB Data Team • 12/28/2024
The vulnerability identified as CVE-2005-2807 affects frox version 0.7.18, a proxy server application that operates with elevated privileges through setuid root execution. This security flaw represents a classic privilege escalation issue where the application fails to properly relinquish root privileges after processing user-supplied input. The vulnerability manifests when frox is invoked with the -f command line option, which allows local attackers to manipulate the configuration file reading process. The flaw stems from inadequate privilege management during file operations, creating a path for unauthorized information disclosure.
The technical implementation of this vulnerability involves the frox application maintaining root privileges while processing configuration files through the -f option. When a local user provides a specially crafted configuration file or manipulates file paths, the application reads portions of arbitrary files without properly dropping its elevated privileges. This behavior creates a direct information disclosure vector where attackers can access sensitive system files that would normally be restricted to root access. The vulnerability specifically affects the privilege dropping mechanism within the application's file handling code, allowing local users to bypass normal access controls.
From an operational perspective, this vulnerability poses significant risk to systems running frox 0.7.18 with setuid root permissions. Local attackers can exploit this flaw to read sensitive files such as password databases, configuration files containing credentials, or system logs that contain confidential information. The impact extends beyond simple file reading, as the vulnerability demonstrates poor privilege management practices that could potentially be leveraged for further exploitation. The attack requires local system access but does not require network connectivity, making it particularly dangerous in environments where local privilege escalation is already possible.
The vulnerability aligns with CWE-276, which describes improper privilege management, and represents a specific instance of privilege escalation through improper file access handling. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques where adversaries leverage applications with elevated privileges to access restricted resources. The flaw also relates to credential access and defense evasion categories, as it can be used to extract sensitive information without detection. Organizations should implement immediate mitigations including updating to patched versions of frox, removing setuid permissions from the application, or implementing additional access controls to prevent unauthorized file access.
Mitigation strategies should prioritize immediate patching of frox to versions that properly implement privilege dropping mechanisms. System administrators should also consider removing the setuid bit from frox installations unless absolutely necessary for functionality, as this eliminates the privilege escalation vector entirely. Additional protective measures include implementing proper file access controls, monitoring for unusual file access patterns, and conducting regular privilege auditing to ensure applications do not maintain unnecessary elevated permissions. The vulnerability highlights the critical importance of proper privilege management in setuid applications and demonstrates how seemingly minor implementation flaws can create significant security risks in Unix-like systems.