CVE-2007-0366 in Rumpus FTP Server
Summary
by MITRE
Untrusted search path vulnerability in Rumpus 5.1 and earlier allows local users to gain privileges via a modified PATH that points to a malicious ipfw program.
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Analysis
by VulDB Data Team • 10/07/2017
The vulnerability described in CVE-2007-0366 represents a classic untrusted search path issue affecting Rumpus 5.1 and earlier versions. This type of vulnerability falls under the CWE-426 category, which specifically addresses the execution of untrusted code due to insecure search path handling. The flaw manifests when the Rumpus file sharing application fails to properly validate or sanitize the PATH environment variable during program execution, creating an opportunity for local attackers to manipulate the system's program resolution process. The vulnerability is particularly concerning because it enables privilege escalation through a carefully crafted malicious program that exploits the insecure PATH handling mechanism.
The technical exploitation of this vulnerability relies on the attacker's ability to modify the system PATH variable to include directories containing malicious executables. In this specific case, the attacker creates a modified PATH that points to a malicious ipfw program, which is a network filtering utility commonly used on unix-based systems. When Rumpus executes commands that rely on system utilities, it resolves these commands through the modified PATH, inadvertently executing the malicious ipfw program instead of the legitimate system utility. This occurs because the application does not explicitly specify absolute paths for system utilities or properly validate the search path before execution, allowing the attacker to inject malicious code into the execution flow.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with a persistent mechanism for gaining elevated system access. The attack vector is particularly dangerous because it requires minimal privileges to execute and can be leveraged to establish a foothold that persists across system reboots. The vulnerability affects systems running Rumpus 5.1 and earlier versions, which were commonly used file sharing servers in enterprise environments, making this a significant concern for organizations with legacy systems. The malicious program can be designed to perform various malicious activities including data exfiltration, system reconnaissance, or establishing backdoors that maintain persistence.
Mitigation strategies for this vulnerability must address the fundamental flaw in how the application handles system paths. The most effective approach involves implementing proper PATH validation and explicit absolute path specification for all system utilities. Organizations should ensure that Rumpus is updated to versions that properly handle PATH variables and do not rely on potentially compromised search paths. System administrators should also implement privilege separation techniques and regularly audit system PATH configurations to prevent unauthorized modifications. Additionally, this vulnerability aligns with ATT&CK technique T1068 which covers privilege escalation through local exploits, and T1546 which covers path hijacking and DLL side-loading attacks. The mitigation efforts should include regular security assessments of legacy applications and implementation of automated monitoring for PATH modifications that could indicate exploitation attempts.