CVE-2000-0721 in FlagShip
Summary
by MITRE
The FSserial, FlagShip_c, and FlagShip_p programs in the FlagShip package are installed world-writeable, which allows local users to replace them with Trojan horses.
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Analysis
by VulDB Data Team • 12/01/2024
The vulnerability described in CVE-2000-0721 represents a critical privilege escalation flaw within the FlagShip software package that was prevalent in unix-like operating systems during the late 1990s and early 2000s. This issue stems from improper file permissions that were assigned to three specific executable programs within the FlagShip suite, namely FSserial, FlagShip_c, and FlagShip_p. These programs were configured with world-writable permissions, meaning any local user on the system could modify or replace these binaries with malicious alternatives. The vulnerability directly violates fundamental security principles of least privilege and proper access control implementation, creating a pathway for unauthorized code execution with elevated system privileges.
The technical exploitation of this vulnerability relies on the principle of executable file replacement within a system's file permissions model. When programs are installed with world-writeable permissions, they become susceptible to modification by any user account, regardless of their privilege level or intended function. This particular flaw falls under the CWE-73 Improper Neutralization of Special Elements in a Command context, as it involves the improper handling of file system permissions that could lead to command injection through replacement binaries. The vulnerability exists at the operating system level where file permission models fail to properly restrict write access to critical system executables, allowing local users to gain unauthorized modification capabilities. The specific programs affected are part of a larger software suite designed for document management and processing, making their compromise particularly dangerous as they could be leveraged to execute arbitrary code with the privileges of the processes they run under.
The operational impact of CVE-2000-0721 extends beyond simple privilege escalation to encompass potential system compromise and data integrity violations. Local users who exploit this vulnerability can effectively subvert the intended functionality of the FlagShip package by replacing legitimate executables with Trojan horses that contain malicious code. This approach to exploitation aligns with the attack pattern documented in the MITRE ATT&CK framework under T1059 Command and Scripting Interpreter and T1068 Local Privilege Escalation techniques. Once a malicious binary replaces the legitimate one, any invocation of the replaced program will execute the attacker's code, potentially allowing for persistent access, data exfiltration, or further system compromise. The vulnerability's impact is particularly severe because it operates at the local user level without requiring network access or specialized attack vectors, making it easily exploitable in environments where multiple users have local access to systems.
Mitigation strategies for CVE-2000-0721 must focus on immediate permission correction and long-term system hardening measures. The primary remediation involves changing the file permissions of the affected executables to prevent world-writeable access, typically through chmod operations that restrict write permissions to the owning user and group only. System administrators should also implement proper file integrity monitoring to detect unauthorized modifications to critical system executables, aligning with security best practices outlined in NIST SP 800-53 and ISO 27001 standards. Additional measures include regular security audits of file permissions, implementation of automated patch management systems, and enforcement of principle of least privilege across all system components. Organizations should also consider implementing mandatory access controls and file system monitoring solutions to detect and prevent similar vulnerabilities in other software packages. The remediation process must be comprehensive, addressing not only the immediate vulnerability but also establishing preventive measures to avoid similar permission-related security flaws in future software deployments.