CVE-2004-0448 in jftpgw
Summary
by MITRE
format string vulnerability in the log function for jftpgw 0.13.4 and earlier allows remote authenticated users to execute arbitrary code via format string specifiers in certain syslog messages.
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Analysis
by VulDB Data Team • 06/30/2021
The vulnerability identified as CVE-2004-0448 represents a critical format string flaw within the jftpgw software version 0.13.4 and earlier. This issue specifically affects the logging function of the application, which processes syslog messages containing user-provided data without proper sanitization or validation. The flaw occurs when the application receives authenticated connections and processes user input through logging mechanisms that directly incorporate user-supplied strings into format specifiers without appropriate escaping or validation.
The technical nature of this vulnerability aligns with CWE-134, which describes the weakness of using user-controlled format strings in functions like printf, sprintf, or syslog. When an authenticated remote attacker submits specially crafted syslog messages containing format specifiers such as %x, %s, or %n, the vulnerable logging function processes these inputs directly without proper input validation. This allows attackers to manipulate the program's execution flow by reading from or writing to memory locations, potentially leading to arbitrary code execution with the privileges of the jftpgw process.
The operational impact of this vulnerability extends beyond simple code execution, as it enables attackers to exploit the application's logging functionality to gain unauthorized access to system resources. The authenticated nature of the exploit means that an attacker must first establish valid credentials, but once authenticated, they can leverage this vulnerability to escalate privileges and potentially compromise the entire system. This type of vulnerability is particularly dangerous in networked environments where FTP gateways serve as critical access points for file transfers and system communication.
The attack vector for CVE-2004-0448 follows the patterns described in the ATT&CK framework under technique T1059.007 for command and scripting interpreter, specifically targeting the execution of arbitrary code through format string vulnerabilities. The vulnerability demonstrates a classic path to privilege escalation where legitimate application functionality becomes a vector for malicious code injection. Organizations using jftpgw versions prior to 0.13.5 should consider immediate remediation through patching or upgrading to versions that properly sanitize user input in logging functions.
Mitigation strategies for this vulnerability should include immediate patching of the jftpgw application to version 0.13.5 or later, which addresses the format string handling in logging functions. Additionally, network segmentation and access controls should be implemented to limit the exposure of FTP gateway services to authenticated users. The implementation of proper input validation and sanitization practices, particularly in logging functions, should be enforced across all applications processing user-provided data. Organizations should also consider implementing intrusion detection systems to monitor for suspicious syslog message patterns that might indicate exploitation attempts. The vulnerability highlights the importance of proper secure coding practices and the need for regular security assessments of network services to prevent similar issues from occurring in other applications.