CVE-2003-0074 in plptools
Summary
by MITRE
Format string vulnerability in mpmain.c for plpnfsd of the plptools package allows remote attackers to execute arbitrary code via the functions (1) debuglog, (2) errorlog, and (3) infolog.
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Analysis
by VulDB Data Team • 10/28/2024
The vulnerability identified as CVE-2003-0074 represents a critical format string flaw within the plptools package's plpnfsd daemon, specifically in the mpmain.c source file. This vulnerability manifests in three distinct logging functions: debuglog, errorlog, and infolog, which are all susceptible to malicious input manipulation. The flaw stems from improper handling of user-supplied data within printf-style function calls, creating an exploitable condition where remote attackers can inject malicious format specifiers into the logging mechanisms.
This format string vulnerability falls under the CWE-134 classification, which specifically addresses the use of untrusted input in format string functions. The issue occurs when the plpnfsd daemon processes incoming data through these logging functions without proper sanitization of format specifiers. Attackers can craft malicious input that contains format specifiers such as %x, %s, or %n, which when processed by the vulnerable printf calls can lead to memory corruption, information disclosure, or arbitrary code execution. The remote nature of this attack vector means that adversaries can exploit the vulnerability from outside the local network without requiring authentication or local access privileges.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with potential access to sensitive system information through information disclosure mechanisms. When the logging functions process malicious input, the format string exploit can read arbitrary memory locations, potentially exposing sensitive data such as stack contents, environment variables, or other system information. This information disclosure can be leveraged to further compromise the system or aid in additional attacks. The vulnerability affects the plpnfsd daemon, which is part of the plptools package designed for network file system operations, making it particularly dangerous in networked environments where NFS services are exposed to untrusted networks.
The exploitation of this vulnerability requires a sophisticated understanding of memory layout and format string mechanics, aligning with ATT&CK technique T1059.007 for command and scripting interpreter. The attack typically involves crafting specific payload data that when processed by the vulnerable logging functions, can trigger memory corruption through the %n format specifier or other malicious combinations. Organizations using plptools or plpnfsd services are particularly at risk since these services often run with elevated privileges, potentially allowing successful exploitation to result in full system compromise. The vulnerability demonstrates the importance of input validation and proper sanitization of user-supplied data in network services, as outlined in the OWASP Top Ten security principles and the SANS Institute's secure coding guidelines.
Mitigation strategies for CVE-2003-0074 should focus on immediate patching of the plptools package to address the format string vulnerabilities in the affected logging functions. Organizations should also implement network segmentation to limit access to NFS services, disable unnecessary services, and apply proper input validation measures to prevent format string exploitation. The implementation of address space layout randomization (ASLR) and stack canaries can provide additional defense-in-depth measures against exploitation attempts. Regular security auditing of network services and maintaining updated vulnerability databases are essential practices to identify and remediate similar vulnerabilities in other software components. Additionally, monitoring for unusual logging activity or network traffic patterns can help detect potential exploitation attempts before they result in successful compromise of the affected systems.