CVE-2001-0181 in Openlinux
Summary
by MITRE
Format string vulnerability in the error logging code of DHCP server and client in Caldera Linux allows remote attackers to execute arbitrary commands.
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Analysis
by VulDB Data Team • 05/29/2018
This vulnerability exists in the error logging functionality of DHCP servers and clients running on Caldera Linux systems, representing a classic format string vulnerability that can be exploited remotely to execute arbitrary code. The flaw occurs when the system processes user-supplied input without proper validation or sanitization, allowing attackers to inject format specifiers that can manipulate the program's execution flow. This type of vulnerability falls under CWE-134 which specifically addresses the use of format strings with user-supplied data, making it a direct security risk when applications fail to properly handle dynamic format strings.
The technical implementation of this vulnerability allows remote attackers to craft malicious DHCP packets or error messages that contain format specifiers such as %x, %s, or %n which can be interpreted by the vulnerable logging code. When the DHCP server or client processes these malformed error messages, the format string vulnerability can be exploited to read from or write to arbitrary memory locations, potentially leading to stack corruption and arbitrary code execution. The vulnerability is particularly dangerous because it can be triggered without authentication, making it an ideal candidate for remote exploitation in networked environments where DHCP services are actively utilized.
The operational impact of this vulnerability extends beyond simple command execution, as it can enable attackers to gain full control over affected systems, potentially leading to complete compromise of network infrastructure. In enterprise environments where DHCP is a critical component of network operations, this vulnerability could allow attackers to disrupt services, gain unauthorized access to sensitive data, or establish persistent backdoors within the network. The vulnerability affects both DHCP server implementations and client applications, meaning that attackers could potentially exploit it in either direction of communication, making it a comprehensive threat to network security. This aligns with ATT&CK technique T1059 which covers command and scripting interpreter, as successful exploitation would enable attackers to execute arbitrary commands on compromised systems.
Mitigation strategies should focus on immediate patching of affected Caldera Linux systems, implementing proper input validation and sanitization in all logging functions, and applying network segmentation to limit exposure of DHCP services to untrusted networks. Organizations should also consider implementing network monitoring to detect suspicious DHCP traffic patterns and ensure that all system components are regularly updated to address known vulnerabilities. Additionally, the implementation of proper access controls and network firewalls can help reduce the attack surface by limiting which systems can communicate with DHCP services, thereby reducing the likelihood of exploitation. The vulnerability demonstrates the critical importance of secure coding practices and proper validation of user inputs in network services, particularly those handling dynamic data from external sources.