CVE-2004-1701 in Cfengine
Summary
by MITRE
Heap-based buffer overflow in the AuthenticationDialogue function in cfservd for Cfengine 2.0.0 to 2.1.7p1 allows remote attackers to execute arbitrary code via a long SAUTH command during RSA authentication.
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Analysis
by VulDB Data Team • 11/18/2024
The vulnerability identified as CVE-2004-1701 represents a critical heap-based buffer overflow in the authentication dialogue component of Cfengine versions 2.0.0 through 2.1.7p1. This flaw exists within the cfservd daemon's AuthenticationDialogue function, which handles RSA authentication processes. The vulnerability arises when the system processes a specially crafted SAUTH command containing excessive data, leading to memory corruption that can be exploited by remote attackers to execute arbitrary code on the affected system. This represents a significant security weakness that directly impacts the integrity and confidentiality of networked systems relying on Cfengine for configuration management.
The technical implementation of this vulnerability stems from inadequate input validation within the AuthenticationDialogue function, which fails to properly bounds-check the length of authentication data received during the RSA authentication handshake process. When a malicious actor sends a SAUTH command with data exceeding the allocated buffer size, the excess data overflows into adjacent memory regions, potentially overwriting critical program structures including return addresses and function pointers. This heap-based overflow creates opportunities for attackers to manipulate the program execution flow and inject malicious code, making it particularly dangerous in networked environments where remote code execution can lead to complete system compromise. The vulnerability aligns with CWE-121, heap-based buffer overflow, and represents a classic example of improper input validation leading to memory corruption.
The operational impact of CVE-2004-1701 extends beyond simple privilege escalation to encompass complete system compromise and potential lateral movement within networked environments. Attackers exploiting this vulnerability can gain unauthorized access to systems running vulnerable versions of Cfengine, potentially enabling them to modify configuration files, establish persistent backdoors, or use compromised systems as launching points for further attacks against network infrastructure. The remote nature of this exploit means that attackers do not require physical access or local credentials to leverage the vulnerability, making it particularly attractive for automated attack campaigns. Organizations using Cfengine for configuration management face significant risk exposure, as this vulnerability directly undermines the security assumptions of the system's authentication mechanisms.
Mitigation strategies for CVE-2004-1701 require immediate action to upgrade to patched versions of Cfengine, specifically versions 2.1.8 or later where the buffer overflow has been addressed through proper input validation and bounds checking. System administrators should implement network segmentation and access controls to limit exposure of vulnerable systems to untrusted networks while monitoring for suspicious authentication attempts. Additionally, the implementation of intrusion detection systems capable of identifying malformed SAUTH commands can provide early warning of exploitation attempts. Security teams should also consider implementing network-based firewalls to restrict access to the cfservd daemon's listening ports and establish strict authentication policies that limit the attack surface. The vulnerability demonstrates the importance of regular security updates and proper input validation practices in preventing remote code execution exploits, aligning with ATT&CK technique T1190 for exploitation of remote services and T1068 for local privilege escalation through memory corruption vulnerabilities.