CVE-2005-4082 in qnx
Summary
by MITRE
the dhcp.client program for qnx 4.25 vmware is setuid possibly by default which allows local users to modify the nic configuration and conduct other attacks.
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Analysis
by VulDB Data Team • 07/14/2018
The vulnerability identified as CVE-2005-4082 represents a critical privilege escalation issue within the QNX 4.25 VMware virtual machine environment. This flaw specifically affects the dhcp.client program which is configured with setuid permissions by default, creating a significant security risk for local users who can exploit this misconfiguration to gain elevated system privileges. The dhcp.client program serves as a network configuration utility responsible for managing network interface card settings through dynamic host configuration protocol operations, making it a critical component in system network management.
The technical implementation of this vulnerability stems from the improper privilege management within the QNX operating system's network configuration utilities. When the dhcp.client program executes with elevated privileges due to its setuid bit being enabled, it creates an attack surface where local users can manipulate the network interface configuration parameters. This misconfiguration allows attackers to modify network interface card settings, potentially redirecting network traffic, disabling security features, or establishing persistent access points. The vulnerability operates under CWE-276 which specifically addresses improper file permissions and improper privileges, where the system fails to properly restrict access to privileged operations.
From an operational impact perspective, this vulnerability enables local users to conduct various malicious activities including network sniffing, man-in-the-middle attacks, and unauthorized network access. The ability to modify NIC configuration parameters means attackers can change IP addresses, gateway settings, or DNS configurations to redirect traffic through malicious servers. This represents a significant threat to network integrity and can be leveraged for lateral movement within network environments, particularly in virtualized environments where multiple VMs share underlying network infrastructure. The attack vector is particularly concerning in VMware virtual machine environments where isolation between VMs can be compromised through such privilege escalation techniques.
The exploitation of this vulnerability aligns with several tactics described in the MITRE ATT&CK framework, specifically targeting privilege escalation techniques and persistence mechanisms. Attackers can utilize this flaw to establish long-term access to network resources while maintaining elevated privileges. The vulnerability also relates to defense evasion techniques where attackers can manipulate network configurations to avoid detection or disrupt network monitoring systems. Organizations should implement immediate mitigation strategies including removing unnecessary setuid permissions from the dhcp.client program, implementing proper file permission controls, and conducting comprehensive security audits of all setuid applications. Additionally, network segmentation and monitoring should be enhanced to detect unauthorized network configuration changes that may indicate exploitation attempts. The vulnerability demonstrates the critical importance of proper privilege management in operating system implementations and highlights the need for regular security assessments of system utilities that may inadvertently provide elevated access to local users.