CVE-2018-0329 in Wide Area Application Services
Summary
by MITRE
A vulnerability in the default configuration of the Simple Network Management Protocol (SNMP) feature of Cisco Wide Area Application Services (WAAS) Software could allow an unauthenticated, remote attacker to read data from an affected device via SNMP. The vulnerability is due to a hard-coded, read-only community string in the configuration file for the SNMP daemon. An attacker could exploit this vulnerability by using the static community string in SNMP version 2c queries to an affected device. A successful exploit could allow the attacker to read any data that is accessible via SNMP on the affected device. Note: The static credentials are defined in an internal configuration file and are not visible in the current operation configuration ('running-config') or the startup configuration ('startup-config'). Cisco Bug IDs: CSCvi40137.
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Analysis
by VulDB Data Team • 03/22/2023
The vulnerability identified as CVE-2018-0329 represents a critical security flaw in Cisco Wide Area Application Services (WAAS) Software that exposes devices to unauthorized data access through the Simple Network Management Protocol. This weakness stems from a fundamental misconfiguration in the SNMP daemon implementation where a hard-coded read-only community string is embedded within the software's internal configuration files. The flaw specifically affects SNMP version 2c implementations and creates an inherent backdoor that bypasses normal authentication mechanisms. Security researchers have classified this issue under CWE-798, which addresses the use of hard-coded credentials in software, making it a prime target for automated exploitation tools and malicious actors seeking unauthorized network access. The vulnerability exists at the configuration layer rather than through network protocols, which makes it particularly insidious as it operates outside the normal visibility of device management interfaces.
The technical exploitation of this vulnerability requires minimal effort from an attacker since the community string is pre-configured and accessible without requiring additional reconnaissance or credential cracking attempts. The hard-coded nature of the community string means that any device running the affected WAAS software version will be vulnerable regardless of network segmentation or access controls. Attackers can simply construct SNMP version 2c queries using the static community string to gain read-only access to all SNMP-accessible data on the device, including system information, network statistics, and potentially sensitive operational details. This attack vector operates entirely outside the normal authentication flow, making it particularly dangerous for devices that rely on SNMP for monitoring and management purposes. The vulnerability affects the operational integrity of the device by providing unauthorized access to configuration data and system metrics that should remain protected from external inspection.
The operational impact of CVE-2018-0329 extends beyond simple data exposure to potentially compromise broader network security postures. Organizations using affected WAAS devices face significant risk as attackers can gather intelligence about network topology, device configurations, and operational parameters that could facilitate more sophisticated attacks. The fact that these credentials are not visible in the running or startup configurations creates a false sense of security for network administrators who may believe their devices are properly secured. This vulnerability aligns with ATT&CK technique T1082, which involves discovering system information through network management protocols, and T1046, which covers network service scanning that can reveal device capabilities and configurations. The impact is particularly severe for enterprise environments where WAAS devices are deployed to optimize network performance, as compromised devices could lead to service degradation or complete network disruption. Organizations may experience unauthorized data collection that could be used for further targeting or lateral movement within their network infrastructure.
Mitigation strategies for this vulnerability require immediate action from affected organizations to ensure device security. The primary recommendation involves applying the relevant Cisco security patches and updates that address the hard-coded community string issue, which typically involve either removing the static credential or replacing it with a dynamically generated, strong authentication mechanism. Network administrators should also implement network segmentation and access control measures to limit SNMP access to trusted management systems only, though this provides only partial protection given that the vulnerability exists at the software configuration level. The remediation process should include comprehensive vulnerability scanning to identify all affected WAAS devices within the network infrastructure, followed by immediate patch deployment and configuration verification. Organizations should also consider implementing network monitoring solutions that can detect unusual SNMP traffic patterns that might indicate exploitation attempts. Additionally, the vulnerability highlights the importance of following secure coding practices and configuration management procedures that prevent hard-coded credentials from being embedded in production software, aligning with industry best practices for secure software development lifecycle implementation.