CVE-2001-1087 in Netcache
Summary
by MITRE
The default configuration of the config.http.tunnel.allow_ports option on NetCache devices is set to +all, which allows remote attackers to connect to arbitrary ports on remote systems behind the device.
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Analysis
by VulDB Data Team • 05/31/2018
The vulnerability described in CVE-2001-1087 represents a critical misconfiguration issue within NetCache devices that fundamentally compromises network security boundaries. This flaw exists in the default settings of the config.http.tunnel.allow_ports parameter, which when configured to +all permits unrestricted access to any port on systems located behind the NetCache device. The configuration essentially creates a backdoor mechanism that bypasses normal network segmentation controls, allowing unauthorized remote access to internal network resources that should remain protected from external exposure.
This technical flaw operates at the network layer and represents a classic example of insufficient access control and improper privilege management. The +all setting in the allow_ports configuration parameter enables any TCP port to be accessed through the HTTP tunneling mechanism, effectively transforming the NetCache device from a protective network gateway into a potential attack vector. The vulnerability demonstrates a fundamental failure in implementing defense-in-depth principles where the device itself becomes a conduit for malicious actors to traverse network perimeters without proper authentication or authorization checks.
The operational impact of this vulnerability extends beyond simple port access, creating a pathway for comprehensive network reconnaissance and exploitation activities. Attackers can leverage this misconfiguration to scan internal networks, identify vulnerable services, and potentially gain access to sensitive systems that would normally be protected by the network firewall. This vulnerability aligns with CWE-284, which addresses improper access control, and represents a specific instance where default configurations fail to implement proper security boundaries. The implications are particularly severe because the vulnerability exists in the default state of the device, meaning that organizations deploying NetCache systems without proper configuration changes are immediately exposed to this risk.
The attack surface created by this vulnerability allows for various malicious activities including port scanning, service enumeration, and potential exploitation of vulnerable internal services. Network defenders face significant challenges when this vulnerability exists because the attack vector is not immediately apparent and can be exploited without detection. The configuration issue directly relates to ATT&CK technique T1046 which covers network service scanning, and T1566 which addresses credential harvesting through various attack vectors. Organizations may experience unauthorized data access, system compromise, and potential lateral movement within their networks when this vulnerability is exploited.
Mitigation strategies for CVE-2001-1087 require immediate configuration changes to restrict the allow_ports parameter from its default +all setting to specific, necessary ports only. Network administrators must implement proper access control lists that limit tunneling capabilities to only essential services and ports required for legitimate business operations. Regular security audits should verify that default configurations have been properly modified and that network access controls remain effective. The remediation process should include comprehensive network segmentation policies, implementation of network monitoring systems to detect unauthorized tunneling activities, and regular vulnerability assessments to ensure that similar misconfigurations do not exist in other network components. Additionally, organizations should establish configuration management procedures that prevent default settings from being used in production environments without explicit security review and approval processes.