CVE-2001-1434 in IOS
Summary
by MITRE
Cisco IOS 12.0(5)XU through 12.1(2) allows remote attackers to read system administration and topology information via an "snmp-server host" command, which creates a readable "community" community string if one has not been previously created.
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Analysis
by VulDB Data Team • 11/17/2024
The vulnerability described in CVE-2001-1434 represents a significant security flaw in Cisco IOS software versions 12.0(5)XU through 12.1(2) that exposes administrative and network topology information to remote attackers. This issue stems from improper handling of SNMP server configurations where the system automatically generates a default community string when an snmp-server host command is executed without an explicitly defined community. The flaw exists in the network operating system's SNMP implementation and demonstrates poor security by design principles in the configuration management process.
The technical mechanism of this vulnerability involves the Cisco IOS SNMP server functionality creating a readable community string when no community has been previously established through the snmp-server host command. This behavior creates a default community string that can be exploited by remote attackers to gain unauthorized access to system administration functions and topology information. The vulnerability is classified as a configuration weakness that allows for information disclosure through the SNMP protocol, which is commonly used for network management and monitoring purposes. This issue directly relates to CWE-200, which covers "Information Exposure" and specifically addresses the unintended disclosure of information through default configurations or improper access controls.
From an operational impact perspective, this vulnerability enables remote attackers to obtain sensitive network topology information and system administration data without requiring authentication or authorization. The exposure of such information provides attackers with valuable intelligence for planning more sophisticated attacks, including identifying network segments, device configurations, and potential attack vectors. The vulnerability essentially provides a backdoor mechanism for information gathering that undermines the fundamental security principles of network segmentation and access control. This type of information disclosure can be leveraged to support other attack vectors as described in the ATT&CK framework under T1082 for System Information Discovery and T1590 for reconnaissance techniques.
The mitigation strategies for this vulnerability should focus on immediate configuration changes to disable or properly configure SNMP community strings, implementing strong access controls, and regularly updating Cisco IOS firmware to versions that address this specific flaw. Network administrators should ensure that SNMP community strings are explicitly defined with strong, unique values rather than relying on default configurations. Additionally, implementing network segmentation, access control lists, and monitoring for unauthorized SNMP traffic can help reduce the attack surface and detect potential exploitation attempts. The vulnerability highlights the importance of proper configuration management and the need for organizations to maintain current security practices to prevent exploitation of default settings that may inadvertently expose sensitive information to unauthorized parties.