CVE-2003-1515 in ASR-8100
Summary
by MITRE
Origo ASR-8100 ADSL Router 3.21 has an administration service running on port 254 that does not require a password, which allows remote attackers to cause a denial of service by restoring the factory defaults.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 06/17/2018
The CVE-2003-1515 vulnerability affects the Origo ASR-8100 ADSL Router version 3.21, representing a critical security flaw in network infrastructure devices that has persisted for over two decades. This vulnerability demonstrates a fundamental failure in authentication mechanisms within embedded network appliances, where administrative services are exposed without proper access controls. The specific flaw manifests through an administration service that operates on TCP port 254, a non-standard port that typically would not be immediately recognized by standard network scanning tools, yet remains accessible to unauthorized users. The vulnerability is particularly concerning because it allows unauthenticated remote attackers to execute administrative functions, specifically the ability to restore factory defaults, which effectively resets the device configuration to its original state.
The technical implementation of this vulnerability stems from improper privilege management within the router's firmware, where the administrative interface lacks any form of authentication mechanism. This design flaw aligns with CWE-287, which addresses improper authentication issues in software systems, and reflects poor security practices common in embedded systems of that era. The router's administration service operates with elevated privileges by default, and the absence of password protection creates an open door for malicious actors. When an attacker connects to port 254, they can issue commands that trigger the factory reset function, which completely erases all custom configurations, including network settings, user accounts, firewall rules, and other security parameters. This type of vulnerability represents a classic example of insecure by default configurations, where security measures are not implemented until explicitly configured by administrators.
The operational impact of CVE-2003-1515 extends beyond simple denial of service, as it fundamentally compromises the integrity and availability of network services. When an attacker successfully restores factory defaults, they not only disrupt network operations but also potentially expose the network to further attacks by reverting to insecure default settings. The device becomes vulnerable to additional exploitation vectors as default configurations often include weak or predictable passwords, and the router may be left in a state where it is more susceptible to other attacks. The vulnerability also demonstrates the broader issue of network device management where administrators often fail to properly secure administrative interfaces, particularly in environments where devices are deployed without regular security assessments. This flaw can be exploited using standard network reconnaissance tools to identify the open port and then leverage the lack of authentication to execute administrative commands.
From a threat modeling perspective, this vulnerability maps directly to several ATT&CK techniques including T1078 for valid accounts and T1499 for endpoint disruption. The attack surface is particularly dangerous because it requires no specialized tools or advanced knowledge to exploit, making it accessible to a wide range of threat actors. The vulnerability also illustrates the importance of network segmentation and the principle of least privilege in network security architecture. Organizations deploying such devices should implement network segmentation to isolate critical infrastructure from general network access, and ensure that administrative interfaces are properly secured with strong authentication mechanisms. Mitigation strategies include immediate patching if available, network access controls to block access to port 254, and regular security audits of network infrastructure devices. The vulnerability also highlights the importance of firmware updates and the need for organizations to maintain inventories of all network devices and their security status, as many embedded systems from this era lack proper update mechanisms or support from vendors.
The broader implications of this vulnerability demonstrate how security flaws in network infrastructure can have cascading effects on entire network operations and organizational security posture. The fact that this vulnerability was present in a device from 2003 highlights the persistent nature of security issues in legacy systems and the importance of continuous security assessment throughout the lifecycle of network equipment. Organizations should implement robust asset management practices to identify and remediate such vulnerabilities, and consider the use of network monitoring tools that can detect unauthorized access attempts to administrative interfaces. The vulnerability also underscores the need for security awareness training for network administrators, emphasizing that default configurations should never be considered secure and that proper security hardening is essential for all network infrastructure components.