CVE-2000-1063 in Jetdirect
Summary
by MITRE
Buffer overflow in the Telnet service in HP JetDirect printer card Firmware x.08.20 and earlier allows remote attackers to cause a denial of service.
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Analysis
by VulDB Data Team • 05/28/2018
The vulnerability identified as CVE-2000-1063 represents a critical buffer overflow flaw within the Telnet service implementation of HP JetDirect printer cards running firmware versions x.08.20 and earlier. This issue resides in the network communication layer of these embedded devices, specifically affecting the Telnet daemon that handles remote administrative access to the printer configurations. The buffer overflow occurs when the service processes incoming network data without proper bounds checking, allowing malicious input to overwrite adjacent memory locations in the system's execution space.
The technical exploitation of this vulnerability stems from insufficient input validation within the Telnet service code, which fails to properly sanitize user-supplied data before processing. When an attacker sends specially crafted data packets to the Telnet service port, the malformed input causes the buffer to exceed its allocated memory boundaries, potentially leading to arbitrary code execution or system crash. This flaw directly maps to CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The vulnerability represents a classic example of insecure coding practices in embedded systems where memory management is not properly enforced.
From an operational perspective, this vulnerability creates significant risk for organizations relying on HP JetDirect printer cards for networked printing services. The remote nature of the attack means that unauthorized parties can exploit this flaw from any location on the network, potentially causing complete service disruption through denial of service conditions. The impact extends beyond simple service interruption as the vulnerability could theoretically be leveraged for more sophisticated attacks if the system allows for arbitrary code execution, though the specific exploitation path in this case primarily results in service availability disruption. Network administrators face the challenge of securing embedded devices that often lack proper update mechanisms and may be overlooked in standard security assessments.
The mitigation strategy for CVE-2000-1063 requires immediate firmware updates from HP to address the buffer overflow condition in the Telnet service implementation. Organizations should also implement network segmentation to isolate these devices from critical network segments, disable unnecessary Telnet services where possible, and deploy network monitoring solutions to detect anomalous traffic patterns. The ATT&CK framework categorizes this vulnerability under T1210 - Exploitation of Remote Services, highlighting the importance of securing network-facing services. Additionally, implementing network access controls such as firewalls and access control lists can prevent unauthorized access to the affected Telnet ports while ensuring that legitimate administrative access remains available through secure channels. Regular vulnerability assessments and network scanning should be conducted to identify other potentially affected embedded devices within the organization's infrastructure.