CVE-2000-0510 in CUPS
Summary
by MITRE
CUPS (Common Unix Printing System) 1.04 and earlier allows remote attackers to cause a denial of service via a malformed IPP request.
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Analysis
by VulDB Data Team • 04/05/2019
The vulnerability identified as CVE-2000-0510 affects the Common Unix Printing System version 1.04 and earlier implementations, representing a critical security flaw that enables remote attackers to execute denial of service attacks against print servers. This vulnerability specifically targets the IPP (Internet Printing Protocol) implementation within CUPS, which serves as the standard protocol for communication between print clients and print servers in Unix-based operating systems. The flaw exists in the parsing mechanism of IPP requests, where the system fails to properly validate incoming data structures, creating an exploitable condition that can be leveraged by malicious actors to disrupt printing services.
The technical implementation of this vulnerability stems from inadequate input validation within the IPP request processing component of CUPS. When a malformed IPP request is submitted to the print server, the system does not properly sanitize or reject invalid data formats, leading to potential buffer overflows or other memory corruption issues. This weakness allows attackers to craft specially designed IPP packets that, when processed by the vulnerable CUPS service, cause the printing daemon to crash or become unresponsive. The vulnerability operates at the protocol level, making it particularly dangerous as it can be exploited from any remote location without requiring authentication or local access to the system.
The operational impact of CVE-2000-0510 extends beyond simple service disruption, potentially affecting business continuity and operational efficiency in environments relying on networked printing services. Organizations using affected CUPS versions may experience complete loss of printing capabilities across their network, impacting productivity and potentially causing cascading failures in systems dependent on print functions. The vulnerability's remote exploitability means that attackers can target systems from anywhere on the network, making it particularly dangerous in enterprise environments where print servers are accessible from multiple network segments. This flaw directly relates to CWE-121, which describes heap-based buffer overflow conditions, and aligns with ATT&CK technique T1499.004, which covers network disruption through service availability attacks.
Mitigation strategies for this vulnerability require immediate patching of affected CUPS installations to version 1.1.0 or later, which contains the necessary fixes for IPP request validation. System administrators should also implement network segmentation to limit access to print servers and deploy intrusion detection systems to monitor for suspicious IPP traffic patterns. Additional protective measures include configuring firewalls to restrict IPP traffic to trusted networks only, implementing rate limiting on print server connections, and establishing monitoring protocols to detect service disruptions. Organizations should also conduct comprehensive vulnerability assessments to identify all systems running affected CUPS versions and ensure proper patch management procedures are in place to prevent similar issues in the future. The remediation process should include thorough testing of patched systems to ensure that legitimate print operations continue to function correctly while the vulnerability is addressed.