CVE-2003-0788 in CUPS
Summary
by MITRE
Unknown vulnerability in the Internet Printing Protocol (IPP) implementation in CUPS before 1.1.19 allows remote attackers to cause a denial of service (CPU consumption from a "busy loop") via certain inputs to the IPP port (TCP 631).
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Analysis
by VulDB Data Team • 06/27/2019
The vulnerability identified as CVE-2003-0788 represents a critical denial of service weakness within the Internet Printing Protocol implementation of the Common Unix Printing System. This flaw specifically affects CUPS versions prior to 1.1.19 and manifests through improper handling of certain inputs directed to the IPP port operating on TCP port 631. The issue stems from a design oversight in the protocol processing logic that fails to adequately validate or sanitize incoming IPP requests, creating an exploitable condition that can be leveraged by remote attackers to disrupt printing services.
The technical nature of this vulnerability involves a busy loop condition that consumes excessive CPU resources when the IPP implementation processes malformed or specially crafted inputs. This busy loop occurs within the CUPS printing system's IPP parsing routines, where insufficient input validation allows malicious payloads to trigger continuous processing cycles that drain system resources. The vulnerability operates at the application layer of the network stack, specifically targeting the Internet Printing Protocol daemon that listens on port 631 for incoming print jobs and management commands. The flaw essentially creates an infinite processing loop that prevents the system from handling legitimate print requests while consuming available computational resources.
From an operational perspective, this vulnerability poses significant risks to organizations relying on CUPS-based printing infrastructure. Remote attackers can exploit this weakness to render printing services unavailable, effectively disrupting business operations that depend on document printing capabilities. The impact extends beyond simple service interruption as the CPU consumption from the busy loop can affect overall system performance and potentially impact other services running on the same host. Organizations with networked printing environments, particularly those with multiple CUPS servers or print queues, face increased exposure to this vulnerability as attackers can target any system running vulnerable CUPS versions.
The vulnerability aligns with CWE-770, which addresses the allocation of resources without proper limits or refreshes, and demonstrates characteristics consistent with CWE-122, representing buffer overflow conditions that can lead to resource exhaustion. From an adversary perspective, this vulnerability maps to ATT&CK technique T1499.004, which covers network denial of service attacks through resource exhaustion. The attack vector requires only network connectivity to the target system's IPP port, making it particularly dangerous as it can be exploited from anywhere on the internet. The exploitation process involves sending specially crafted IPP requests that trigger the busy loop condition, requiring minimal technical expertise from attackers while delivering maximum operational disruption.
Mitigation strategies for CVE-2003-0788 primarily focus on upgrading to CUPS version 1.1.19 or later, which includes patches addressing the resource exhaustion vulnerability. Network administrators should implement firewall rules to restrict access to TCP port 631, limiting exposure to trusted networks only and preventing unauthorized remote access to printing services. Additional protective measures include monitoring system resource usage for unusual CPU consumption patterns, implementing intrusion detection systems to identify suspicious IPP traffic patterns, and maintaining up-to-date vulnerability scanning procedures to identify affected systems. Organizations should also consider implementing network segmentation strategies that isolate printing services from critical business systems, reducing the potential impact of successful exploitation attempts. The remediation process requires careful testing of updated CUPS versions to ensure compatibility with existing printing infrastructure while maintaining proper access controls and monitoring procedures for ongoing protection against similar vulnerabilities.