CVE-2007-4045 in CUPS
Summary
by MITRE
The CUPS service, as used in SUSE Linux before 20070720 and other Linux distributions, allows remote attackers to cause a denial of service via unspecified vectors related to an incomplete fix for CVE-2007-0720 that introduced a different denial of service problem in SSL negotiation.
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Analysis
by VulDB Data Team • 07/31/2019
The vulnerability identified as CVE-2007-4045 affects the Common Unix Printing System CUPS service implementation across various Linux distributions including SUSE Linux prior to version 20070720. This issue represents a regression in the security fixes applied to address a previous vulnerability, specifically CVE-2007-0720, which demonstrates the complexity and potential risks associated with security patch management in enterprise environments. The flaw manifests within the SSL negotiation process of the CUPS service, indicating that the security mechanisms designed to protect print services are themselves compromised.
The technical nature of this vulnerability lies in the incomplete or flawed implementation of security measures that were intended to resolve the earlier CVE-2007-0720 issue. When attackers exploit the SSL negotiation process, they can trigger a denial of service condition that disrupts the normal operation of the printing service. This represents a critical weakness in the service's ability to maintain availability, as the SSL handshake mechanism that should secure communications becomes a vector for service disruption. The vulnerability operates at the protocol level within the CUPS implementation, affecting how the service handles secure connections and authentication processes.
From an operational impact perspective, this vulnerability creates a significant risk to organizations relying on network printing services, particularly those with remote access capabilities. The denial of service condition can prevent legitimate users from accessing print services, potentially disrupting business operations and requiring system administrators to intervene. The fact that this vulnerability emerged from an incomplete fix for a previous issue highlights the importance of thorough regression testing and quality assurance processes in security patches. Organizations may experience unexpected service interruptions and increased administrative overhead as they respond to this vulnerability.
The remediation approach for CVE-2007-4045 requires updating the CUPS service to versions that properly address both the original vulnerability and the regression introduced by the incomplete fix. System administrators should prioritize applying the vendor-specific patches released after the initial vulnerability disclosure, ensuring that the updated versions contain complete and tested security measures. Additionally, organizations should implement network monitoring to detect unusual SSL negotiation patterns that might indicate exploitation attempts. The vulnerability's classification aligns with CWE-20, which addresses improper input validation, and may map to ATT&CK techniques related to service stoppage and availability disruption. Organizations should also consider implementing additional network segmentation and access controls to limit the attack surface and reduce the potential impact of such vulnerabilities in their printing infrastructure.