CVE-2009-1196 in CUPS
Summary
by MITRE
The directory-services functionality in the scheduler in CUPS 1.1.17 and 1.1.22 allows remote attackers to cause a denial of service (cupsd daemon outage or crash) via manipulations of the timing of CUPS browse packets, related to a "pointer use-after-delete flaw."
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Analysis
by VulDB Data Team • 08/11/2021
The vulnerability identified as CVE-2009-1196 resides within the directory services functionality of the Common Unix Printing System CUPS scheduler version 1.1.17 and 1.1.22. This flaw manifests as a pointer use-after-delete condition that occurs when processing CUPS browse packets, which are essential for network printer discovery and service announcement within printing environments. The issue specifically affects the scheduler component responsible for managing printer directory services and network browsing capabilities, making it a critical component in the printing infrastructure that connects various networked devices.
The technical exploitation of this vulnerability occurs through manipulation of the timing and sequence of CUPS browse packets sent across the network. When the scheduler receives these packets in a specific temporal pattern, it triggers a use-after-delete error where a pointer reference is accessed after the memory location it points to has been freed. This memory management flaw typically results in unpredictable behavior including segmentation faults, daemon crashes, or complete service outages. The vulnerability operates at the application layer and requires no authentication or privileged access to exploit, making it particularly dangerous for networked printing environments where the scheduler is exposed to external network traffic.
The operational impact of this vulnerability extends beyond simple service disruption to encompass complete daemon outages that can severely impact printing operations across an organization. When the cupsd daemon crashes or becomes unresponsive, all network printing services become unavailable until the service is manually restarted or the system is rebooted. This creates cascading effects in enterprise environments where multiple users depend on shared printing resources, potentially disrupting business operations and requiring immediate administrative intervention. The vulnerability affects the availability aspect of the CIA triad and can be classified under CWE-416 as use after free, which is a well-documented memory safety issue that frequently leads to denial of service conditions.
Organizations affected by this vulnerability should prioritize immediate patching of their CUPS installations to version 1.1.23 or later, which contains the necessary memory management fixes to prevent the pointer use-after-delete condition. Network administrators should also implement monitoring solutions to detect unusual patterns of CUPS browse packet traffic that might indicate exploitation attempts. The mitigation strategy aligns with ATT&CK technique T1499.004 for network denial of service attacks, where adversaries target services to disrupt availability. Additionally, implementing network segmentation to limit exposure of the CUPS scheduler to untrusted networks and enabling proper logging of scheduler activities can help detect and prevent exploitation attempts. This vulnerability demonstrates the critical importance of memory safety in print server implementations and highlights the need for regular security updates in enterprise printing infrastructure.