CVE-2008-0597 in CUPS
Summary
by MITRE
Use-after-free vulnerability in CUPS before 1.1.22, and possibly other versions, allows remote attackers to cause a denial of service (crash) via crafted IPP packets.
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Analysis
by VulDB Data Team • 08/06/2019
The vulnerability identified as CVE-2008-0597 represents a critical use-after-free flaw within the Common Unix Printing System CUPS software version 1.1.22 and earlier. This issue affects the core printing subsystem that manages printer communications and job processing across unix-like operating systems. The vulnerability specifically resides in how CUPS handles Internet Printing Protocol (IPP) packets, which are standard network protocols used for communicating with printers and managing print jobs. The flaw allows remote attackers to exploit the system by sending specially crafted IPP packets that trigger memory management errors during print job processing. This type of vulnerability falls under the CWE-416 category of Use After Free, which occurs when a program continues to reference memory after it has been freed, potentially leading to unpredictable behavior and system instability.
The technical exploitation of this vulnerability involves sending malformed IPP packets to a target system running vulnerable CUPS software, which causes the application to access memory that has already been deallocated. When the system attempts to process these crafted packets, the memory management routines fail to properly handle the freed memory references, resulting in a crash of the CUPS daemon process. This crash effectively renders the printing service unavailable, causing a denial of service condition that impacts legitimate users attempting to submit print jobs. The vulnerability is particularly concerning because it can be exploited remotely without requiring authentication, making it accessible to any attacker who can send network packets to the target system's IPP port. The attack vector aligns with ATT&CK technique T1499.004 which covers network denial of service attacks.
The operational impact of this vulnerability extends beyond simple service disruption, as it can affect critical business operations that depend on printing services. Organizations using affected CUPS versions may experience interruptions in document processing workflows, particularly in environments where printing is integral to business processes. The vulnerability affects systems across multiple platforms including various unix and linux distributions that rely on CUPS for printing functionality. The remote nature of the attack means that adversaries can exploit this vulnerability from anywhere on the network, potentially allowing for coordinated attacks against multiple systems or the use of this vulnerability as part of broader exploitation campaigns. The flaw demonstrates a fundamental memory safety issue in the software's handling of network input, highlighting the importance of proper resource management in server applications. System administrators should prioritize patching affected systems to prevent exploitation, as the vulnerability can be easily automated and does not require sophisticated attack capabilities. The remediation involves upgrading to CUPS version 1.1.22 or later, which includes proper memory management fixes that prevent the use-after-free condition from occurring. Organizations should also implement network segmentation and access controls to limit exposure of printing services to untrusted networks. The vulnerability serves as a reminder of the critical importance of input validation and proper memory management in network-facing applications, particularly those handling untrusted data from remote sources.