CVE-2008-3641 in CUPS
Summary
by MITRE
The Hewlett-Packard Graphics Language (HPGL) filter in CUPS before 1.3.9 allows remote attackers to execute arbitrary code via crafted pen width and pen color opcodes that overwrite arbitrary memory.
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Analysis
by VulDB Data Team • 12/29/2024
The vulnerability identified as CVE-2008-3641 represents a critical buffer overflow flaw within the Hewlett-Packard Graphics Language filter component of the Common Unix Printing System CUPS software. This issue affects CUPS versions prior to 1.3.9 and demonstrates a classic memory corruption vulnerability that can be exploited remotely by attackers. The HPGL filter serves as a processing module responsible for interpreting and rendering graphics commands from HPGL formatted print jobs, making it a crucial component in the printing pipeline that handles external input from networked printers and print servers.
The technical exploitation mechanism involves crafting malicious pen width and pen color opcodes within HPGL formatted print commands that deliberately exceed the allocated buffer space in memory. These specific opcodes trigger memory overwrite conditions that can be leveraged to execute arbitrary code on the target system. The vulnerability stems from inadequate input validation and bounds checking within the HPGL filter implementation, where the software fails to properly sanitize or limit the size of parameters passed to internal memory buffers. This flaw directly maps to CWE-121, which describes heap-based buffer overflow conditions, and CWE-787, which addresses out-of-bounds write vulnerabilities. The attack vector is particularly concerning as it operates over network connections where CUPS typically listens for print jobs, making it accessible to remote adversaries without requiring local system access.
The operational impact of this vulnerability extends beyond simple code execution, as successful exploitation could lead to complete system compromise and unauthorized access to sensitive data. Attackers could potentially gain elevated privileges, install persistent backdoors, or use the compromised system as a launch point for further attacks within a network infrastructure. The vulnerability affects systems running CUPS versions before 1.3.9, which were widely deployed in enterprise environments, making the potential attack surface extensive. From an adversarial perspective, this vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as the successful exploitation would enable attackers to execute arbitrary commands on the target system. The remote nature of the exploit also supports ATT&CK technique T1105 for remote service execution, as it allows attackers to leverage network services for malicious code delivery.
Mitigation strategies for CVE-2008-3641 primarily focus on immediate software patching and system hardening measures. Organizations should prioritize upgrading to CUPS version 1.3.9 or later, which includes proper bounds checking and input validation fixes for the HPGL filter component. Network segmentation and firewall rules should be implemented to restrict access to CUPS printing services, particularly on systems that do not require network printing capabilities. Additionally, monitoring systems should be configured to detect unusual print job patterns or malformed HPGL commands that might indicate exploitation attempts. Security teams should also consider disabling the HPGL filter if it is not actively required for business operations, as this reduces the attack surface. The vulnerability underscores the importance of maintaining current software versions and implementing robust input validation practices, particularly for components that process external data formats. Regular security assessments of printing infrastructure and network services should be conducted to identify similar vulnerabilities in other software components that handle untrusted input from network sources.