CVE-2008-1374 in CUPS
Summary
by MITRE
Integer overflow in pdftops filter in CUPS in Red Hat Enterprise Linux 3 and 4, when running on 64-bit platforms, allows remote attackers to execute arbitrary code via a crafted PDF file. NOTE: this issue is due to an incomplete fix for CVE-2004-0888.
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Analysis
by VulDB Data Team • 07/31/2021
The vulnerability described in CVE-2008-1374 represents a critical integer overflow condition within the pdftops filter component of the Common Unix Printing System CUPS software. This flaw specifically affects Red Hat Enterprise Linux versions 3 and 4 when operating on 64-bit architectural platforms, creating a remote code execution vector that adversaries can exploit through carefully crafted PDF files. The vulnerability stems from an incomplete remediation of a previously identified issue, CVE-2004-0888, which demonstrates the complexity of addressing memory safety issues in print processing software. The integer overflow occurs during the processing of PDF documents, where the system fails to properly validate or handle large integer values that exceed the maximum representable value for the data type being used, leading to unpredictable behavior and potential code execution.
The technical implementation of this vulnerability involves the pdftops filter which converts PDF documents to PostScript format for printing purposes. When processing certain malformed PDF files, the filter encounters integer values that cause overflow conditions in memory allocation calculations or buffer size determinations. This type of vulnerability falls under the CWE-190 category for integer overflow and is particularly dangerous in print processing contexts where untrusted input from network sources can be processed without proper validation. The 64-bit platform architecture exacerbates the issue as the larger address space and different memory handling patterns create additional attack surface areas where integer overflow conditions can translate into exploitable memory corruption vulnerabilities. The incomplete fix for CVE-2004-0888 suggests that the initial mitigation was insufficient to address all possible overflow scenarios within the pdftops filter implementation, leaving residual vulnerabilities that attackers could leverage.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete system compromise when exploited successfully. Attackers can craft malicious PDF documents that, when processed by a vulnerable CUPS system, trigger the integer overflow condition and potentially execute arbitrary code with the privileges of the printing system process. This creates a significant risk for enterprise environments where CUPS serves as a central printing infrastructure component, as the compromise of print servers can lead to unauthorized access to network resources, data exfiltration, or further lateral movement within the network. The vulnerability affects systems where PDF-to-PostScript conversion is actively used, making it particularly dangerous in environments with extensive printing capabilities, document management systems, or any infrastructure that processes untrusted PDF content through CUPS. The remote nature of the attack means that exploitation can occur from any network location without requiring physical access to the affected systems.
Mitigation strategies for CVE-2008-1374 should prioritize immediate patching of affected CUPS versions to address the incomplete fix for CVE-2004-0888 and implement comprehensive input validation for PDF processing components. Organizations should deploy the official security updates provided by Red Hat for RHEL 3 and 4, ensuring that all systems running CUPS are updated to versions containing proper integer overflow protections. Network segmentation and access controls should be implemented to limit exposure of printing services to untrusted networks, while monitoring systems should be configured to detect unusual PDF processing activities that might indicate exploitation attempts. The ATT&CK framework categorizes this vulnerability under the T1059.007 technique for command and scripting interpreter with specific relevance to print system exploitation, making it important for security teams to monitor for suspicious print job submissions and processing patterns. Additional defensive measures include implementing sandboxing for PDF processing, restricting PDF file uploads to trusted sources only, and establishing regular vulnerability assessments to identify similar incomplete fixes in other print processing components.