CVE-2002-1384 in pdftops
Summary
by MITRE
Integer overflow in pdftops, as used in Xpdf 2.01 and earlier, xpdf-i, and CUPS before 1.1.18, allows local users to execute arbitrary code via a ColorSpace entry with a large number of elements, as demonstrated by cups-pdf.
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Analysis
by VulDB Data Team • 09/06/2025
The vulnerability identified as CVE-2002-1384 represents a critical integer overflow flaw affecting PDF processing utilities within the Xpdf and CUPS printing systems. This vulnerability resides in the pdftops component which is responsible for converting pdf documents to postscript format. The issue manifests when processing ColorSpace entries within pdf files that contain an excessive number of elements, creating conditions where integer arithmetic operations exceed their maximum representable values. The flaw affects multiple versions of the Xpdf library including version 2.01 and earlier, as well as xpdf-i and CUPS versions prior to 1.1.18, making it a widespread concern across various pdf processing environments.
The technical implementation of this vulnerability involves the improper handling of array sizes during pdf parsing operations. When pdftops encounters a ColorSpace entry with an unusually large number of elements, the integer variables used to track array dimensions overflow beyond their maximum capacity, resulting in unexpected behavior. This overflow condition allows attackers to manipulate memory allocation and processing logic, potentially leading to buffer overflows or other memory corruption issues. The vulnerability specifically targets the ColorSpace entry parsing mechanism, which is a standard component of pdf documents used to define color representation and mapping within the document structure. The integer overflow occurs during the calculation of memory requirements for processing these color space arrays, where the oversized element count causes arithmetic overflow that can be exploited to control program execution flow.
The operational impact of this vulnerability is severe as it enables local privilege escalation and arbitrary code execution on systems running affected software versions. Attackers can craft malicious pdf documents containing specially formatted ColorSpace entries with excessive element counts to trigger the integer overflow condition. When such documents are processed by vulnerable applications, the overflow can be leveraged to overwrite critical memory locations, potentially allowing attackers to execute arbitrary code with the privileges of the affected process. This represents a significant threat in environments where users can submit pdf documents for processing, such as print servers, web applications, or document management systems. The vulnerability affects systems that process pdf documents through the affected pdf to postscript conversion utilities, making it particularly dangerous in enterprise environments where print services are heavily utilized.
The vulnerability aligns with CWE-190, which describes integer overflow conditions that can lead to memory corruption and arbitrary code execution. From an attack framework perspective, this vulnerability maps to ATT&CK technique T1059.007 for command and scripting interpreter, and T1068 for local privilege escalation through software exploitation. The exploitability of this vulnerability is enhanced by the fact that it requires minimal user interaction beyond submitting a malicious pdf document to a vulnerable system. Remediation strategies include upgrading to patched versions of Xpdf, CUPS, and xpdf-i where the integer overflow handling has been corrected through proper bounds checking and input validation. System administrators should also implement additional security measures such as restricting pdf processing capabilities, implementing strict input validation for pdf documents, and monitoring for unusual processing patterns that might indicate exploitation attempts. The vulnerability highlights the importance of robust integer arithmetic handling in security-critical applications and underscores the necessity of thorough input validation in document processing systems.