CVE-2006-0301 in Xpdf
Summary
by MITRE
Heap-based buffer overflow in Splash.cc in xpdf, as used in other products such as (1) poppler, (2) kdegraphics, (3) gpdf, (4) pdfkit.framework, and others, allows attackers to cause a denial of service and possibly execute arbitrary code via crafted splash images that produce certain values that exceed the width or height of the associated bitmap.
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Analysis
by VulDB Data Team • 06/23/2025
The vulnerability identified as CVE-2006-0301 represents a critical heap-based buffer overflow affecting the Splash graphics library component within xpdf software ecosystem. This flaw exists in the Splash.cc source file and impacts multiple downstream implementations including poppler, kdegraphics, gpdf, and pdfkit.framework, demonstrating the widespread nature of this security weakness across various PDF rendering systems. The vulnerability stems from insufficient validation of image dimensions during bitmap processing, creating an exploitable condition where crafted malicious splash images can trigger memory corruption.
The technical implementation of this vulnerability occurs when the system processes splash images that contain malformed width or height values exceeding the allocated bitmap boundaries. During normal operation, the Splash library allocates heap memory based on expected image dimensions, but when attackers provide values that surpass these boundaries, the system attempts to write data beyond the allocated memory space. This heap overflow condition can result in memory corruption that manifests as application crashes, denial of service conditions, or more severely, arbitrary code execution. The vulnerability specifically targets the heap memory management within the graphics rendering pipeline, making it particularly dangerous in environments where PDF processing is automated or user-supplied content is processed.
The operational impact of this vulnerability extends beyond simple denial of service scenarios to encompass potential remote code execution capabilities that could be leveraged by malicious actors. When exploited successfully, attackers can manipulate the heap memory layout to inject and execute malicious code within the context of the affected application, potentially leading to complete system compromise. The widespread adoption of xpdf and its derivatives across multiple operating systems and applications creates a substantial attack surface, as any system processing PDF documents through these vulnerable components could be at risk. This vulnerability particularly affects desktop environments and server applications that handle PDF rendering, making it a significant concern for organizations relying on PDF processing capabilities.
Mitigation strategies for CVE-2006-0301 should prioritize immediate patching of affected systems with updated versions of xpdf, poppler, and related libraries that contain fixed heap boundary checking mechanisms. Organizations should implement input validation controls to sanitize PDF content before processing, particularly focusing on image dimension parameters within splash graphics elements. Network segmentation and access controls can help limit exposure by restricting access to PDF processing services. Additionally, implementing memory protection mechanisms such as stack canaries, address space layout randomization, and data execution prevention can provide additional defense-in-depth measures. The vulnerability aligns with CWE-121 heap-based buffer overflow classification and represents a technique commonly associated with attack vectors in the ATT&CK framework under privilege escalation and code injection categories, emphasizing the need for comprehensive security remediation across all affected software components.