CVE-2008-2950 in Poppler
Summary
by MITRE
The Page destructor in Page.cc in libpoppler in Poppler 0.8.4 and earlier deletes a pageWidgets object even if it is not initialized by a Page constructor, which allows remote attackers to execute arbitrary code via a crafted PDF document.
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Analysis
by VulDB Data Team • 03/20/2025
The vulnerability described in CVE-2008-2950 represents a critical memory management flaw within the Poppler PDF rendering library, specifically affecting versions 0.8.4 and earlier. This issue resides in the Page destructor implementation within the Page.cc source file, where improper object lifecycle management creates a dangerous condition that can be exploited by remote attackers. The flaw occurs when a pageWidgets object is deleted without proper initialization checks, creating a scenario where memory corruption can occur during the cleanup process of PDF page objects.
The technical nature of this vulnerability stems from a classic use-after-free condition that falls under CWE-416, where memory is freed twice or accessed after deallocation. When processing maliciously crafted PDF documents, the Page constructor may not properly initialize the pageWidgets object, yet the destructor still attempts to delete it regardless of initialization state. This improper handling creates a situation where attackers can manipulate the PDF parsing process to trigger the vulnerable code path, leading to potential memory corruption and arbitrary code execution. The vulnerability is particularly concerning because it operates at the core rendering layer of PDF processing, making it accessible through normal PDF document parsing operations.
The operational impact of this vulnerability extends beyond simple code execution, as it represents a remote code execution vector that can be exploited through web browsers, PDF viewers, or any application that utilizes the affected Poppler library version. Attackers can craft malicious PDF documents that, when opened or processed by vulnerable applications, will trigger the memory corruption during page destruction. This creates a significant risk for end users and organizations that rely on PDF processing capabilities, as the exploitation requires no special privileges or user interaction beyond opening the malicious document. The vulnerability affects a wide range of applications including web browsers, email clients, and document viewers that depend on Poppler for PDF rendering functionality.
Mitigation strategies for this vulnerability require immediate patching of affected Poppler library versions to 0.8.5 or later, where the memory management issue has been corrected through proper initialization checks in the Page destructor. Organizations should implement comprehensive patch management processes to ensure all systems utilizing Poppler are updated promptly. Additionally, deploying PDF content filtering solutions and implementing sandboxing mechanisms can provide additional defense-in-depth layers. Security controls should include monitoring for suspicious PDF file processing patterns and implementing strict access controls for PDF handling applications. The vulnerability demonstrates the importance of proper object lifecycle management in memory-safe programming practices and highlights the need for thorough code review processes to identify similar issues in complex software libraries. This flaw serves as a reminder of the critical security implications that can arise from seemingly simple memory management errors in widely-used open source components.