CVE-2009-3608 in Poppler
Summary
by MITRE
Integer overflow in the ObjectStream::ObjectStream function in XRef.cc in Xpdf 3.x before 3.02pl4 and Poppler before 0.12.1, as used in GPdf, kdegraphics KPDF, CUPS pdftops, and teTeX, might allow remote attackers to execute arbitrary code via a crafted PDF document that triggers a heap-based buffer overflow.
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Analysis
by VulDB Data Team • 12/07/2024
The vulnerability described in CVE-2009-3608 represents a critical integer overflow condition that affects multiple PDF processing libraries including Xpdf 3.x versions prior to 3.02pl4 and Poppler versions before 0.12.1. This flaw manifests within the ObjectStream::ObjectStream function located in XRef.cc, where improper handling of integer values during PDF document parsing creates conditions that can be exploited by remote attackers. The vulnerability impacts widely used software components such as GPdf, KDEgraphics KPDF, CUPS pdftops utility, and teTeX document processing system, making it particularly dangerous due to its widespread deployment across various operating systems and applications. The integer overflow occurs when processing crafted PDF documents that contain maliciously constructed object streams, leading to miscalculations in memory allocation sizes that ultimately result in heap-based buffer overflows. This type of vulnerability falls under CWE-190, which specifically addresses integer overflow conditions that can lead to buffer overflows and arbitrary code execution. The attack vector is remote, meaning that an attacker can exploit this vulnerability simply by delivering a malicious PDF file to a victim who opens it with any of the affected applications, making it particularly concerning for web-based attacks and email attachments.
The technical implementation of this vulnerability involves the manipulation of object stream data structures within PDF documents where the ObjectStream function fails to properly validate or constrain integer values during the calculation of buffer sizes needed for heap allocation. When a malicious PDF contains crafted object stream data that triggers an integer overflow, the resulting calculation produces a value that is significantly smaller than the intended allocation size, but still large enough to cause heap corruption. This heap corruption creates opportunities for attackers to overwrite adjacent memory locations with malicious code, potentially allowing them to execute arbitrary commands with the privileges of the victim's application process. The vulnerability is particularly dangerous because it can be triggered through normal PDF document parsing operations, requiring no special privileges or complex attack scenarios beyond crafting a malicious document. The exploitation chain typically involves the attacker creating a PDF with carefully constructed object stream entries that, when processed by the vulnerable libraries, cause the integer overflow to occur during memory allocation, leading to the buffer overflow condition that can be leveraged for code execution.
The operational impact of this vulnerability extends across multiple domains where PDF processing is utilized, including web browsers, document viewers, print systems, and office applications. Organizations that rely on CUPS printing systems, KDE desktop environments, or teTeX document processing tools are all at risk, as are any applications that incorporate the vulnerable Xpdf or Poppler libraries for PDF handling. The potential for remote code execution means that attackers could gain unauthorized access to systems, escalate privileges, or perform other malicious activities through simple PDF document delivery. This vulnerability particularly affects enterprise environments where PDF documents are frequently shared and opened, creating numerous potential attack surfaces. The exploitability factor is high due to the ease of crafting malicious PDF documents and the widespread use of affected software components, making it a prime target for automated attacks and exploit kits. Organizations running affected versions of these libraries should consider the vulnerability as a critical security concern that requires immediate attention and remediation.
Mitigation strategies for CVE-2009-3608 primarily focus on upgrading to patched versions of the affected software libraries, specifically updating to Xpdf 3.02pl4 or later and Poppler 0.12.1 or later versions. System administrators should prioritize patching all affected applications including GPdf, KPDF, CUPS pdftops, and teTeX installations. Additionally, implementing defensive measures such as PDF document sanitization, restricting PDF file access in web environments, and employing sandboxing techniques can provide additional layers of protection. Network-based mitigations including firewall rules that restrict PDF document handling and content filtering systems that scan PDF files for suspicious patterns can help reduce exposure. The vulnerability demonstrates the importance of proper integer validation and bounds checking in memory management operations, which aligns with ATT&CK technique T1059 for execution through command and scripting interpreter. Organizations should also consider implementing monitoring and alerting systems to detect potential exploitation attempts, particularly around PDF processing activities and memory allocation patterns that might indicate exploitation of similar integer overflow conditions. Regular security assessments and vulnerability scanning should include checks for this specific vulnerability and related integer overflow conditions in all PDF processing software components.