CVE-2013-0729 in PDF-XChange
Summary
by MITRE
Heap-based buffer overflow in Tracker Software PDF-XChange before 2.5.208 allows remote attackers to execute arbitrary code via a crafted Define Huffman Table header in a JPEG image file stream in a PDF file.
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Analysis
by VulDB Data Team • 05/09/2026
The vulnerability identified as CVE-2013-0729 represents a critical heap-based buffer overflow within Tracker Software's PDF-XChange application version 2.5.208 and earlier. This flaw resides in the application's handling of JPEG image data embedded within PDF documents, specifically when processing the Define Huffman Table header within JPEG streams. The vulnerability stems from inadequate bounds checking during the parsing of JPEG compression data structures, creating an exploitable condition that can be triggered remotely through maliciously crafted PDF files.
The technical implementation of this vulnerability involves the improper management of heap memory allocation when processing JPEG image data embedded in PDF documents. When PDF-XChange encounters a PDF file containing a JPEG image stream with a specially crafted Define Huffman Table header, the application fails to validate the size and structure of the Huffman table data before attempting to copy it into a fixed-size heap buffer. This classic buffer overflow condition occurs because the application does not properly verify that the incoming data fits within the allocated memory space, allowing an attacker to overwrite adjacent memory locations with malicious payload data.
The operational impact of this vulnerability extends beyond simple code execution, as it provides remote attackers with the ability to execute arbitrary code with the privileges of the affected application. This represents a significant escalation from a mere denial of service condition to a full remote code execution vulnerability. The attack vector requires only that a user open a maliciously crafted PDF file containing the specially constructed JPEG data, making it particularly dangerous in phishing campaigns or malicious document distribution scenarios. The vulnerability affects all versions of PDF-XChange prior to 2.5.208, indicating that a substantial user base could be exposed to this risk.
From a cybersecurity perspective, this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and demonstrates characteristics consistent with ATT&CK technique T1203, involving exploitation of software vulnerabilities for code execution. The flaw represents a prime example of how embedded image processing components in document viewers can introduce critical security risks, particularly when handling compressed image formats like JPEG that require complex parsing routines. Organizations using PDF-XChange should prioritize immediate patching to address this vulnerability, as the combination of remote exploitability and arbitrary code execution capabilities makes it a high-priority threat. The vulnerability also highlights the importance of input validation in multimedia processing components and the need for robust memory management practices in applications that handle complex file formats with embedded binary data streams.
The remediation approach for this vulnerability requires updating to PDF-XChange version 2.5.208 or later, which includes proper bounds checking and memory management for JPEG image data processing. Security administrators should also implement additional protective measures such as PDF content filtering, sandboxing of PDF processing, and user education regarding the dangers of opening untrusted PDF documents. Network-level protections can be implemented through email filtering and web proxies that scan PDF files for malicious content before delivery to end users. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date software components and the potential risks associated with complex multimedia processing within document viewers and office applications.