CVE-2006-0746 in kpdf
Summary
by MITRE
Certain patches for kpdf do not include all relevant patches from xpdf that were associated with CVE-2005-3627, which allows context-dependent attackers to exploit vulnerabilities that were present in CVE-2005-3627.
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Analysis
by VulDB Data Team • 01/20/2025
The vulnerability described in CVE-2006-0746 represents a critical security gap in the kpdf document viewer application that stems from incomplete patch application processes. This issue specifically affects the kpdf package, which serves as a PDF viewer for the KDE desktop environment and relies on the underlying xpdf library for core functionality. The vulnerability emerged from a flawed patching strategy where developers failed to incorporate all necessary security fixes from the upstream xpdf library, leaving kpdf susceptible to exploits that were already addressed in the base library. This oversight demonstrates the complexity and risk associated with maintaining security patches across software stacks that depend on multiple interconnected components, where partial patching can create dangerous security gaps.
The technical flaw in question relates to the incomplete implementation of security measures that were originally developed to address vulnerabilities identified in CVE-2005-3627. The xpdf library, which forms the foundation of kpdf's PDF rendering capabilities, contained specific security fixes that were designed to prevent exploitation of memory corruption vulnerabilities and buffer overflows that could lead to arbitrary code execution. When kpdf developers applied patches from the xpdf library, they failed to include all the relevant fixes that were necessary to fully address the security concerns. This partial patching approach created a scenario where attackers could still exploit the remaining vulnerabilities through context-dependent attack vectors that leveraged the incomplete security remediation.
The operational impact of this vulnerability extends beyond simple exploitation capabilities to encompass broader security implications for systems running affected kpdf versions. Organizations using KDE desktop environments with kpdf as their primary PDF viewer faced significant risks, as the vulnerability could be exploited by malicious actors to execute arbitrary code on vulnerable systems. This risk was particularly concerning given that PDF documents are commonly shared in business and government environments, making the exploitation vector highly relevant to real-world attack scenarios. The context-dependent nature of the vulnerability meant that successful exploitation required specific conditions to be met, but once those conditions were satisfied, the consequences could be severe, potentially leading to complete system compromise.
The security implications of CVE-2006-0746 align with common patterns identified in the CWE (Common Weakness Enumeration) catalog, particularly those related to incomplete patch management and software library vulnerabilities. This vulnerability exemplifies CWE-1004, which addresses weaknesses in patch management processes, and demonstrates how partial remediation can leave systems exposed to previously known threats. From an ATT&CK framework perspective, this vulnerability would map to techniques involving privilege escalation and remote code execution through software exploitation, as attackers could leverage the incomplete patch to gain unauthorized access to systems. The issue also reflects broader concerns about supply chain security and the importance of thorough vulnerability assessment when applying security updates to complex software ecosystems that rely on multiple interconnected components. Organizations should have implemented comprehensive testing procedures to verify that all relevant patches from upstream libraries were properly integrated into their kpdf deployments to prevent such security gaps from persisting in production environments.