CVE-2005-0206 in CUPS
Summary
by MITRE
The patch for integer overflow vulnerabilities in Xpdf 2.0 and 3.0 (CVE-2004-0888) is incomplete for 64-bit architectures on certain Linux distributions such as Red Hat, which could leave Xpdf users exposed to the original vulnerabilities.
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Analysis
by VulDB Data Team • 07/07/2024
The vulnerability described in CVE-2005-0206 represents a critical flaw in the Xpdf document processing library that affects versions 2.0 and 3.0. This issue emerged from an incomplete patch implementation for the integer overflow vulnerability previously identified as CVE-2004-0888, which specifically targeted the handling of integer values during document parsing operations. The original vulnerability allowed attackers to manipulate integer values in ways that could lead to memory corruption and potential code execution. The remediation effort for this flaw was intended to address the core integer overflow conditions but failed to account for the specific architectural nuances present in 64-bit computing environments. This oversight became particularly problematic on certain Linux distributions including Red Hat systems where the patch did not adequately protect against the original attack vectors.
The technical flaw manifests when Xpdf processes malformed PDF documents on 64-bit architectures, where the incomplete patch fails to properly validate integer values during memory allocation operations. In 64-bit systems, the way integers are handled and the memory addressing patterns differ significantly from 32-bit environments, creating edge cases where the original vulnerability conditions can still be exploited. The integer overflow occurs during the parsing of document elements such as page dimensions, font sizes, or other numerical parameters that are used to calculate memory allocations. When these values exceed the maximum representable integer limits, the resulting behavior can cause unexpected memory access patterns that attackers can manipulate to execute arbitrary code. This vulnerability directly maps to CWE-190, which describes integer overflow conditions, and specifically relates to CWE-191, which addresses integer underflow scenarios that often accompany overflow conditions in memory management contexts.
The operational impact of CVE-2005-0206 extends beyond simple denial of service conditions to potentially enable remote code execution on vulnerable systems. When users open maliciously crafted PDF documents with Xpdf on affected 64-bit Linux distributions, the application becomes susceptible to exploitation through memory corruption attacks. Attackers can craft PDF files that contain manipulated numerical values designed to trigger the integer overflow condition, potentially leading to stack smashing, heap corruption, or other memory-based vulnerabilities that could be leveraged for privilege escalation. The vulnerability affects not only individual users but also organizations that rely on Xpdf for document processing, as the attack surface includes web applications, email clients, and document management systems that utilize this library. This situation creates a significant risk for environments where untrusted PDF content is processed, particularly in enterprise settings where document handling is a common operational requirement.
Mitigation strategies for CVE-2005-0206 require immediate attention from system administrators and security teams responsible for maintaining Xpdf installations. The most effective approach involves upgrading to patched versions of Xpdf that properly address the integer overflow conditions on 64-bit architectures, specifically versions that include comprehensive fixes for both 32-bit and 64-bit environments. Organizations should implement network-based restrictions that prevent access to untrusted PDF content when possible, and deploy intrusion detection systems that can identify suspicious PDF file patterns. Additionally, the implementation of sandboxing techniques and privilege separation during PDF processing can help contain potential exploitation attempts. Security professionals should also consider implementing application whitelisting policies that restrict execution of vulnerable Xpdf versions and ensure that all systems are regularly updated with the latest security patches. The ATT&CK framework categorizes this vulnerability under the T1203 technique for Exploitation for Client Execution, where attackers leverage document processing applications to gain unauthorized access to systems through crafted file content. This vulnerability demonstrates the critical importance of thorough patch validation across different hardware architectures and operating system distributions, as incomplete security fixes can leave systems exposed to the same attack vectors they were designed to prevent.