CVE-2018-1000040 in MuPDF
Summary
by MITRE
In MuPDF 1.12.0 and earlier, multiple use of uninitialized value bugs in the PDF parser could allow an attacker to cause a denial of service (crash) or influence program flow via a crafted file.
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Analysis
by VulDB Data Team • 07/12/2024
The vulnerability identified as CVE-2018-1000040 represents a critical security flaw within MuPDF version 1.12.0 and earlier releases, specifically affecting the PDF parser component of this widely-used document processing library. This issue manifests through multiple instances of uninitialized value bugs that can be exploited by malicious actors to compromise system stability and potentially manipulate program execution flow. The affected MuPDF library serves as a foundational component for numerous applications including mobile devices, web browsers, and document management systems, making this vulnerability particularly concerning from a cybersecurity perspective.
The technical nature of this vulnerability stems from improper initialization of variables within the PDF parser's handling of malformed or crafted input files. When processing specially constructed PDF documents, the parser encounters scenarios where memory locations containing uninitialized values are accessed and utilized in program logic decisions. This fundamental flaw in memory management creates opportunities for attackers to manipulate the parser's behavior through carefully crafted malicious files that trigger these uninitialized value conditions. The vulnerability classifies under CWE-457 which specifically addresses use of uninitialized variables, representing a classic example of improper initialization that can lead to unpredictable program behavior.
From an operational impact standpoint, this vulnerability enables attackers to execute denial of service attacks against systems processing PDF documents through MuPDF implementations. The crash conditions can be reliably triggered by submitting maliciously crafted PDF files, potentially causing applications to terminate unexpectedly and disrupting user workflows. More concerning is the potential for attackers to influence program flow through these uninitialized value conditions, which could theoretically be leveraged to execute arbitrary code or escalate privileges depending on the specific implementation details and execution environment. The vulnerability affects both client-side applications and server-side systems that rely on MuPDF for PDF processing, creating widespread exposure across various threat surfaces.
Mitigation strategies for CVE-2018-1000040 primarily focus on immediate remediation through software updates to versions of MuPDF that address these uninitialized value issues. System administrators should prioritize patching all affected installations and verify that the updated versions properly initialize all variables within the PDF parsing logic. Additionally, implementing input validation measures and sandboxing techniques can provide additional layers of protection against exploitation attempts. Organizations should consider deploying network-based intrusion detection systems to monitor for potential exploitation attempts and establish incident response procedures for handling potential exploitation attempts. The vulnerability demonstrates the importance of proper memory management practices and highlights the necessity of thorough code review processes to identify and address uninitialized variable issues in security-critical components. This vulnerability aligns with ATT&CK techniques related to privilege escalation and denial of service through software exploitation, emphasizing the need for comprehensive vulnerability management programs that address both known and emerging threats in document processing libraries.