CVE-2007-6534 in Publisher
Summary
by MITRE
Multiple unspecified vulnerabilities in Microsoft Office Publisher allow user-assisted remote attackers to cause a denial of service (application crash) via a crafted PUB file, possibly involving wordart.
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Analysis
by VulDB Data Team • 09/13/2018
The vulnerability identified as CVE-2007-6534 represents a significant security flaw within Microsoft Office Publisher that exposes users to potential denial of service attacks through maliciously crafted PUB files. This vulnerability falls under the category of unspecified multiple vulnerabilities, indicating that the exact technical details of each flaw remain undisclosed in the initial CVE description, though the impact and attack vector are clearly defined. The affected software component is Microsoft Office Publisher, which is part of the Microsoft Office suite used for desktop publishing and document creation. The vulnerability specifically targets the application's handling of wordart elements within PUB files, suggesting that the flaw may be related to how the software processes and renders these graphical text elements. The user-assisted nature of this attack implies that the malicious PUB file must be opened or interacted with by an end user for the exploit to be successful, making social engineering a potential prerequisite for the attack vector. This classification places the vulnerability in the context of application-level security flaws that can compromise system availability and user productivity.
The technical execution of this vulnerability involves the manipulation of PUB file structures to trigger application crashes during normal operation. When a user opens a specially crafted PUB file containing malicious wordart elements, the Publisher application fails to properly handle the malformed data, resulting in an application crash that terminates the program unexpectedly. This behavior constitutes a denial of service condition where legitimate users cannot access their documents or continue working with the affected software. The wordart functionality in Publisher provides users with various text formatting and graphical effects, but the vulnerability suggests that the parsing or rendering engine for these elements lacks proper input validation and error handling mechanisms. The unspecified nature of the vulnerabilities indicates that there may be multiple distinct code paths within the Publisher application that can be exploited through similar techniques, potentially affecting different aspects of the software's functionality. This type of vulnerability typically stems from inadequate bounds checking, memory management issues, or insufficient sanitization of user-supplied data within the application's core processing modules.
The operational impact of CVE-2007-6534 extends beyond simple application instability, potentially disrupting business operations and user productivity in environments where Microsoft Office Publisher is extensively used. Organizations relying on Publisher for document creation, marketing materials, or professional publishing tasks may experience significant downtime when users encounter these crashes, particularly in scenarios where multiple users are affected simultaneously or when critical documents are being processed. The vulnerability's user-assisted requirement means that successful exploitation typically requires social engineering tactics to convince users to open malicious files, but once triggered, the impact is immediate and disruptive. From a cybersecurity perspective, this vulnerability represents a low-barrier attack vector that can be leveraged by threat actors to create chaos or potentially mask more sophisticated attacks. The denial of service condition affects the availability aspect of the CIA triad, making it particularly concerning for enterprise environments where consistent access to productivity tools is essential for business continuity. This vulnerability also demonstrates the importance of secure software development practices and the need for comprehensive input validation in all software components, especially those handling user-supplied content.
Mitigation strategies for CVE-2007-6534 should focus on both immediate protective measures and long-term security improvements within the Microsoft Office ecosystem. The most effective immediate response involves applying the relevant Microsoft security updates and patches that address this vulnerability, as these updates typically contain fixes for the underlying code flaws that cause the application crashes. Organizations should implement strict file validation procedures, including the use of antivirus and anti-malware solutions that can detect and block malicious PUB files before they can be opened by users. Network-based security controls such as email filtering and web content filtering can help prevent users from accessing potentially malicious files through email attachments or web downloads. User education and awareness programs should emphasize the importance of only opening files from trusted sources and being cautious when encountering unexpected PUB files, particularly those received through email or downloaded from untrusted websites. The vulnerability's classification aligns with CWE-129, which addresses improper validation of input boundaries, and may also relate to CWE-20, which covers input validation issues. From an ATT&CK framework perspective, this vulnerability could be categorized under techniques involving application layer attacks or privilege escalation, though the specific mapping depends on the exact exploitation methodology. Organizations should also consider implementing application whitelisting policies to restrict execution of unauthorized software and reduce the attack surface. Regular security assessments and penetration testing can help identify similar vulnerabilities in other software components and ensure comprehensive protection against similar threats. The vulnerability underscores the critical importance of maintaining current security patches and implementing defense-in-depth strategies that protect against various attack vectors while ensuring business continuity and system availability.