CVE-2006-5296 in PowerPoint
Summary
by MITRE
PowerPoint in Microsoft Office 2003 does not properly handle a container object whose position value exceeds the record length, which allows user-assisted attackers to cause a denial of service (NULL dereference and application crash) via a crafted PowerPoint (.PPT) file, as demonstrated by Nanika.ppt, and a different vulnerability than CVE-2006-3435, CVE-2006-3876, CVE-2006-3877, and CVE-2006-4694. NOTE: the impact of this issue was originally claimed to be arbitrary code execution, but later analysis demonstrated that this was erroneous.
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Analysis
by VulDB Data Team • 04/24/2026
This vulnerability affects Microsoft Office 2003 PowerPoint applications and represents a classic buffer overflow condition within the file parsing mechanism. The flaw occurs when PowerPoint processes container objects in presentation files where the position value exceeds the actual record length, creating a scenario where the application attempts to access memory locations that are either invalid or uninitialized. This specific condition triggers a NULL dereference error that results in application crash rather than the initially reported arbitrary code execution capability. The vulnerability demonstrates a clear failure in input validation and memory management within the PowerPoint file parser component.
The technical implementation of this vulnerability involves the manipulation of PowerPoint file structure elements where container objects contain position metadata that references memory locations beyond the legitimate record boundaries. When the application attempts to process these malformed container objects, it fails to properly validate the position values against the actual record length, leading to an out-of-bounds memory access. This memory access pattern aligns with CWE-125, which describes out-of-bounds read conditions, and CWE-476, which covers NULL pointer dereference scenarios. The attack vector requires user interaction through the opening of a specifically crafted .ppt file, making it a user-assisted remote code execution vulnerability rather than a fully autonomous attack.
From an operational impact perspective, this vulnerability severely compromises the availability and stability of Microsoft Office 2003 installations. The denial of service condition affects end users by causing unexpected application crashes and preventing normal document processing operations. Organizations relying on PowerPoint presentations for business communications face significant disruption when encountering maliciously crafted files, as the application becomes unusable until manually restarted. The vulnerability affects the core functionality of the presentation software and can be exploited in targeted attacks against specific users or organizations through spear-phishing campaigns. The initial claim of arbitrary code execution capability was later debunked through detailed analysis, confirming that while the vulnerability can cause system instability, it does not provide direct code execution privileges.
Mitigation strategies for this vulnerability should focus on immediate patch deployment through Microsoft's security updates, which address the improper handling of container objects in PowerPoint file parsing. Organizations should implement strict file validation policies and restrict the opening of PowerPoint files from untrusted sources. Network-level protections can include email filtering systems that scan for potentially malicious .ppt files and application whitelisting controls that prevent unauthorized file execution. The vulnerability also highlights the importance of maintaining up-to-date security patches and demonstrates how seemingly minor parsing flaws can result in significant operational disruptions. Security teams should monitor for indicators of compromise related to this vulnerability and ensure that all Office 2003 installations are properly updated to prevent exploitation attempts. This case study exemplifies how legacy software vulnerabilities continue to pose risks even after initial discovery and underscores the necessity of comprehensive vulnerability management programs.