CVE-2008-0121 in PowerPoint Viewer
Summary
by MITRE
A "memory calculation error" in Microsoft PowerPoint Viewer 2003 allows remote attackers to execute arbitrary code via a PowerPoint file with an invalid picture index that triggers memory corruption, aka "Memory Calculation Vulnerability."
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Analysis
by VulDB Data Team • 08/01/2021
The vulnerability identified as CVE-2008-0121 represents a critical memory calculation error within Microsoft PowerPoint Viewer 2003 that exposes systems to remote code execution attacks. This flaw specifically manifests when the viewer processes PowerPoint files containing invalid picture indices, creating conditions that lead to memory corruption and potential arbitrary code execution. The vulnerability operates at the intersection of memory management and file parsing, where improper handling of malformed picture data triggers unpredictable behavior in the application's memory allocation routines. This type of vulnerability falls under the CWE-125 weakness category, which encompasses out-of-bounds read errors that can lead to memory corruption and arbitrary code execution. The attack vector leverages remote code execution through malicious PowerPoint files, making it particularly dangerous in environments where users may encounter untrusted Office documents.
The technical implementation of this vulnerability stems from PowerPoint Viewer 2003's insufficient validation of picture index values within presentation files. When processing a malformed PowerPoint file, the application fails to properly validate the picture index references, leading to calculations that exceed allocated memory boundaries. This memory calculation error creates a condition where the application attempts to access memory locations that have not been properly allocated or are outside the expected bounds of the picture data structure. The flaw demonstrates characteristics consistent with buffer overflow vulnerabilities, where the improper calculation of memory requirements allows attackers to manipulate memory layout and execute malicious code. The vulnerability can be exploited through social engineering techniques where users open malicious PowerPoint files, triggering the memory corruption during normal file processing operations.
The operational impact of CVE-2008-0121 extends beyond simple remote code execution to encompass complete system compromise when exploited successfully. Attackers leveraging this vulnerability can gain unauthorized access to systems running vulnerable PowerPoint Viewer versions, potentially leading to data theft, system infiltration, or deployment of additional malware. The vulnerability affects organizations that rely on older Office Viewer components, particularly those with legacy systems or restricted update environments where newer security patches cannot be deployed immediately. This creates a persistent risk for enterprises that have not fully migrated to current Office versions, as the vulnerable component remains exposed to exploitation. The threat landscape for this vulnerability aligns with ATT&CK technique T1203, which covers legitimate program execution through exploitation of vulnerabilities in software components, and T1059, covering execution through command and scripting interpreters.
Mitigation strategies for CVE-2008-0121 should focus on immediate patching of affected systems, as Microsoft released security updates addressing this specific vulnerability through their regular security bulletin process. Organizations must ensure complete removal of vulnerable PowerPoint Viewer 2003 components from systems and implement strict file validation policies for Office document processing. Network-based defenses should include content filtering solutions that scan Office documents for malformed structures and prevent execution of suspicious files. The vulnerability highlights the importance of maintaining up-to-date software components and implementing defense-in-depth strategies that reduce attack surface exposure. System administrators should also consider implementing application whitelisting policies that restrict execution of Office Viewer components unless explicitly required for business operations. Regular security assessments and vulnerability scanning should include checks for deprecated Office Viewer components to prevent exploitation of this and similar legacy vulnerabilities.