CVE-2013-1327 in Publisher 2003
Summary
by MITRE
Integer signedness error in Microsoft Publisher 2003 SP3 allows remote attackers to execute arbitrary code via a crafted Publisher file that triggers an improper memory allocation, aka "Publisher Signed Integer Vulnerability."
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Analysis
by VulDB Data Team • 05/11/2021
The CVE-2013-1327 vulnerability represents a critical integer signedness error in Microsoft Publisher 2003 Service Pack 3 that enables remote code execution through maliciously crafted Publisher files. This vulnerability falls under the CWE-190 category of integer overflow and is classified as a memory corruption issue that occurs during improper memory allocation processes. The flaw specifically manifests when the application processes malformed Publisher documents that contain crafted integer values, leading to unexpected behavior in memory handling operations.
The technical implementation of this vulnerability exploits the difference between signed and unsigned integer representations in memory management. When Publisher encounters a specially crafted file containing malicious integer values, the application fails to properly validate the signedness of these values during memory allocation calculations. This mismanagement results in a situation where the application attempts to allocate memory using a negative or improperly calculated size value, causing the memory allocator to behave unpredictably and potentially allowing attackers to control the allocation process. The vulnerability stems from inadequate input validation and improper handling of integer arithmetic operations within the Publisher file parsing routine.
From an operational perspective, this vulnerability presents a significant threat to organizations relying on Microsoft Publisher 2003, particularly in environments where users may encounter maliciously crafted documents through email attachments, web downloads, or file sharing systems. The remote execution capability means that attackers can exploit this vulnerability without requiring local system access, making it particularly dangerous in enterprise environments. The attack vector typically involves sending a specially crafted Publisher file to a victim, which when opened triggers the vulnerable code path, potentially allowing remote code execution with the privileges of the user running the application. This vulnerability directly maps to ATT&CK technique T1203 (Exploitation for Client Execution) and T1059 (Command and Scripting Interpreter) within the attack framework.
The exploitation of this vulnerability requires careful crafting of Publisher files that contain specific integer values designed to trigger the signedness error during memory allocation. Attackers typically create documents with malformed headers or embedded objects that contain crafted integer fields, which when processed by Publisher 2003 SP3 cause the application to miscalculate memory requirements and execute malicious code. The vulnerability affects only Microsoft Publisher 2003 SP3 and is not present in other Microsoft Office applications, though similar issues may exist in other components of the Microsoft Office suite that handle similar memory allocation patterns. Organizations should note that this vulnerability was addressed through Microsoft security updates, and continued use of unpatched systems exposes them to potential exploitation.
Mitigation strategies for CVE-2013-1327 include immediate application of Microsoft security patches and updates released in response to this vulnerability. System administrators should implement strict file validation policies and consider disabling Publisher file handling in email clients and web browsers. Network-based mitigations such as content filtering and sandboxing techniques can provide additional protection layers. Organizations should also consider implementing least privilege principles, ensuring that users have minimal necessary permissions when opening office documents. The vulnerability highlights the importance of regular security updates and proper input validation in preventing memory corruption exploits. Security monitoring should focus on detecting unusual memory allocation patterns and file opening activities that might indicate exploitation attempts. Regular vulnerability assessments and penetration testing should include evaluation of legacy office applications that may contain similar integer handling flaws.