CVE-2017-0261 in Office
Summary
by MITRE
Microsoft Office 2010 SP2, Office 2013 SP1, and Office 2016 allow a remote code execution vulnerability when the software fails to properly handle objects in memory, aka "Office Remote Code Execution Vulnerability". This CVE ID is unique from CVE-2017-0262 and CVE-2017-0281.
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Analysis
by VulDB Data Team • 09/09/2024
The vulnerability identified as CVE-2017-0261 represents a critical remote code execution flaw in Microsoft Office applications including versions 2010 SP2, 2013 SP1, and 2016. This vulnerability stems from improper handling of objects in memory during the processing of specially crafted malicious files, creating a pathway for attackers to execute arbitrary code on affected systems. The flaw specifically affects the way Office applications manage memory objects when parsing certain file formats, particularly those that contain embedded malicious content. This vulnerability is classified under CWE-125, which describes "Out-of-bounds Read" conditions, and falls within the broader category of memory corruption vulnerabilities that have historically proven to be highly exploitable in enterprise environments. The vulnerability is particularly concerning because it allows remote attackers to compromise systems without requiring user interaction beyond opening a malicious document, making it a prime target for zero-day exploits in targeted attacks.
The technical exploitation of CVE-2017-0261 occurs when an Office application processes a specially crafted file that contains malformed memory objects designed to trigger buffer overflows or other memory corruption conditions. Attackers can leverage this vulnerability by delivering malicious Office documents through various attack vectors including email attachments, compromised websites, or malicious file sharing platforms. The vulnerability operates at the memory management level where Office applications fail to properly validate or sanitize memory objects during document parsing, allowing attackers to manipulate memory pointers and execute arbitrary code with the privileges of the affected user. This type of vulnerability aligns with ATT&CK technique T1059.005, which involves the use of command and scripting interpreter, as attackers can leverage the executed code to establish persistence or escalate privileges within the compromised environment.
The operational impact of CVE-2017-0261 extends beyond simple remote code execution to encompass potential full system compromise and data exfiltration capabilities. When successfully exploited, the vulnerability allows attackers to gain unauthorized access to sensitive corporate data, install backdoors, and establish persistent access to network infrastructure. The vulnerability's ability to execute code remotely without user interaction makes it particularly dangerous in enterprise environments where Office applications are frequently used to process documents from external sources. Organizations with outdated Office installations remain vulnerable to this attack vector, as the patch for this vulnerability was released in the February 2017 Microsoft Security Update, making it a common target for threat actors seeking to exploit known vulnerabilities in unpatched systems. The vulnerability's classification as a remote code execution flaw places it within the high-risk category of security issues that can lead to complete system compromise and lateral movement within network environments.
Mitigation strategies for CVE-2017-0261 focus primarily on immediate patch deployment and implementation of additional security controls. Organizations should prioritize immediate deployment of Microsoft Security Update KB4011083 for affected Office versions, as this patch addresses the memory handling flaws that enable the vulnerability. Beyond patching, security administrators should implement strict document validation policies, including disabling macro execution in Office applications, implementing application whitelisting controls, and deploying email filtering solutions that can detect and block malicious Office documents. Network segmentation and monitoring solutions should be enhanced to detect anomalous behavior indicative of exploitation attempts, particularly focusing on unusual outbound connections or process execution patterns. The vulnerability's characteristics make it susceptible to detection through behavioral monitoring tools that can identify memory corruption patterns or unexpected code execution within Office processes. Additionally, regular security awareness training for end users helps reduce the risk of successful exploitation through social engineering attacks that rely on users opening malicious documents. Organizations should also consider implementing automated patch management systems to ensure timely deployment of security updates and reduce the window of exposure to known vulnerabilities like CVE-2017-0261.