CVE-2017-11826 is a high-severity vulnerability that allows remote code execution in multiple Microsoft Office products. The vulnerability arises when the affected software fails to properly handle objects in memory, leading to potential exploitation by attackers. With a CVSS score of 7.8, this vulnerability poses significant risks to organizations using the impacted Microsoft Office versions.
Risk to organizations includes unauthorized access, data loss, and potential disruption of services due to arbitrary code execution. Attackers may leverage this vulnerability to execute malicious code in the context of the current user, which could lead to further compromise of systems and sensitive data.
The urgency for defenders is high, as this vulnerability has been included in the Known Exploited Vulnerabilities (KEV) catalog since March 2022. Organizations should prioritize patching immediately to mitigate potential risks.
Immediate remediation is crucial, and organizations are encouraged to apply updates as outlined in the vendor's advisory to protect against exploitation.
Vulnerability Details
The official description states that Microsoft Office 2010, SharePoint Enterprise Server 2010, SharePoint Server 2010, Web Applications, Office Web Apps Server 2010 and 2013, Word Viewer, Word 2007, 2010, 2013, and 2016, Word Automation Services, and Office Online Server allow remote code execution when the software fails to properly handle objects in memory.
This vulnerability is classified under CWE-119, which relates to improper restriction of operations within the bounds of a memory buffer.
Based on the CVSS 3.1 score, the attack vector is local, with low complexity and no privileges required. User interaction is required, which increases the potential for exploitation. The impacts on confidentiality, integrity, and availability are all rated high.
Technical Analysis
The root cause of CVE-2017-11826 stems from a failure to handle specific objects in memory, leading to memory corruption. The attack vector is local, and it requires user interaction, such as opening a maliciously crafted document. This results in arbitrary code execution within the context of the user who opened the document.
With low attack complexity, an attacker can exploit this vulnerability without requiring significant resources or expertise. The required user interaction adds a layer of complexity, as victims must be persuaded to open the malicious document.
Confidentiality, integrity, and availability impacts are all rated high, meaning successful exploitation could lead to the compromise of sensitive data, modifications to data, and potential service disruptions.
Risk & Impact Analysis
The real-world deployment risk associated with this vulnerability is significant. Organizations using the affected Microsoft Office products are at an increased threat level, especially if they have not implemented the latest security patches. The blast radius of this vulnerability could potentially affect all users of the impacted software within an organization.
Given the high CVSS score and the fact that it is actively exploited, organizations should address this vulnerability as part of their priority patch cycle. The potential for widespread exploitation necessitates immediate action to ensure systems are secure.
Organizations should also consider implementing additional security measures, such as user training and strict email filtering, to mitigate the risk associated with potential phishing attempts that could leverage this vulnerability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The vulnerability affects the following Microsoft products and versions:
• Microsoft Office Compatibility Pack SP3 and later versions • Microsoft Office Online Server 2016 • Microsoft Office Web Apps Server 2010 SP2 and later versions • Microsoft Office Web Apps Server 2013 SP1 and later versions • Microsoft Word Viewer • SharePoint Enterprise Server 2016 • SharePoint Server 2010 SP2 and later versions • SharePoint Server 2013 SP1 and later versions • Microsoft Word 2007 SP3 and later versions • Microsoft Word 2010 SP2 and later versions • Microsoft Word 2013 SP1 and later versions • Microsoft Word 2016
Mitigation & Remediation
Organizations should apply updates as per vendor instructions to mitigate this vulnerability. Microsoft has released patches to address this issue, and it is critical that organizations prioritize these updates in their patch management processes. For more detailed information about the patches, consult the Microsoft Security Response Center.
In addition to applying patches, organizations may consider implementing configuration hardening measures, network controls to limit access to vulnerable systems, and ongoing monitoring to detect any indicators of compromise related to this vulnerability.
Continuous security testing may also help validate the effectiveness of the applied patches and configurations.
Detection Guidance
Organizations should monitor for the following indicators of compromise related to CVE-2017-11826:
• Unusual file access patterns, especially for Word and SharePoint files • Unexpected changes to document properties or metadata • New processes initiated by Office applications that are outside normal operational parameters • Anomalous network activity originating from Office applications
AppSecure Threat Intelligence Insight
CVE-2017-11826 represents a critical vulnerability within widely used Microsoft Office products, highlighting the importance of robust application security practices. The high CVSS score and the inclusion in the KEV catalog indicate a significant threat landscape that organizations must navigate.
Security teams should take this opportunity to review their vulnerability management programs and ensure they are equipped to respond to similar vulnerabilities in the future. Implementing a proactive security strategy, including regular updates and security assessments, can help mitigate the risks associated with such vulnerabilities.
Organizations may also benefit from engaging in application security assessments and red teaming services to identify and remediate vulnerabilities before they can be exploited.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)