CVE-2018-8524 in Outlook
Summary
by MITRE
A remote code execution vulnerability exists in Microsoft Outlook software when it fails to properly handle objects in memory, aka "Microsoft Outlook Remote Code Execution Vulnerability." This affects Office 365 ProPlus, Microsoft Office, Microsoft Outlook. This CVE ID is unique from CVE-2018-8522, CVE-2018-8576, CVE-2018-8582.
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Analysis
by VulDB Data Team • 06/06/2023
This vulnerability represents a critical remote code execution flaw in Microsoft Outlook software that stems from improper handling of objects in memory during the processing of specially crafted email messages. The vulnerability specifically affects Microsoft Outlook versions included in Office 365 ProPlus and standalone Microsoft Office installations, making it a widespread concern across enterprise email environments. The flaw occurs when Outlook attempts to parse and render maliciously constructed email content, particularly within rich text formatting or embedded objects that trigger memory corruption during normal processing operations.
The technical nature of this vulnerability aligns with common software security weaknesses categorized under CWE-125, which describes out-of-bounds read conditions, and CWE-787, which covers out-of-bounds write operations. These memory handling issues typically arise when applications fail to properly validate input data before processing it in memory, creating opportunities for attackers to manipulate memory contents and execute arbitrary code. The vulnerability manifests when Outlook encounters malformed email content that causes the application to improperly manage memory allocation and deallocation during object processing, potentially allowing attackers to overwrite memory locations with malicious code.
From an operational perspective, this vulnerability presents a severe threat to enterprise security as it enables remote attackers to execute code on affected systems without requiring user interaction beyond receiving a malicious email message. The attack vector typically involves sending specially crafted emails containing malicious attachments or embedded content that triggers the vulnerable code path when Outlook processes the message. This makes it particularly dangerous in corporate environments where Outlook is the primary email client and users regularly receive emails from external sources. The vulnerability affects both desktop and mobile versions of Outlook, though the impact may vary depending on the specific version and configuration.
The exploitability of this vulnerability places it within the ATT&CK framework under techniques such as T1203, Exploitation for Client Execution, and T1059, Command and Scripting Interpreter, as attackers can leverage the remote code execution capability to establish persistent access to target systems. Organizations with affected Outlook installations face significant risk of data breaches, system compromise, and potential lateral movement within their networks. The vulnerability's impact extends beyond individual user compromise to potentially enable attackers to gain access to sensitive corporate data, establish backdoors, or use compromised systems as launching points for further attacks. Mitigation strategies should include immediate patch deployment, email filtering solutions to identify and block malicious content, and user education regarding suspicious email attachments and links. Additionally, organizations should implement network segmentation and monitoring to detect potential exploitation attempts and limit the blast radius of successful attacks.