CVE-2023-29330 in Teams
Summary
by MITRE • 08/08/2023
Microsoft Teams Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 06/18/2026
Microsoft Teams represents one of the most widely adopted collaboration platforms globally, serving millions of users across enterprise environments and facilitating critical business communications. The platform's architecture incorporates multiple components including client applications, server-side services, and integration points with various Microsoft 365 services. Given its pervasive deployment and the sensitive nature of communications it handles, vulnerabilities within Teams can present significant security risks to organizations. The remote code execution vulnerability in question affects the platform's handling of specific data processing operations, creating potential attack vectors that could be exploited by malicious actors to gain unauthorized system access.
The technical flaw manifests in the improper validation and processing of user-supplied data within Teams' message handling and file processing components. When users receive or interact with specially crafted messages containing malicious payloads, the platform fails to adequately sanitize input parameters before executing processing routines. This vulnerability stems from insufficient data validation mechanisms that allow attackers to inject code that executes within the Teams client context or server-side processing pipelines. The flaw operates at the application layer and can be triggered through various attack vectors including message exchanges, file sharing operations, and integration with third-party applications. According to CWE classification, this vulnerability aligns with CWE-74, which addresses improper neutralization of special elements used in data queries, and CWE-121, concerning stack-based buffer overflow conditions. The underlying mechanism allows for arbitrary code execution with the privileges of the affected Teams process, potentially enabling attackers to establish persistent access or escalate privileges within the target environment.
The operational impact of this vulnerability extends beyond individual user compromise to potentially affect entire organizational networks and data integrity. Attackers exploiting this flaw could gain unauthorized access to sensitive communications, intercept user data, or establish backdoor access points within corporate networks. The distributed nature of Teams deployments across multiple devices and platforms increases the attack surface, as compromised endpoints could serve as entry points for lateral movement within organizations. Organizations utilizing Teams for critical business operations face heightened risk of data breaches, intellectual property theft, and compliance violations. The vulnerability's exploitation could result in significant financial losses, regulatory penalties, and reputational damage. From an ATT&CK framework perspective, this vulnerability maps to techniques including T1059 for command and scripting interpreter and T1078 for valid accounts, as attackers could leverage compromised Teams sessions to maintain persistence and escalate privileges. The attack chain typically involves initial compromise through social engineering or phishing campaigns, followed by exploitation of the remote code execution vulnerability to establish a foothold within the target environment.
Mitigation strategies should focus on immediate patch management and operational security enhancements to protect against exploitation attempts. Organizations must prioritize deployment of Microsoft's security updates and patches addressing the identified vulnerability, while implementing network segmentation to limit lateral movement capabilities. Security teams should monitor for anomalous Teams usage patterns and implement enhanced logging to detect potential exploitation attempts. Additional protective measures include restricting file sharing permissions, implementing application control policies, and conducting regular security assessments of Teams configurations. Network-based detection solutions should be configured to monitor for suspicious data flows related to Teams communications, while endpoint protection mechanisms should be enhanced to detect and block malicious code execution attempts. The implementation of zero-trust security principles within Teams environments can help minimize the impact of potential compromises, ensuring that even if one component is breached, lateral movement remains restricted. Regular security awareness training for users can reduce the likelihood of initial compromise through social engineering attacks that often precede remote code execution exploitation attempts.