CVE-2024-23534 is an unrestricted file upload vulnerability classified under CWE-434, affecting the web component of Ivanti Avalanche versions before 6.4.3. Ivanti Avalanche is a widely used endpoint management and patching solution. The vulnerability allows a remote attacker who has authenticated access to the web interface to upload arbitrary files without proper validation or restrictions. This can lead to execution of arbitrary commands with SYSTEM privileges, effectively granting full control over the affected system. The CVSS v3.0 score of 8.8 reflects the high impact on confidentiality, integrity, and availability, with low attack complexity and no user interaction required beyond authentication. The vulnerability arises from insufficient input validation on file uploads, enabling attackers to bypass security controls and deploy malicious payloads. Although no public exploits are currently known, the potential for severe damage is significant, especially in environments where Ivanti Avalanche manages critical endpoints. The vulnerability underscores the importance of secure file handling and strict access controls in web-based management tools.

For European organizations, exploitation of CVE-2024-23534 could lead to complete compromise of systems managed by Ivanti Avalanche, including unauthorized access to sensitive data, disruption of endpoint management processes, and potential lateral movement within networks. This could severely impact confidentiality, integrity, and availability of IT infrastructure, especially in sectors such as finance, healthcare, government, and critical infrastructure where Ivanti Avalanche is commonly deployed. The SYSTEM-level execution capability means attackers can disable security controls, deploy ransomware, or exfiltrate data. Given the centralized role of Ivanti Avalanche in patch management, exploitation could delay or prevent deployment of security updates, compounding risk. The absence of known exploits in the wild provides a window for proactive mitigation, but the high severity demands urgent attention to prevent targeted attacks.

1. Immediately upgrade Ivanti Avalanche installations to version 6.4.3 or later, where the vulnerability is patched. 2. Restrict access to the Ivanti Avalanche web interface using network segmentation, VPNs, or IP whitelisting to limit exposure to authenticated users only. 3. Enforce strong authentication mechanisms, such as multi-factor authentication (MFA), to reduce risk of credential compromise. 4. Monitor web server logs and file upload directories for unusual or unauthorized file uploads and command execution attempts. 5. Implement application-layer firewalls or web application firewalls (WAFs) to detect and block malicious file upload attempts. 6. Regularly audit user accounts and permissions to ensure only authorized personnel have access to the management interface. 7. Conduct internal penetration testing and vulnerability scanning focused on Ivanti Avalanche deployments to identify residual risks. 8. Educate administrators on secure configuration and incident response procedures related to Ivanti Avalanche.