CVE-2024-23534 is an unrestricted file upload vulnerability identified in the web component of Ivanti Avalanche, a widely used endpoint management and patch deployment solution. The flaw exists in versions before 6.4.3 and allows a remote attacker with valid authentication to upload arbitrary files without proper validation or restriction. This can lead to execution of arbitrary commands with SYSTEM-level privileges on the underlying server hosting the Avalanche web interface. The vulnerability is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) and has a CVSS v3.0 score of 8.8, indicating high severity. The attack vector is network-based (AV:N), requires low attack complexity (AC:L), and only requires privileges (PR:L) but no user interaction (UI:N). Successful exploitation compromises confidentiality, integrity, and availability, enabling attackers to potentially take full control of the Avalanche server, manipulate endpoint management tasks, deploy malicious payloads, or disrupt operations. No public exploits have been reported yet, but the vulnerability's nature and impact make it a critical concern for organizations using Ivanti Avalanche. The vendor has released version 6.4.3 to address this issue, though no direct patch links were provided in the source data.

For European organizations, the impact of CVE-2024-23534 can be severe. Ivanti Avalanche is often used in enterprise environments for centralized patch management, software distribution, and endpoint configuration. Compromise of the Avalanche server can lead to widespread unauthorized command execution, potentially affecting thousands of managed endpoints. This could result in data breaches, disruption of IT operations, deployment of ransomware or other malware, and loss of control over critical infrastructure. Sectors such as finance, healthcare, government, and critical infrastructure operators in Europe are particularly vulnerable due to their reliance on endpoint management solutions and the sensitive nature of their data. The SYSTEM-level access granted by this vulnerability means attackers can bypass most security controls on the server, making detection and remediation more difficult. Additionally, the vulnerability could be leveraged for lateral movement within networks, increasing the scope of impact.

1. Immediately upgrade Ivanti Avalanche to version 6.4.3 or later, which contains the fix for this vulnerability. 2. Restrict access to the Avalanche web interface to trusted administrators only, ideally via VPN or secure network segments. 3. Implement strong multi-factor authentication (MFA) for all users with access to the Avalanche management console to reduce the risk of credential compromise. 4. Monitor web server logs and endpoint management activity for unusual file uploads or command execution patterns indicative of exploitation attempts. 5. Employ network segmentation to isolate the Avalanche server from critical production systems to limit lateral movement. 6. Conduct regular security audits and vulnerability scans on the Avalanche environment to detect misconfigurations or residual risks. 7. Educate administrators on secure file upload handling and the risks of unrestricted uploads. 8. Consider deploying application-layer firewalls or web application firewalls (WAFs) with rules to detect and block suspicious file uploads targeting the Avalanche web interface.