CVE-2024-38652: Ivanti Avalanche Path Traversal Vulnerability

CVE-2024-38652 Overview

CVE-2024-38652 is a critical path traversal vulnerability affecting the skin management component of Ivanti Avalanche, a widely deployed enterprise mobility management solution. This vulnerability allows remote unauthenticated attackers to perform arbitrary file deletion operations on affected systems, potentially leading to complete denial of service or system compromise.

The flaw exists in how the skin management component processes file paths, failing to properly sanitize user-supplied input. By crafting malicious requests containing path traversal sequences (such as ../), attackers can escape the intended directory structure and delete arbitrary files on the target system without requiring any authentication.

Critical Impact

Remote unauthenticated attackers can delete arbitrary files on Ivanti Avalanche servers, potentially causing complete system unavailability and data loss. This vulnerability requires no user interaction and can be exploited over the network.

Affected Products

• Ivanti Avalanche 6.3.1 through 6.3.1.1507 (Premise)
• Ivanti Avalanche 6.3.2 through 6.3.4.153 (Premise and Windows)
• Ivanti Avalanche 6.4.0 through 6.4.2 (Premise)

Discovery Timeline

• August 14, 2024 - CVE-2024-38652 published to NVD
• August 15, 2024 - Last updated in NVD database

Technical Details for CVE-2024-38652

Vulnerability Analysis

This path traversal vulnerability (CWE-22) resides in the skin management component of Ivanti Avalanche. The vulnerability enables attackers to manipulate file paths used by the application, bypassing directory restrictions to access and delete files outside the intended web directory. Because the vulnerability can be exploited without authentication, it presents a significant attack surface for organizations using affected versions of Ivanti Avalanche.

The vulnerability allows for high-impact integrity and availability violations. An attacker can delete critical system files, configuration files, or database components, effectively rendering the Avalanche server inoperable. In enterprise environments where Ivanti Avalanche manages large fleets of mobile devices, exploitation could disrupt device management capabilities across the entire organization.

Root Cause

The root cause of this vulnerability is improper input validation in the skin management component. The application fails to adequately sanitize user-supplied file path parameters before using them in file system operations. Specifically, the component does not properly filter or reject path traversal sequences such as ../ or ..\\, allowing attackers to construct paths that reference files outside the intended directory scope.

This type of vulnerability typically occurs when:

• User input is directly concatenated into file system paths
• Path canonicalization is not performed before file operations
• Directory access restrictions are not properly enforced at the application level

Attack Vector

The attack can be executed remotely over the network without requiring authentication or user interaction. An attacker sends specially crafted HTTP requests to the skin management component of the Ivanti Avalanche server. These requests contain path traversal sequences in parameters that specify file locations.

When the application processes these malicious requests, it performs file deletion operations using the attacker-controlled path. By carefully constructing the traversal sequences, the attacker can target critical system files, application configuration files, or database files, leading to denial of service conditions.

The attack does not require valid credentials, making it particularly dangerous for internet-exposed Avalanche servers. Any system accessible over the network is potentially vulnerable to exploitation.

Detection Methods for CVE-2024-38652

Indicators of Compromise

• HTTP requests to the skin management component containing path traversal sequences (../, ..\\, or URL-encoded variants like %2e%2e%2f)
• Unexpected file deletion events in system or application directories
• Audit log entries showing access to files outside the Avalanche web directory
• Missing or corrupted configuration files, database files, or system binaries

Detection Strategies

• Monitor web server access logs for requests containing path traversal patterns targeting the skin management component
• Implement intrusion detection rules to alert on HTTP requests with directory traversal sequences in parameters
• Deploy file integrity monitoring on critical system and application directories to detect unauthorized deletions
• Configure web application firewall (WAF) rules to block requests containing path traversal payloads

Monitoring Recommendations

• Enable verbose logging for the Ivanti Avalanche web service and retain logs for forensic analysis
• Monitor file system audit logs for deletion events in system directories, particularly those outside the Avalanche installation path
• Implement real-time alerting for any failed or successful file operations that reference parent directory sequences
• Review network traffic for unusual patterns of requests to the skin management endpoints

How to Mitigate CVE-2024-38652

Immediate Actions Required

• Upgrade Ivanti Avalanche to version 6.4.4 or later immediately
• Restrict network access to Ivanti Avalanche servers to only authorized management workstations
• Review system file integrity to identify any files that may have been deleted through exploitation
• Implement network segmentation to limit exposure of the Avalanche management interface

Patch Information

Ivanti has released version 6.4.4 of Avalanche to address this vulnerability along with several other security issues. Organizations should apply this update as soon as possible. The security advisory detailing the patch is available on the Ivanti Security Advisory.

Before applying the patch, administrators should:

• Back up the current Avalanche configuration and database
• Schedule maintenance window to minimize operational impact
• Test the update in a non-production environment if possible
• Verify file integrity after upgrade completion

Workarounds

• Place Ivanti Avalanche servers behind a reverse proxy or web application firewall configured to block path traversal attempts
• Restrict access to the skin management component through network access control lists (ACLs)
• Implement IP whitelisting to allow only authorized administrator IP addresses to access the management interface
• If the skin management feature is not required, consider disabling it until the patch can be applied

# Example: Restrict access to Avalanche management interface via firewall
# Allow only specific management network to access Avalanche (example using iptables)
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP