CVE-2024-13181: Ivanti Avalanche Auth Bypass Vulnerability

CVE-2024-13181 Overview

CVE-2024-13181 is a critical path traversal vulnerability affecting Ivanti Avalanche, an enterprise mobile device management (MDM) solution. This vulnerability allows a remote unauthenticated attacker to bypass authentication mechanisms through specially crafted path traversal sequences. Notably, this CVE addresses incomplete fixes from the previously disclosed CVE-2024-47010, indicating that the original patch did not fully remediate the underlying security issue.

Critical Impact

Unauthenticated remote attackers can bypass authentication controls through path traversal, potentially gaining unauthorized access to sensitive enterprise systems and managed mobile device infrastructure.

Affected Products

• Ivanti Avalanche versions prior to 6.4.7

Discovery Timeline

• 2025-01-14 - CVE-2024-13181 published to NVD
• 2025-01-16 - Last updated in NVD database

Technical Details for CVE-2024-13181

Vulnerability Analysis

This path traversal vulnerability (CWE-22) exists in Ivanti Avalanche's authentication handling mechanism. The flaw allows attackers to manipulate file paths or URLs to traverse outside the intended directory structure, effectively bypassing authentication controls. This vulnerability is particularly concerning as it represents an incomplete fix for the earlier CVE-2024-47010, suggesting that the original mitigation was insufficient to fully address the attack surface.

Path traversal vulnerabilities occur when an application uses user-supplied input to construct file paths without proper sanitization. In this case, the vulnerability enables authentication bypass, meaning attackers can gain access to protected resources without providing valid credentials.

Root Cause

The root cause stems from improper input validation and sanitization of path components within Ivanti Avalanche's authentication workflow. The application fails to adequately neutralize special characters and directory traversal sequences (such as ../ or ..\) in user-controlled input, allowing attackers to navigate outside intended directory boundaries. The incomplete nature of the previous fix (CVE-2024-47010) suggests that certain edge cases or encoding variations were not addressed in the original patch.

Attack Vector

The attack is network-based and requires no authentication or user interaction, making it highly exploitable. An attacker can remotely send specially crafted HTTP requests containing path traversal sequences to the Ivanti Avalanche server. By manipulating path parameters, the attacker can bypass authentication checks and access protected functionality or sensitive data.

The attack flow typically involves:

1. An attacker identifies an Ivanti Avalanche instance exposed to the network
2. Crafted requests containing path traversal sequences (e.g., ../, URL-encoded variants like %2e%2e%2f, or double-encoding) are sent to the target
3. The application fails to properly sanitize these sequences, allowing authentication bypass
4. The attacker gains unauthorized access to protected resources

For detailed technical information, refer to the Ivanti Security Advisory.

Detection Methods for CVE-2024-13181

Indicators of Compromise

• HTTP requests containing path traversal sequences such as ../, ..\, %2e%2e%2f, %2e%2e/, or ..%2f targeting Ivanti Avalanche endpoints
• Unusual access patterns to authentication endpoints from external IP addresses
• Log entries showing successful authentication events without corresponding valid credential submissions
• Unexpected access to administrative or protected functionality from unauthenticated sessions

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing path traversal patterns and their encoded variants
• Monitor Ivanti Avalanche access logs for suspicious patterns including multiple failed authentication attempts followed by successful access
• Deploy network intrusion detection systems (IDS) with signatures for path traversal exploitation attempts
• Conduct regular vulnerability scans to identify unpatched Ivanti Avalanche instances in your environment

Monitoring Recommendations

• Enable verbose logging on Ivanti Avalanche servers and forward logs to a centralized SIEM platform for correlation analysis
• Set up alerts for authentication bypass indicators such as access to protected resources without corresponding authentication events
• Monitor network traffic to Ivanti Avalanche services for anomalous request patterns or unusual payload characteristics
• Review audit logs regularly for evidence of unauthorized access or privilege escalation

How to Mitigate CVE-2024-13181

Immediate Actions Required

• Upgrade Ivanti Avalanche to version 6.4.7 or later immediately to address this critical vulnerability
• If immediate patching is not possible, restrict network access to Ivanti Avalanche servers to trusted IP ranges only
• Place Ivanti Avalanche behind a reverse proxy or WAF configured to block path traversal attempts
• Review access logs for evidence of exploitation prior to patching

Patch Information

Ivanti has released version 6.4.7 of Avalanche which addresses this vulnerability along with multiple other security issues. Organizations should prioritize upgrading to this version as the vulnerability requires no authentication and can be exploited remotely. Detailed patch information is available in the Ivanti Security Advisory for Avalanche 6.4.7.

Workarounds

• Implement network segmentation to limit exposure of Ivanti Avalanche servers to only authorized internal networks
• Deploy a web application firewall (WAF) with rules to detect and block path traversal sequences including encoded variants
• Restrict access to Ivanti Avalanche administrative interfaces via IP allowlisting or VPN requirements
• Disable or limit external network access to Ivanti Avalanche services until patching can be completed

# Example: Restrict access to Ivanti Avalanche using iptables
# Allow only trusted management subnet
iptables -A INPUT -p tcp --dport 443 -s 10.0.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP