CVE-2024-41570: Havocframework Havoc SSRF Vulnerability

CVE-2024-41570 Overview

CVE-2024-41570 is an unauthenticated Server-Side Request Forgery (SSRF) vulnerability affecting the demon callback handling functionality in Havoc C2 Framework version 0.7. This vulnerability allows attackers to send arbitrary network traffic originating from the team server without requiring any authentication, potentially enabling internal network reconnaissance, data exfiltration, and attacks on backend systems.

Critical Impact

Unauthenticated attackers can leverage the Havoc team server to send arbitrary network requests, potentially accessing internal services, cloud metadata endpoints, and other protected resources that trust the team server's network position.

Affected Products

• Havocframework Havoc version 0.7
• Havocframework Havoc (all versions prior to patched releases)

Discovery Timeline

• 2024-08-12 - CVE-2024-41570 published to NVD
• 2024-08-29 - Last updated in NVD database

Technical Details for CVE-2024-41570

Vulnerability Analysis

This Server-Side Request Forgery vulnerability exists in the demon callback handling mechanism of Havoc C2 Framework. The vulnerability stems from insufficient validation of user-controlled input in the callback handling process, allowing attackers to craft malicious requests that the team server will forward to arbitrary destinations. This is classified under CWE-918 (Server-Side Request Forgery).

The critical nature of this vulnerability is compounded by the fact that Havoc is a command-and-control framework typically deployed within security-sensitive environments. An attacker exploiting this vulnerability could leverage the team server's network position to access internal resources, cloud metadata services (such as AWS 169.254.169.254), or other services that would normally be inaccessible from external networks.

Root Cause

The root cause of CVE-2024-41570 lies in the demon callback handling code within Havoc's team server component. The application fails to properly validate and sanitize URLs or network destinations specified in demon callback requests before processing them. This allows an unauthenticated attacker to manipulate the callback mechanism to make arbitrary HTTP requests on behalf of the team server.

The lack of authentication on the vulnerable endpoint further exacerbates the issue, as any network-accessible attacker can exploit this vulnerability without needing valid credentials or prior access to the Havoc deployment.

Attack Vector

The attack is network-based and requires no user interaction or authentication. An attacker can exploit this vulnerability by sending specially crafted requests to the Havoc team server's demon callback endpoint. The server will then process these requests and make outbound connections to attacker-specified destinations.

The vulnerability can be exploited to:

• Access internal network services not exposed to the internet
• Query cloud metadata endpoints to steal credentials and configuration
• Scan internal networks for additional attack surfaces
• Bypass firewall restrictions by using the team server as a proxy
• Potentially achieve remote code execution on internal systems

For detailed technical analysis of this vulnerability, refer to the Chebuya Blog SSRF Analysis.

Detection Methods for CVE-2024-41570

Indicators of Compromise

• Unexpected outbound HTTP/HTTPS connections from the Havoc team server to internal IP ranges or cloud metadata endpoints
• Network traffic from the team server to 169.254.169.254 (AWS metadata) or similar cloud provider metadata IPs
• Unusual callback request patterns in Havoc team server logs showing malformed or external URLs
• DNS queries from the team server for internal hostnames or unexpected external domains

Detection Strategies

• Monitor network traffic originating from Havoc team server instances for connections to internal services or cloud metadata endpoints
• Implement network segmentation to restrict the team server's ability to reach sensitive internal resources
• Deploy intrusion detection signatures to identify SSRF exploitation patterns targeting the demon callback endpoint
• Review team server logs for anomalous callback requests that reference internal IP addresses or localhost

Monitoring Recommendations

• Configure alerting for any outbound connections from the team server to RFC 1918 private address spaces
• Establish baseline network behavior for team server communications and alert on deviations
• Monitor for DNS lookups to cloud metadata hostnames from the team server
• Implement egress filtering and logging to track all outbound connections from security infrastructure

How to Mitigate CVE-2024-41570

Immediate Actions Required

• Restrict network access to the Havoc team server to only trusted operator IP addresses using firewall rules
• Implement network segmentation to limit the team server's ability to reach internal services
• Deploy a web application firewall (WAF) in front of the team server to filter malicious callback requests
• Consider taking the vulnerable Havoc deployment offline until a patched version is available

Patch Information

As of the last NVD update on 2024-08-29, users should consult the official Havocframework repository and community channels for security updates addressing this vulnerability. Organizations using Havoc should monitor for official patches and apply them immediately when available.

Workarounds

• Implement strict egress firewall rules on the team server to only allow connections to expected destinations
• Deploy the team server in an isolated network segment with no access to sensitive internal resources
• Use a reverse proxy with request filtering to inspect and validate incoming callback requests before they reach the team server
• Block access to cloud metadata endpoints (e.g., 169.254.169.254) from the team server network

# Example iptables rules to restrict team server egress traffic
# Block access to cloud metadata endpoints
iptables -A OUTPUT -d 169.254.169.254 -j DROP

# Block access to internal network ranges (adjust as needed)
iptables -A OUTPUT -d 10.0.0.0/8 -j DROP
iptables -A OUTPUT -d 172.16.0.0/12 -j DROP
iptables -A OUTPUT -d 192.168.0.0/16 -j DROP

# Allow only specific required outbound destinations
# iptables -A OUTPUT -d <allowed_ip> -j ACCEPT