CVE-2024-54662 Overview
CVE-2024-54662 is a critical access control vulnerability affecting Dante, a widely-used SOCKS proxy implementation. The vulnerability exists in Dante versions 1.4.0 through 1.4.3 and has been fixed in version 1.4.4. The flaw stems from incorrect access control enforcement in certain sockd.conf configurations involving the socksmethod directive, potentially allowing unauthorized network access through the proxy server.
Critical Impact
Attackers can exploit misconfigured Dante proxy servers to bypass authentication and access control mechanisms, potentially gaining unauthorized network access with high confidentiality and integrity impact.
Affected Products
- Dante versions 1.4.0 through 1.4.3
- Systems running vulnerable Dante SOCKS proxy configurations
- Network environments relying on socksmethod authentication in sockd.conf
Discovery Timeline
- 2024-12-16 - Inet releases security advisory detailing the vulnerability
- 2024-12-17 - CVE-2024-54662 published to NVD
- 2024-12-18 - Last updated in NVD database
Technical Details for CVE-2024-54662
Vulnerability Analysis
This vulnerability is classified under CWE-863 (Incorrect Authorization), indicating that the Dante SOCKS proxy fails to properly enforce access control policies under specific configuration scenarios. When certain socksmethod settings are configured in sockd.conf, the proxy incorrectly processes authorization checks, allowing connections that should otherwise be denied.
The network-accessible nature of this vulnerability means attackers can exploit it remotely without requiring authentication or user interaction. Successful exploitation can result in unauthorized access to protected network resources and the ability to modify or intercept network traffic passing through the compromised proxy.
Root Cause
The root cause lies in the improper handling of authentication method configurations within the Dante daemon (sockd). When specific combinations of socksmethod directives are present in the configuration file, the access control logic fails to correctly validate client permissions, creating a bypass condition. This represents a flaw in the authorization decision-making process that should restrict connections based on the configured authentication requirements.
Attack Vector
The attack vector is network-based, requiring the attacker to have network access to the vulnerable Dante proxy server. Exploitation does not require authentication, privileges, or user interaction. An attacker can craft SOCKS connection requests that exploit the misconfigured access control logic, bypassing the intended authentication requirements and gaining unauthorized proxy access.
The vulnerability specifically affects configurations where socksmethod is used to define authentication requirements. When the authorization checks are bypassed, attackers can utilize the proxy to:
- Access internal network resources that should be protected
- Route malicious traffic through the compromised proxy
- Potentially intercept or modify data passing through the proxy
Detection Methods for CVE-2024-54662
Indicators of Compromise
- Unexpected or unauthorized SOCKS connections originating from external sources
- Unusual traffic patterns through the Dante proxy from unrecognized clients
- Authentication bypass attempts visible in proxy logs when authentication should be required
Detection Strategies
- Review sockd.conf configuration files for vulnerable socksmethod configurations
- Monitor Dante proxy logs for connections that bypass expected authentication mechanisms
- Implement network monitoring to detect anomalous proxy usage patterns
- Conduct configuration audits to identify affected Dante installations
Monitoring Recommendations
- Enable verbose logging in Dante to capture connection authentication details
- Implement alerting for connections from unexpected source IP addresses
- Monitor for sudden increases in proxy traffic volume that may indicate exploitation
- Deploy network intrusion detection signatures for SOCKS protocol anomalies
How to Mitigate CVE-2024-54662
Immediate Actions Required
- Upgrade Dante to version 1.4.4 or later immediately
- Review and audit all sockd.conf configurations for socksmethod directives
- Restrict network access to Dante proxy servers using firewall rules
- Monitor proxy logs for signs of unauthorized access
Patch Information
Inet has released Dante version 1.4.4 which addresses this access control vulnerability. Organizations should upgrade to this patched version as soon as possible. The official security advisory is available at the Inet Security Advisory 2024-12-16 page. Additional product documentation can be found at the Dante Proxy Documentation site.
Workarounds
- Implement network-level access controls (firewalls, ACLs) to restrict who can connect to the Dante proxy
- Review and strengthen socksmethod configurations to ensure proper authentication is enforced
- Consider temporarily disabling the Dante proxy if immediate patching is not possible
- Deploy additional authentication layers such as VPN requirements for proxy access
# Verify Dante version and upgrade if vulnerable
sockd -v
# If version shows 1.4.0-1.4.3, upgrade immediately
# Restrict proxy access at the firewall level
iptables -A INPUT -p tcp --dport 1080 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 1080 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
