CVE-2023-38206: Adobe ColdFusion Auth Bypass Vulnerability

CVE-2023-38206 Overview

Adobe ColdFusion versions 2018u18 (and earlier), 2021u8 (and earlier) and 2023u2 (and earlier) are affected by an Improper Access Control vulnerability that could result in a security feature bypass. An attacker could leverage this vulnerability to access the administration CFM and CFC endpoints resulting in a low-confidentiality impact. Exploitation of this issue does not require user interaction.

Critical Impact

This vulnerability enables unauthorized access to ColdFusion administrative endpoints (CFM and CFC files), potentially exposing sensitive configuration and administrative functionality to unauthenticated attackers.

Affected Products

• Adobe ColdFusion 2018 Update 18 and earlier
• Adobe ColdFusion 2021 Update 8 and earlier
• Adobe ColdFusion 2023 Update 2 and earlier

Discovery Timeline

• 2023-09-14 - CVE-2023-38206 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-38206

Vulnerability Analysis

This vulnerability falls under the category of Improper Access Control (CWE-284), which occurs when an application does not properly restrict access to sensitive resources or functionality. In the case of CVE-2023-38206, Adobe ColdFusion fails to adequately enforce access controls on administrative endpoints, specifically CFM (ColdFusion Markup) and CFC (ColdFusion Component) files used for administration purposes.

The vulnerability allows remote attackers to bypass security features designed to protect administrative interfaces. While the impact is categorized as low-confidentiality, the ability to access administrative endpoints without proper authorization could provide attackers with valuable reconnaissance information about the ColdFusion installation, configuration details, and potentially expose additional attack surfaces.

Root Cause

The root cause of this vulnerability stems from insufficient access control validation within Adobe ColdFusion's request handling mechanism. The application fails to properly verify authorization before granting access to sensitive administrative CFM and CFC endpoints. This represents a fundamental flaw in the security architecture where authentication or authorization checks are either missing or can be circumvented.

Attack Vector

The attack vector for this vulnerability is network-based, meaning attackers can exploit it remotely without requiring any user interaction or prior authentication. An attacker would need network access to a vulnerable ColdFusion server and could directly request administrative endpoints that should normally be protected. The exploitation is relatively straightforward, requiring no special privileges or complex attack chains.

The vulnerability can be exploited by crafting HTTP requests to specific administrative CFM and CFC endpoints. Due to the improper access controls, these requests may bypass authentication mechanisms and return information or functionality that should be restricted to authenticated administrators. For detailed technical information, refer to the Adobe ColdFusion Security Advisory.

Detection Methods for CVE-2023-38206

Indicators of Compromise

• Unusual HTTP requests targeting ColdFusion administrative paths such as /CFIDE/administrator/ or custom CFC endpoints
• Access log entries showing requests to sensitive CFM/CFC files from external or unauthorized IP addresses
• Multiple requests to administrative endpoints without corresponding authentication events
• Unexpected access patterns to ColdFusion component files during non-business hours

Detection Strategies

• Implement web application firewall (WAF) rules to monitor and alert on requests to ColdFusion administrative endpoints from unauthorized sources
• Configure SIEM rules to correlate access attempts to /CFIDE/ directories with authentication logs to identify bypass attempts
• Deploy intrusion detection signatures for ColdFusion administrative endpoint access patterns
• Enable detailed access logging on ColdFusion servers and review logs for anomalous administrative endpoint requests

Monitoring Recommendations

• Monitor all HTTP/HTTPS traffic to ColdFusion servers for requests targeting administrative CFM and CFC files
• Implement network segmentation alerts for any traffic attempting to reach ColdFusion administrative interfaces from untrusted network zones
• Set up real-time alerting for any successful responses (HTTP 200) to administrative endpoints from non-whitelisted IP addresses
• Regularly audit ColdFusion access logs for patterns indicating reconnaissance or exploitation attempts

How to Mitigate CVE-2023-38206

Immediate Actions Required

• Update Adobe ColdFusion 2018 to Update 19 or later immediately
• Update Adobe ColdFusion 2021 to Update 9 or later immediately
• Update Adobe ColdFusion 2023 to Update 3 or later immediately
• Restrict network access to ColdFusion administrative endpoints using firewall rules or network segmentation

Patch Information

Adobe has released security patches addressing this vulnerability in bulletin APSB23-47. Organizations should apply the appropriate update for their ColdFusion version:

• ColdFusion 2018: Update to Update 19 or later
• ColdFusion 2021: Update to Update 9 or later
• ColdFusion 2023: Update to Update 3 or later

For complete patch details and download links, refer to the Adobe ColdFusion Security Advisory.

Workarounds

• Implement IP whitelisting at the web server or firewall level to restrict access to ColdFusion administrative directories (/CFIDE/administrator/, /CFIDE/adminapi/)
• Use a reverse proxy to block external access to sensitive ColdFusion endpoints while allowing legitimate internal administrative access
• Disable or remove unnecessary administrative components if they are not required for operations
• Implement additional authentication layers (such as VPN requirements) for accessing ColdFusion administration

# Example Apache configuration to restrict CFIDE access
<Location "/CFIDE/administrator">
    Order deny,allow
    Deny from all
    Allow from 10.0.0.0/8
    Allow from 192.168.0.0/16
</Location>

<Location "/CFIDE/adminapi">
    Order deny,allow
    Deny from all
    Allow from 10.0.0.0/8
    Allow from 192.168.0.0/16
</Location>