CVE-2023-38205: Adobe ColdFusion Auth Bypass Vulnerability

CVE-2023-38205 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. Exploitation of this issue does not require user interaction.

Critical Impact

This vulnerability is actively exploited in the wild and has been added to the CISA Known Exploited Vulnerabilities (KEV) catalog. Attackers can bypass security controls to access administrative ColdFusion endpoints without authentication, potentially leading to complete system compromise.

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-2023-38205 published to NVD
• 2025-10-23 - Last updated in NVD database

Technical Details for CVE-2023-38205

Vulnerability Analysis

This vulnerability stems from improper access control mechanisms within Adobe ColdFusion's administrative interface. The flaw allows unauthenticated remote attackers to bypass security restrictions and access sensitive administration CFM (ColdFusion Markup) and CFC (ColdFusion Component) endpoints that should be protected. The vulnerability can be exploited over the network without any user interaction, making it particularly dangerous in internet-facing deployments.

ColdFusion's administrative interface contains functionality for server configuration, data source management, and code execution. When access controls are bypassed, attackers gain the ability to interact with these powerful administrative functions, potentially leading to arbitrary code execution, data exfiltration, or complete server takeover.

Root Cause

The root cause is classified as CWE-284: Improper Access Control. The vulnerability exists due to insufficient validation of access control checks on administrative endpoints. ColdFusion fails to properly verify that requests to sensitive CFM and CFC administrative files originate from authenticated administrators, allowing attackers to directly access these endpoints by crafting specific HTTP requests that circumvent the intended security mechanisms.

Attack Vector

The attack vector is network-based, requiring no authentication or user interaction. An attacker can exploit this vulnerability by sending specially crafted HTTP requests directly to vulnerable ColdFusion administrative endpoints. The attack flow typically involves:

1. Identifying a vulnerable ColdFusion server exposed to the network
2. Crafting HTTP requests targeting administrative CFM/CFC endpoints
3. Bypassing access control mechanisms through improper validation exploitation
4. Gaining access to administrative functionality for further exploitation

The vulnerability is particularly concerning because it can be chained with other ColdFusion vulnerabilities to achieve remote code execution.

Detection Methods for CVE-2023-38205

Indicators of Compromise

• Unexpected HTTP requests to ColdFusion administrative endpoints (e.g., /CFIDE/administrator/, /CFIDE/adminapi/)
• Unusual access patterns to .cfm and .cfc files within administrative directories
• Web server logs showing repeated attempts to access ColdFusion admin paths from external IP addresses
• Evidence of configuration changes or new scheduled tasks created without administrator knowledge

Detection Strategies

• Monitor web server access logs for requests to ColdFusion administrative endpoints from unauthorized sources
• Implement web application firewall (WAF) rules to detect and block suspicious requests targeting /CFIDE/ paths
• Deploy network intrusion detection systems with signatures for known ColdFusion exploitation patterns
• Review ColdFusion server logs for authentication bypass attempts or unexpected administrative actions

Monitoring Recommendations

• Enable verbose logging for ColdFusion administrative interface access attempts
• Configure SIEM alerts for access to sensitive ColdFusion endpoints from external networks
• Establish baselines for normal administrative access patterns and alert on deviations
• Implement real-time monitoring of ColdFusion process execution for suspicious child processes

How to Mitigate CVE-2023-38205

Immediate Actions Required

• Apply Adobe's security updates immediately: ColdFusion 2018 Update 19, ColdFusion 2021 Update 9, or ColdFusion 2023 Update 3
• Restrict network access to ColdFusion administrative interfaces using firewall rules
• Review server logs for signs of exploitation prior to patching
• Conduct a thorough security assessment of ColdFusion deployments for additional vulnerabilities

Patch Information

Adobe has released security updates to address this vulnerability in security bulletin APSB23-47. Organizations should update to the following versions:

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

This vulnerability is listed in the CISA Known Exploited Vulnerabilities Catalog, which mandates federal agencies to remediate within specified timeframes. All organizations are strongly encouraged to treat this as a priority remediation.

Workarounds

• Block external access to the /CFIDE/ and /cf_scripts/ directories at the web server or firewall level
• Implement IP-based access restrictions to allow only trusted administrator IP addresses to reach administrative endpoints
• Consider placing ColdFusion administrative interfaces behind a VPN or zero-trust network architecture
• Disable or remove unnecessary ColdFusion components and administrative features if not required

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