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CVE-2019-12292

9.8 CRITICAL
Authentication Bypass

📋 TL;DR

CVE-2019-12292 is an incorrect access control vulnerability in Citrix AppDNA that allows attackers to bypass authentication and gain unauthorized access to the application. This affects all Citrix AppDNA installations before version 1906.1.0.472. Attackers could potentially take full control of affected systems.

💻 Affected Systems

Products:
  • Citrix AppDNA
Versions: All versions before 1906.1.0.472
Operating Systems: Windows
Default Config Vulnerable: ⚠️ Yes
Notes: All AppDNA installations with default configurations are vulnerable. No special configuration required for exploitation.

📦 What is this software?

Appdna by Citrix

View all CVEs affecting Appdna →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete system compromise allowing attackers to execute arbitrary code, steal sensitive data, and pivot to other network resources.

🟠

Likely Case

Unauthorized access to AppDNA functionality leading to data theft, configuration changes, and potential privilege escalation.

🟢

If Mitigated

Limited impact with proper network segmentation and access controls, though authentication bypass remains possible.

🌐 Internet-Facing: HIGH - If exposed to the internet, attackers can easily exploit this without authentication.
🏢 Internal Only: HIGH - Even internally, any network-accessible instance is vulnerable to authenticated users or attackers who gain internal access.

🎯 Exploit Status

Public PoC: ✅ No
Weaponized: LIKELY
Unauthenticated Exploit: ⚠️ Yes
Complexity: LOW

The vulnerability allows authentication bypass, making exploitation straightforward once the attack vector is identified.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 1906.1.0.472 or later

Vendor Advisory: https://support.citrix.com/article/CTX253828

Restart Required: Yes

Instructions:

1. Download AppDNA version 1906.1.0.472 or later from Citrix. 2. Backup current configuration and data. 3. Run the installer to upgrade. 4. Restart the AppDNA service. 5. Verify the new version is running.

🔧 Temporary Workarounds

Network Isolation

all

Restrict network access to AppDNA instances to only trusted IP addresses

Use firewall rules to limit access to AppDNA ports (default 80/443) to authorized IP ranges only

Authentication Proxy

all

Place AppDNA behind a reverse proxy with additional authentication

Configure Apache/Nginx/IIS as reverse proxy with additional authentication layer

🧯 If You Can't Patch

  • Implement strict network segmentation and firewall rules to limit AppDNA access
  • Deploy additional authentication mechanisms like VPN or web application firewall

🔍 How to Verify

Check if Vulnerable:

Check AppDNA version in the application interface or via registry: HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\AppDNA\Version

Check Version:

reg query "HKLM\SOFTWARE\Citrix\AppDNA" /v Version

Verify Fix Applied:

Verify version is 1906.1.0.472 or higher and test authentication bypass attempts fail

📡 Detection & Monitoring

Log Indicators:

  • Failed authentication attempts followed by successful access
  • Unusual access patterns to AppDNA endpoints
  • Access from unexpected IP addresses

Network Indicators:

  • Direct AppDNA access without authentication headers
  • Traffic to AppDNA from unauthorized networks

SIEM Query:

source="appdna.log" AND (event="authentication_failure" OR event="unauthorized_access")

📊 Metadata

CVE ID: CVE-2019-12292
CVSS v3 Score: 9.8 (CRITICAL)
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: June 24, 2019
Last Updated: November 21, 2024

🔗 References

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