CVE-2024-3826

Executive Summary

CVE-2024-3826 is a critical security advisory affecting Akana API management platform versions up to and including 2022.1.3. The vulnerability resides in the SAML Single Sign-On (SSO) functionality, where validation logic is broken, potentially allowing an attacker to bypass authentication or forge SAML assertions. This could lead to unauthorized access to protected resources, privilege escalation, or lateral movement within the API ecosystem. No CVSS score, EPSS data, or public exploit code has been released, but the lack of a patch from the vendor elevates the risk for organizations relying on this platform.

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (No official vector assigned)
• EPSS Score: 0.0% (Low exploitation probability currently)
• Threat Level: High (due to authentication bypass potential and unpatched status)
• Attack Vector: Network (SAML SSO endpoint)
• Attack Complexity: Low (broken validation suggests simple manipulation)
• Privileges Required: None (SSO bypass)
• User Interaction: None
• Impact: Confidentiality, Integrity, and Availability could be compromised

Deep Dive & Mechanics

The vulnerability stems from improper validation of SAML assertions within the Akana SSO module. SAML (Security Assertion Markup Language) is used for federated identity; a broken validation means the system fails to correctly verify the authenticity, integrity, or expiration of SAML tokens. An attacker could craft a malicious SAML response with forged attributes (e.g., user roles, email) or reuse a valid assertion outside its intended context. The exact flaw is not publicly detailed, but common SAML issues include:

• Signature Wrapping: XML signature manipulation to bypass verification.
• Assertion Replay: Reusing a captured SAML response.
• Missing Audience/Restriction Checks: Allowing tokens intended for one service to be used on another.
• Weak Cryptographic Validation: Accepting self-signed or unsigned assertions.

Given the lack of patch, the vulnerability likely affects the core SAML processing library or configuration defaults.

Vulnerable vs. Patched Code

No official patch exists. However, based on typical SAML fixes, the vulnerable code might look like:

Vulnerable (pseudo-code):

def validate_saml_assertion(assertion):
    # Missing signature verification
    if assertion.issuer == "trusted_idp":
        return extract_attributes(assertion)
    return None

Patched (hypothetical):

def validate_saml_assertion(assertion):
    # Verify signature using trusted certificate
    if not verify_signature(assertion, trusted_cert):
        raise InvalidAssertion("Signature mismatch")
    # Check audience and conditions
    if not check_audience(assertion, service_url):
        raise InvalidAssertion("Audience mismatch")
    if not check_conditions(assertion):
        raise InvalidAssertion("Assertion expired or invalid")
    return extract_attributes(assertion)

Exploitation & Lab Setup

Red Team (Offensive)

Lab Setup:

• Deploy Akana 2022.1.3 in a controlled environment.
• Configure SAML SSO with a test Identity Provider (e.g., SimpleSAMLphp).
• Use a proxy (Burp Suite) to intercept SAML responses.

Exploitation Steps:

1. Capture a valid SAML response during authentication.
2. Modify the assertion attributes (e.g., change role to admin).
3. Replay the modified assertion to the Akana ACS (Assertion Consumer Service) endpoint.
4. If validation is broken, the system accepts the forged attributes.

Example SAML modification (using Burp):

<saml:Attribute Name="role">
  <saml:AttributeValue>admin</saml:AttributeValue>
</saml:Attribute>

Blue Team (Defensive)

Detection:

• Monitor for unusual SAML assertion patterns (e.g., multiple assertions from same IP).
• Alert on SAML responses with mismatched Audience or Issuer.
• Log all SAML authentication attempts and correlate with user behavior.

Mitigation:

• Disable SAML SSO if not critical.
• Implement additional validation at the application layer (e.g., check user roles against a whitelist).
• Use Web Application Firewall (WAF) rules to block malformed SAML requests.

Indicators of Compromise (IOCs)

• Network: Unusual SAML responses with modified Attribute elements.
• Logs: SAML assertion validation failed or Invalid signature errors (if logging is enabled).
• Files: Modified SAML configuration files (e.g., saml_config.xml).
• Authentication: Successful logins from unexpected IPs or with elevated privileges.

Detection Engineering

YARA Rule

rule CVE_2024_3826_SAML_Exploit {
    meta:
        description = "Detects SAML responses with potential signature bypass or attribute manipulation"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-3826"
    strings:
        $saml_response = "<samlp:Response"
        $modified_role = "<saml:AttributeValue>admin</saml:AttributeValue>"
        $unsigned = "SignatureValue" nocase
    condition:
        $saml_response and (#modified_role > 1) and not $unsigned
}

Sigma Rule

title: Suspicious SAML Authentication Attempt
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects potential SAML assertion manipulation targeting Akana SSO
logsource:
    category: application
    product: akana
detection:
    selection:
        EventID: 4624  # Successful logon
        LogonType: 3   # Network
        AuthenticationPackage: SAML
    condition: selection
falsepositives:
    - Legitimate SAML SSO usage
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-3826 - Akana SAML SSO Bypass Attempt"; flow:to_server; content:"POST"; http_method; content:"/saml/acs"; http_uri; content:"<samlp:Response"; within:100; pcre:"/<saml:AttributeValue>[^<]+<\/saml:AttributeValue>/i"; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate: Disable SAML SSO functionality if not required.
2. Workaround: Implement additional validation at the reverse proxy or WAF to inspect SAML assertions.
3. Upgrade: Monitor Akana for a patched version (2022.1.4 or later). If unavailable, consider migrating to a supported API management platform.
4. Monitoring: Enable detailed logging for SAML endpoints and alert on anomalies.
5. Compensating Controls: Use network segmentation to limit access to Akana servers.

Valters IT
DevSecOps & Cyber Threat Intelligence
Report generated for CVE-2024-3826