CVE-2024-34092

Executive Summary

CVE-2024-34092 is a critical authentication bypass vulnerability in Archer Platform versions prior to 2024.04 and 6.14 P3 (6.14.0.3). The flaw resides in the session management mechanism, where a user lockout action fails to terminate an existing authenticated session. This allows an attacker who has obtained a valid session token (e.g., via session hijacking, social engineering, or prior compromise) to continue accessing the application even after the legitimate user’s account has been locked. The vulnerability has a CVSS score of 0.0 in the NVD data, but based on the impact of session persistence and potential for privilege escalation, a more realistic CVSS vector is provided above. No public proof-of-concept (PoC) or exploit code is available at this time, but the risk is significant due to the potential for lateral movement and data exfiltration within Archer environments.

Supply Chain & Package Security

This vulnerability is not related to an open-source package (NPM, PyPI, Go, Ruby) but is a proprietary enterprise application (Archer Platform). Supply chain risk is limited to the software vendor’s update mechanism and the integrity of the patch distribution.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC): Low (L) – No special conditions are required; the attacker only needs a valid session token.
• Privileges Required (PR): None (N) – The attacker does not need to be authenticated to exploit the session persistence.
• User Interaction (UI): None (N) – No user action is required for exploitation.
• Scope (S): Unchanged (U) – The vulnerable component and the impacted component are the same.
• Confidentiality (C): High (H) – Full access to sensitive data within the session.
• Integrity (I): High (H) – The attacker can modify data or perform actions as the locked-out user.
• Availability (A): High (H) – The attacker could disrupt the application or lock out legitimate users.

Threat Level: Critical. The vulnerability allows an attacker to maintain unauthorized access even after account lockout, bypassing a primary security control.

Deep Dive & Mechanics

The Archer Platform uses a session-based authentication mechanism. When a user logs in, a session token is created and stored server-side. The lockout feature is designed to invalidate the user’s session and prevent further access. However, due to a flaw in the session management logic, the lockout action does not terminate the existing session. This means that if an attacker has already obtained a valid session token (e.g., through session fixation, cross-site scripting, or credential theft), they can continue to use that token even after the account is locked.

The root cause is likely a race condition or improper session invalidation in the authentication middleware. The lockout function may update the user’s status in the database but fails to clear the session cache or invalidate the token. This allows the attacker to maintain a persistent session until the token expires naturally (if at all).

Vulnerable vs. Patched Code

Vulnerable Code (Conceptual):

# Archer Platform < 2024.04
def lock_user(user_id):
    # Update user status in database
    db.execute("UPDATE users SET locked = 1 WHERE id = ?", user_id)
    # Session is NOT invalidated
    # Session token remains valid

Patched Code (Conceptual):

# Archer Platform 2024.04 / 6.14.0.3
def lock_user(user_id):
    # Update user status in database
    db.execute("UPDATE users SET locked = 1 WHERE id = ?", user_id)
    # Invalidate all sessions for the user
    session_store.invalidate_user_sessions(user_id)

The patch ensures that when a user is locked, all associated sessions are terminated immediately.

Exploitation & Lab Setup

Red Team

1. Prerequisites: Obtain a valid session token for a target user (e.g., via session hijacking, XSS, or credential theft).
2. Trigger Lockout: Cause the target user’s account to be locked (e.g., by repeatedly failing authentication or via social engineering).
3. Maintain Access: Use the stolen session token to continue accessing the Archer Platform. The lockout will not affect the existing session.
4. Lateral Movement: Use the persistent session to access sensitive data, modify configurations, or escalate privileges.

Lab Setup:

• Deploy Archer Platform version 6.14.0.0 (vulnerable).
• Create a test user and obtain a session token (e.g., via browser developer tools).
• Lock the user account via the admin interface.
• Use the session token in a tool like curl or Postman to access protected endpoints.

# Example: Using a stolen session token after lockout
curl -X GET "https://archer-instance/api/rest/records" \
  -H "Authorization: Bearer <stolen_token>"

Blue Team

1. Detection: Monitor for session tokens that remain active after account lockout events.
2. Hunting: Correlate lockout logs with session activity logs to identify anomalies.
3. Containment: Forcefully terminate all sessions for locked users via the admin interface (if available) or by restarting the application server.
4. Forensics: Collect logs of session creation, lockout events, and API access to identify the scope of compromise.

Indicators of Compromise (IOCs)

• Session Tokens: Tokens that remain valid after the associated user account has been locked.
• Log Entries: Lockout events (e.g., User locked: user123) followed by successful API calls using the same user’s session.
• Network Traffic: Repeated API requests from the same IP address using a session token that should have been invalidated.
• File Hashes: No specific file hashes; the vulnerability is in the application logic.

Detection Engineering

YARA Rule

rule CVE_2024_34092_Session_Persistence {
    meta:
        description = "Detect session tokens used after account lockout in Archer Platform logs"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-34092"
    strings:
        $lockout = /User locked: \w+/ nocase
        $session = /Session token: [A-Za-z0-9\-_]+/ nocase
    condition:
        #lockout and #session
}

Sigma Rule

title: Archer Platform Session Persistence After Lockout
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects session tokens used after account lockout in Archer Platform logs
author: Valters IT
logsource:
    product: archer
    service: authentication
detection:
    selection:
        EventID: 4625  # Failed logon (lockout trigger)
    condition: selection
    timeframe: 5m
falsepositives:
    - Legitimate session renewal before lockout
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2024-34092 - Archer Platform Session Persistence After Lockout";
    flow:to_server,established;
    content:"Authorization"; http_header;
    content:"Bearer"; distance:0;
    pcre:"/Bearer\s+[A-Za-z0-9\-_]{20,}/";
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

1. Immediate: Upgrade to Archer Platform 2024.04 or 6.14 P3 (6.14.0.3) as soon as possible.
2. Workaround: If patching is not immediately possible, implement additional session validation middleware that checks the user’s lock status on every request.
3. Compensating Controls: Enable multi-factor authentication (MFA) to reduce the risk of session token theft. Monitor for anomalous session activity.
4. Long-term: Review session management code for similar flaws. Implement automated testing for session invalidation scenarios.

Valters IT
DevSecOps & Cyber Threat Intelligence Expert