CVE-2024-1107: Travel APPS Auth Bypass Vulnerability

CVE-2024-1107 Overview

CVE-2024-1107 is an Authorization Bypass Through User-Controlled Key vulnerability (CWE-639) affecting Talya Informatics Travel APPS. This vulnerability enables attackers to exploit incorrectly configured access control security levels, potentially allowing unauthorized access to sensitive resources and functionality within the application. The flaw exists in versions prior to v17.0.68 and can be exploited remotely without authentication.

Critical Impact

This vulnerability allows remote attackers to bypass authorization controls by manipulating user-controlled keys, potentially gaining unauthorized access to other users' data and functionality without requiring any privileges or user interaction.

Affected Products

• Talya Informatics Travel APPS versions before v17.0.68
• talyabilisim:travel_apps (all versions prior to the patched release)

Discovery Timeline

• 2024-06-27 - CVE-2024-1107 published to NVD
• 2025-09-12 - Last updated in NVD database

Technical Details for CVE-2024-1107

Vulnerability Analysis

This vulnerability falls under CWE-639: Authorization Bypass Through User-Controlled Key, commonly known as Insecure Direct Object Reference (IDOR). The Travel APPS application fails to properly validate that users are authorized to access resources they request. Instead, the application relies on user-supplied identifiers (keys) to determine which resources to retrieve or modify, without verifying that the requesting user has legitimate access to those resources.

When an attacker manipulates these user-controlled keys—such as user IDs, booking references, or session tokens—they can access or modify data belonging to other users. The vulnerability is particularly severe in a travel application context, where sensitive personal information, payment details, and booking data may be exposed.

Root Cause

The root cause of this vulnerability lies in the application's failure to implement proper server-side authorization checks. The application trusts user-supplied input to determine access permissions rather than validating the requester's identity and authorization level against the requested resource. This represents a fundamental access control design flaw where the application assumes that if a user knows or can guess a resource identifier, they are authorized to access it.

Attack Vector

The attack is conducted over the network and requires no privileges or user interaction. An attacker can exploit this vulnerability by:

1. Authenticating to the application with a legitimate low-privilege account (or potentially without authentication)
2. Identifying predictable or enumerable resource identifiers in API requests or URLs
3. Modifying these identifiers to reference resources belonging to other users
4. Accessing or manipulating unauthorized data by submitting the modified requests

The vulnerability can be exploited through manipulation of parameters in HTTP requests, such as changing user IDs in API endpoints, modifying booking reference numbers, or altering other object identifiers that the application uses to retrieve sensitive data.

Detection Methods for CVE-2024-1107

Indicators of Compromise

• Unusual patterns of sequential or bulk access to different user account resources from a single session
• API requests containing manipulated user identifiers that don't match the authenticated session
• Access logs showing a single user account retrieving data for multiple different user IDs
• Anomalous spikes in data retrieval requests targeting various resource identifiers

Detection Strategies

• Implement logging and alerting for authorization failures where requested resource ownership doesn't match the authenticated user
• Monitor for enumeration patterns where attackers systematically increment or modify resource identifiers
• Deploy web application firewalls (WAF) configured to detect parameter tampering and IDOR attack patterns
• Review application access logs for discrepancies between authenticated user context and accessed resources

Monitoring Recommendations

• Enable detailed access logging that captures both the authenticated user and the resources being accessed
• Configure alerts for high volumes of authorization check failures from individual IP addresses or sessions
• Implement anomaly detection for unusual access patterns to user-specific resources
• Conduct regular security audits of access control implementations in the Travel APPS deployment

How to Mitigate CVE-2024-1107

Immediate Actions Required

• Upgrade Talya Informatics Travel APPS to version v17.0.68 or later immediately
• Review access logs for evidence of exploitation targeting user-controlled key parameters
• Implement additional server-side authorization validation as a defense-in-depth measure
• Consider restricting access to the application until the patch can be applied in high-risk environments

Patch Information

Talya Informatics has addressed this vulnerability in Travel APPS version v17.0.68. Organizations should upgrade to this version or later to remediate the authorization bypass vulnerability. For additional information, refer to the USOM Security Advisory TR-24-0809.

Workarounds

• Implement additional server-side authorization checks that validate resource ownership before granting access
• Deploy a web application firewall (WAF) with rules to detect and block parameter tampering attempts
• Implement rate limiting on API endpoints to slow down enumeration attacks
• Use indirect reference maps that translate user-supplied identifiers to internal references only after authorization verification

# Example: Verify Travel APPS version
# Check your current Travel APPS installation version
# Ensure version is v17.0.68 or later

# Review access logs for potential exploitation
grep -E "user_id=|booking_id=|reference=" /var/log/travel_apps/access.log | \
  awk '{print $1, $7}' | sort | uniq -c | sort -rn | head -20