CVE-2024-6400: Finrota Auth Bypass Vulnerability

CVE-2024-6400 Overview

CVE-2024-6400 is a high-severity vulnerability in Finrota Netahsilat, a payment collection platform. The flaw combines cleartext storage of sensitive information with exposure through data queries [CWE-202]. Attackers can retrieve embedded sensitive data, bypass authentication, inject IMAP/SMTP commands, and collect data from common resource locations. Finrota resolved the issue in versions 1.21.10, 1.23.01, 1.23.08, 1.23.11, and 1.24.03.

Critical Impact
Successful exploitation allows attackers to harvest embedded credentials, bypass authentication controls, and execute IMAP/SMTP command injection against the Netahsilat payment platform.

Affected Products

Finrota Netahsilat versions prior to 1.21.10
Finrota Netahsilat versions prior to 1.23.01, 1.23.08, and 1.23.11
Finrota Netahsilat versions prior to 1.24.03

Discovery Timeline

2024-10-04 - CVE-2024-6400 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-6400

Vulnerability Analysis

CVE-2024-6400 chains multiple weaknesses in Finrota Netahsilat that together expose sensitive data to unauthorized parties. The core defect is cleartext storage of sensitive information, classified under [CWE-202] (Exposure of Sensitive Information Through Data Queries). Attackers with low privileges and network access can query the application to retrieve embedded secrets. The exposed data supports follow-on attacks including authentication bypass and IMAP/SMTP command injection.

The vulnerability requires user interaction and low-level privileges but delivers high impact against confidentiality. Subsequent system confidentiality is also affected, indicating that harvested data enables lateral movement beyond the immediate application boundary. Finrota Netahsilat handles payment collection workflows, so exposed secrets may include integration credentials for mail servers, banking APIs, and internal services.

Root Cause

The root cause is the storage of sensitive values, such as credentials and configuration secrets, in cleartext within application data accessible through standard queries. When authenticated but low-privileged users interact with specific application functions, the backend returns embedded sensitive fields without proper redaction or access control. This design flaw enables both direct data harvesting and downstream injection attacks against connected services.

Attack Vector

An attacker with a low-privileged account and network access to the Netahsilat application triggers vulnerable queries after limited user interaction. The application returns cleartext secrets embedded in responses. The attacker then reuses those secrets to bypass authentication or to craft malicious IMAP/SMTP commands against connected mail infrastructure. No verified proof-of-concept code has been published for CVE-2024-6400. Technical details are referenced in the Siber Güvenlik Notification TR-24-1611 and USOM Notification TR-24-1611.

Detection Methods for CVE-2024-6400

Indicators of Compromise

Unusual query patterns from low-privileged accounts targeting configuration or settings endpoints of Netahsilat
Outbound IMAP or SMTP traffic from the Netahsilat application host containing unexpected command sequences or CRLF injection payloads
Successful authentication events using service or integration credentials from anomalous source IP addresses
Repeated data export or query operations returning large response payloads to a single authenticated session

Detection Strategies

Baseline normal query behavior for each Netahsilat user role and alert on deviations, especially high-volume access to configuration-related endpoints
Inspect SMTP and IMAP traffic originating from the application for CRLF sequences and unexpected verbs that indicate command injection
Correlate authentication events across integrated systems to identify reuse of credentials that should remain isolated to Netahsilat

Monitoring Recommendations

Enable verbose application logging for Netahsilat query and export functions and forward logs to a centralized SIEM
Monitor mail server logs for authentication attempts and command sequences that originate from the Netahsilat service account
Track version and patch state of Netahsilat deployments to confirm all instances run a fixed release

How to Mitigate CVE-2024-6400

Immediate Actions Required

Upgrade Finrota Netahsilat to a fixed version: 1.21.10, 1.23.01, 1.23.08, 1.23.11, or 1.24.03 depending on your release branch
Rotate all credentials, API keys, and mail server passwords that were stored or referenced by the Netahsilat application
Audit low-privileged accounts for suspicious query activity since the deployment of the affected version
Restrict network egress from the Netahsilat host to only required IMAP/SMTP and payment endpoints

Patch Information

Finrota released fixes across five branches: 1.21.10, 1.23.01, 1.23.08, 1.23.11, and 1.24.03. Administrators should apply the patch corresponding to their deployment branch. Refer to the USOM Notification TR-24-1611 advisory for vendor-coordinated update guidance.

Workarounds

Limit access to the Netahsilat application to trusted internal networks using firewall rules or a reverse proxy with strict allow-listing
Disable or restrict user accounts that do not require access to the application until patching completes
Enforce multi-factor authentication on all Netahsilat accounts and on connected mail infrastructure to reduce reuse of exposed credentials

bash

# Configuration example: restrict inbound access to Netahsilat via iptables
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP

# Restrict outbound SMTP/IMAP from the app host to approved mail servers only
iptables -A OUTPUT -p tcp -m multiport --dports 25,465,587,143,993 -d mail.example.com -j ACCEPT
iptables -A OUTPUT -p tcp -m multiport --dports 25,465,587,143,993 -j DROP