CVE-2025-45777: Chavara Matrimony Auth Bypass Vulnerability

CVE-2025-45777 Overview

CVE-2025-45777 is a critical authentication bypass vulnerability discovered in the One-Time Password (OTP) mechanism of Chavara Family Welfare Centre Chavara Matrimony Site v2.0. This vulnerability allows unauthenticated attackers to bypass the authentication process by supplying a crafted request, potentially gaining unauthorized access to user accounts.

Critical Impact

Attackers can bypass authentication entirely without any credentials, potentially compromising user accounts, personal data, and sensitive matrimonial profile information stored on the platform.

Affected Products

• Abeltechsoft Chavara Matrimony v2.0
• Chavara Family Welfare Centre Chavara Matrimony Site

Discovery Timeline

• 2025-07-25 - CVE-2025-45777 published to NVD
• 2025-10-10 - Last updated in NVD database

Technical Details for CVE-2025-45777

Vulnerability Analysis

This vulnerability exists within the OTP verification mechanism of the Chavara Matrimony web application. The flaw stems from improper authentication validation (CWE-287), where the application fails to properly verify OTP tokens before granting access to protected resources. The vulnerability is network-accessible, requires no prior authentication or user interaction, and can lead to complete compromise of confidentiality, integrity, and availability.

Root Cause

The root cause of CVE-2025-45777 lies in improper authentication controls within the OTP verification process. The application does not adequately validate the authenticity of OTP requests, allowing attackers to craft malicious requests that bypass the verification step entirely. This represents a fundamental flaw in the authentication architecture where the server-side validation logic can be circumvented through request manipulation.

Attack Vector

The attack can be executed remotely over the network against the web application's authentication endpoint. An attacker does not require any privileges or user interaction to exploit this vulnerability. The attack involves crafting a specially formed HTTP request to the OTP verification endpoint that causes the application to accept the authentication without proper OTP validation.

The vulnerability mechanism involves intercepting or manipulating the authentication flow during the OTP verification phase. Technical details regarding the specific request manipulation techniques can be found in the GitHub PoC Repository.

Detection Methods for CVE-2025-45777

Indicators of Compromise

• Unusual authentication patterns bypassing normal OTP verification flows
• Multiple successful logins without corresponding valid OTP generation events
• Anomalous requests to OTP verification endpoints with malformed or missing parameters
• User accounts showing access from unexpected locations without proper OTP completion

Detection Strategies

• Monitor authentication logs for successful logins that lack corresponding OTP verification records
• Implement web application firewall rules to detect malformed requests to OTP endpoints
• Deploy anomaly detection to identify authentication patterns that deviate from normal OTP flows
• Review server logs for requests with unexpected parameters targeting authentication endpoints

Monitoring Recommendations

• Enable detailed logging on all authentication endpoints including OTP verification
• Establish baseline metrics for normal OTP verification patterns to detect anomalies
• Configure alerts for authentication successes that bypass expected verification steps
• Implement session tracking to correlate OTP requests with subsequent authenticated sessions

How to Mitigate CVE-2025-45777

Immediate Actions Required

• Restrict access to the Chavara Matrimony application until a patch is available from the vendor
• Implement additional authentication layers such as CAPTCHA or secondary verification
• Deploy web application firewall rules to validate OTP request integrity
• Monitor authentication logs for signs of exploitation

Patch Information

No official vendor patch has been announced at this time. Organizations using Chavara Matrimony v2.0 should contact Abeltechsoft directly for remediation guidance. The application registration page is available at the Chavara Matrimony Signup Page for reference.

Workarounds

• Disable the OTP-based authentication mechanism until properly patched
• Implement server-side request validation to verify OTP token integrity before processing
• Add rate limiting on authentication endpoints to reduce automated attack attempts
• Consider implementing alternative authentication methods such as email-based verification with proper token validation

# Example WAF rule to validate OTP request structure
# Block requests to OTP endpoint missing required parameters
# This is a generic example - adjust based on your WAF platform
SecRule REQUEST_URI "@contains /otp/verify" "chain,id:100001,phase:2,deny,status:403"
SecRule &ARGS:otp_token "@eq 0" "log,msg:'Missing OTP token parameter'"