CVE-2020-27416 – The Mahavitaran Android application versions 7.... (How to Fix)

📋 TL;DR

The Mahavitaran Android application versions 7.50 and earlier contain an improper OTP validation vulnerability that allows remote attackers to take over user accounts. This affects all users of the vulnerable application versions who rely on OTP-based authentication.

💻 Affected Systems

Products:

Mahavitaran Android Application

Versions: 7.50 and prior

Operating Systems: Android

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects the Android mobile application, not web or iOS versions.

📦 What is this software?

Mahavitaran by Mahadiscom

View all CVEs affecting Mahavitaran →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete account takeover allowing attackers to access sensitive user data, perform unauthorized transactions, and impersonate legitimate users.

🟠

Likely Case

Account compromise leading to unauthorized access to personal information and potential financial fraud.

🟢

If Mitigated

No impact if proper OTP validation is implemented with secure session management.

🌐 Internet-Facing: HIGH - The vulnerability is in a mobile application accessible over the internet, allowing remote exploitation.

🏢 Internal Only: LOW - This is a client-side mobile application vulnerability, not an internal network issue.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploitation requires some user interaction but is technically simple once the vulnerability is understood.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Versions after 7.50

Vendor Advisory: Not publicly available

Restart Required: Yes

Instructions:

1. Update the Mahavitaran app via Google Play Store
2. Ensure version is newer than 7.50
3. Restart the application after update

🔧 Temporary Workarounds

Disable vulnerable application

android

Uninstall or disable the Mahavitaran app until patched

adb uninstall com.msedcl.app

🧯 If You Can't Patch

Monitor account activity for suspicious behavior
Enable additional authentication factors if available

🔍 How to Verify

Check if Vulnerable:

Check app version in Google Play Store or app settings - if version is 7.50 or lower, vulnerable

Check Version:

adb shell dumpsys package com.msedcl.app | grep versionName

Verify Fix Applied:

Confirm app version is higher than 7.50 in app settings

📡 Detection & Monitoring

Log Indicators:

Multiple failed OTP attempts followed by successful login
OTP validation bypass patterns

Network Indicators:

Unusual OTP request patterns
OTP reuse detection

SIEM Query:

source="app_logs" AND ("OTP bypass" OR "invalid OTP validation")

📊 Metadata

CVE ID: CVE-2020-27416

CVSS v3 Score: 9.8 (CRITICAL)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-613

Published: December 8, 2021

Last Updated: November 21, 2024

🔗 References

https://cvewalkthrough.com/cve-2021-41716-mahavitaran-android-application-account-take-over-via-otp-fixation/ Third Party Advisory
https://play.google.com/store/apps/details?id=com.msedcl.app&hl=en&gl=US Third Party Advisory
https://cvewalkthrough.com/cve-2021-41716-mahavitaran-android-application-account-take-over-via-otp-fixation/ Third Party Advisory
https://play.google.com/store/apps/details?id=com.msedcl.app&hl=en&gl=US Third Party Advisory

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