CVE-2019-25436 Overview
CVE-2019-25436 is an authentication bypass vulnerability affecting Sricam DeviceViewer version 3.12.0.1. The vulnerability allows authenticated users to change passwords without proper validation of the old password field. By injecting a large payload into the old password parameter during the password change process, attackers can bypass validation controls and set an arbitrary new password.
This vulnerability is classified under CWE-303 (Incorrect Implementation of Authentication Algorithm), indicating a fundamental flaw in how the application handles password change authentication logic. The local attack vector combined with the requirement for user interaction limits the exposure, but successful exploitation can lead to unauthorized account takeover within the device management environment.
Critical Impact
Authenticated attackers can bypass old password validation and set arbitrary new passwords, potentially leading to account takeover and unauthorized access to connected surveillance devices.
Affected Products
- Sricam DeviceViewer version 3.12.0.1
- Sricam IP Camera management software
Discovery Timeline
- 2026-02-20 - CVE-2019-25436 published to NVD
- 2026-02-26 - Last updated in NVD database
Technical Details for CVE-2019-25436
Vulnerability Analysis
The vulnerability exists in the password change functionality of Sricam DeviceViewer. When a user attempts to change their password, the application should validate that the provided old password matches the current stored password before allowing the change. However, the validation mechanism can be bypassed by sending an oversized payload in the old password field.
This authentication bypass allows an attacker with valid low-privileged access to the application to modify passwords without knowing the existing credentials. The flaw represents an incorrect implementation of the authentication algorithm, where boundary conditions in the old password field are not properly enforced, leading to validation failure that defaults to allowing the password change operation.
Root Cause
The root cause is an improper input validation and incorrect implementation of the authentication algorithm (CWE-303). The application fails to properly handle large inputs in the old password parameter, causing the validation logic to be bypassed. This likely occurs due to buffer handling issues or logic errors where oversized inputs cause the validation check to return a success state rather than properly failing.
Attack Vector
The attack requires local access to the Sricam DeviceViewer application and an authenticated session. The attacker must have legitimate low-privileged access to the password change functionality. By crafting a malicious request with an oversized payload in the old password field, the attacker can bypass the password verification step and set a new password of their choosing.
The attack flow involves:
- Authenticating to Sricam DeviceViewer with valid credentials
- Navigating to the password change functionality
- Injecting a large payload into the old password field
- Specifying the desired new password
- Submitting the request, which bypasses validation and accepts the new password
Technical details and proof-of-concept information can be found in the Exploit-DB #47476 entry and the VulnCheck Security Advisory.
Detection Methods for CVE-2019-25436
Indicators of Compromise
- Unusual password change activities in Sricam DeviceViewer audit logs
- Multiple failed login attempts followed by successful authentication after password changes
- Network traffic showing abnormally large payloads in password change requests
- Unexpected account lockouts or password reset events
Detection Strategies
- Monitor application logs for password change events, particularly those with unusual parameter sizes
- Implement network traffic analysis to detect oversized HTTP POST requests to password change endpoints
- Deploy endpoint detection and response (EDR) solutions to monitor for suspicious application behavior
- Configure SentinelOne agents to detect unusual process activity associated with Sricam DeviceViewer
Monitoring Recommendations
- Enable verbose logging for all authentication-related events in Sricam DeviceViewer
- Set up alerts for password changes occurring outside normal business hours
- Monitor for rapid successive password change attempts from the same user session
- Review access logs regularly for anomalous patterns in the device management interface
How to Mitigate CVE-2019-25436
Immediate Actions Required
- Restrict access to Sricam DeviceViewer to trusted users only
- Implement network segmentation to isolate systems running the vulnerable software
- Enable multi-factor authentication where possible as an additional security layer
- Monitor for any unauthorized password changes and reset affected accounts
Patch Information
No official patch information is currently available from Sricam. Users should check the Sricam Official Website for security updates and consider the following alternatives:
- Contact Sricam support for guidance on available updates or fixes
- Consider migrating to alternative device viewer software if no patch is forthcoming
- Implement compensating controls to reduce exposure
Workarounds
- Limit user access to the password change functionality through network access controls
- Implement a web application firewall (WAF) or proxy to filter and limit request payload sizes
- Use strong network segmentation to isolate systems running Sricam DeviceViewer
- Deploy additional authentication mechanisms to protect the password change workflow
- Regularly audit user accounts and remove unnecessary access privileges
# Network-level mitigation: Restrict access to Sricam DeviceViewer
# Example firewall rule to limit access to trusted IP ranges only
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
