Get the security features your business needs with a variety of plans at several price points.

Desktop and mobile access protection with basic reporting and secure single sign-on.

All Duo Small/Medium Business features, plus adaptive access policies, greater device visibility, plus advanced device insights and remote access solutions.

FedRamp authorized, end-to-end FIPS compliant, streamlined solutions.

Meet compliance objectives with our friction-free MFA.

Duo provides secure access to any application with a broad range of capabilities.

Verify the identities of all users with MFA.

Provide secure access to on-premise applications.

Ensure all devices meet security standards.

Provide secure access to any app from a single dashboard.

Block or grant access based on users' role, location, and more.

Duo provides secure access for a variety of industries, projects, and companies.

Whether you're considering a big-picture security strategy like zero trust, or you want to address a specific threat like phishing attacks, Duo has you covered.

A zero trust model establishes trust in users and devices through authentication and continuous monitoring.

Duo's comprehensive access security sets the stage for user-friendly, password-free multi-factor authentication.

Secure your workforce against phishing attacks with strong multi-factor authentication, device trust and more.

Duo’s dynamic solution detects and responds to potential threat signals to secure trusted users and frustrate attackers.

Duo delivers peace of mind with strong security and increased productivity at an unmatched value.

Reduce friction and automate processes so that end-users and administrators can focus their time on moving your business forward.

Duo continues to pioneer MFA-approaches that keep your business a step ahead of the next threat.

Our Risk-Based Authentication reduces the burden placed on users so they can verify their identity quickly and get back to the task at hand.

Close the gap on your security perimeter and bring every user and every device under one secure roof.

Duo provides secure access for a variety of industries, projects, and companies.

Click through our instant demos to explore Duo features.

Duo Security is part of Cisco Secure — find out how we make global security resilience easier than ever!

Duo Product Security Advisory

Advisory ID: DUO-PSA-2014-005
Publication Date: 2014-05-12
Revision Date: 2014-05-27
Status: Confirmed, Fixed
Document Revision: 3

Overview

Duo Security has identified an issue in its Credential-Provider based Remote Desktop Protocol (RDP) integrations (e.g. those installed on Windows versions from Vista / Server 2008) which may allow a user with an expired password to - upon completing primary and secondary authentication - switch to another user account using that account's primary credentials, skipping secondary authentication for that account.

Description

The RDP integration works to add two-factor authentication to Windows logins, both Remote Desktop and (optionally) the local console. When a user has provided valid credentials (username and password), the integration presents a second-factor authentication dialog for the provided username. Under normal operation, when the second-factor authentication is successful, the user is logged on.

However, if the user's password has expired, then rather than logging the user in, the system will instead present a prompt requesting a password change. At this prompt, the user may type in a new (different) username and corresponding password - and if these credentials are valid, the user can proceed to log in with (and reset the password for) the new username without any corresponding second-factor authentication challenge for the new username.

Impact

A valid user (with a valid username/password and secondary authenticator) may, if his/her password expires, be able to login to another user account using only that account's username/password - i.e. without secondary authentication - after completing primary and secondary authentication for his/her own account.

Affected Product(s)

Duo RDP Integration (Credential-Provider based) versions 1.0.7 through 1.1.4, running on Windows Vista, Server 2008, and newer.

Solution

Install the latest version of the Duo Security RDP Integration (currently, version 1.1.7) on your host. The latest version can be downloaded at https://dl.duosecurity.com/duo-win-login-latest.exe

Vulnerability Metrics

Vulnerability Class: Privilege Context Switching Error (CWE-270)
Remotely Exploitable: No
Authentication Required: Yes
Severity: Medium
CVSSv2 Overall Score: 5.1
CVSSv2 Group Scores: Base: 5.3, Temporal: 4.6, Environmental: 5.1
CVSSv2 Vector: (AV:L/AC:H/Au:M/C:C/I:C/A:N/E:ND/RL:OF/RC:C/CDP:ND/TD:ND/CR:H/IR:H/AR:ND)

References

CWE-270: Privilege Context Switching Error - https://cwe.mitre.org/data/definitions/270.html

Timeline

2014-03-21

Duo discovers issue internally, identifies and implements fix

2014-04-01

Release is posted on dl.duosecurity.com

2014-04-03

Advisory is drafted, Duo performs additional testing

2014-05-12

Advisory is shared with affected Enterprise customers

2014-05-20

Advisory is shared with affected Business customers
Version number incremented to reflect timeline update

2014-05-27

Advisory is shared with affected Personal and Trial customers
Version number incremented to reflect timeline update

Credits/Contact

Feedback regarding this issue should be sent to support@duosecurity.com and reference "DUO-PSA-2014-005" in the subject.