VMware Tools contains an Authentication Bypass vulnerability in the vgauth module. VMware has evaluated the severity of this issue to be in the Low severity range with a maximum CVSSv3 base score of 3.9.

This page covers details of the vulnerability and an incident response plan if your system is affected. For more information on the latest updates and the timeline of the vulnerability, you can visit this page. Have questions about this vulnerability? Check out our detailed FAQ page. You can also sign up for a complementary vulnerability audit on this page. Our emergency support team will help you through a one-on-one session and manually run the tool, check for indicators of compromise, and answer all your questions.


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Attackers used specially crafted Rest API URLs that were able to bypass this security filter due to an error in normalizing the URLs before validation. This, in turn, gave attackers access to REST API endpoints, and they exploited the endpoints to perform subsequent attacks such as arbitrary command execution. The following exploit analysis flowchart shows how the attackers exploited the vulnerability.

Folks from the Rinella Learning Center and select groups across campus are able to bypass students irrespective of what classes they are registered for. Thus, students seeking accommodations and those who take exams at the RLC will be able to be bypassed from needing Duo in Canvas on those days.

Now for the fun stuff. As I further enumerated the unfamiliar port on this now-identified Nutanix box, I found that the SSH server was actually being ran by Paramiko v1.15.2. This library is listed in CVE-2018-7750 as being vulnerable to an authentication bypass. At this point I got excited, but I could find no proof-of-concept (PoC) code about how to bypass the login prompt. So, I continued my research, and stumbled upon this issue on GitHub. The discussion gave me enough of a clue to allow me to build the following PoC in order to exploit the vulnerable library.

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VMware has released security updates to address three critical severity vulnerabilities in the Workspace ONE Assist solution that enable remote attackers to bypass authentication and elevate privileges to admin.

The flaws are tracked as CVE-2022-31685 (authentication bypass), CVE-2022-31686 (broken authentication method), and CVE-2022-31687 (broken authentication control) and have received 9.8/10 CVSSv3 base scores.

"A malicious actor with network access to Workspace ONE Assist may be able to obtain administrative access without the need to authenticate to the application," VMware describes the three security bugs.

VMware also patched a reflected cross-site scripting (XSS) vulnerability (CVE-2022-31688) that enables attackers to inject javascript code in the target user's window and a session fixation vulnerability (CVE-2022-31689) that allows authentication after obtaining a valid session token.

In August, VMware warned admins to patch another critical authentication bypass security flaw in VMware Workspace ONE Access, Identity Manager, and vRealize Automation, enabling unauthenticated attackers to gain admin privileges.

In May, VMware patched an almost identical critical vulnerability, another authentication bypass (CVE-2022-22972) found by Bruno Lpez of Innotec Security in Workspace ONE Access, VMware Identity Manager (vIDM), and vRealize Automation.

Summoning Team's Sina Kheirkhah, who published the PoC following an analysis of the patch released by VMware, said the root cause can be traced back to a bash script containing a method named refresh_ssh_keys(), which is responsible for overwriting the current SSH keys for the support and ubuntu users in the authorized_keys file.

The release of the PoC coincides with the virtualization technology giant issuing fixes for a high-severity SAML token signature bypass flaw (CVE-2023-20900, CVSS score: 7.5) across several Windows and Linux versions of VMware Tools.

"A malicious actor with man-in-the-middle (MITM) network positioning in the virtual machine network may be able to bypass SAML token signature verification, to perform VMware Tools Guest Operations," the company said in an advisory released Thursday.

Launch SP flash tool, load the scatter file for your model with at least one box ticked (file to be flashed) then click Download (with a green arrow above it). This is like setting SP flash tool for flashing before connecting the device.

VMware addressed an authentication bypass vulnerability in VMware Tools. CVE-2023-20867 may allow attackers to execute privileged commands across Windows, Linux, and PhotonOS (vCenter) guest VMs without authentication.

VMware Tools is a set of services and modules that enable several features in VMware products. The tools offer better guest operating systems management and seamless user interactions. VMware Tools allow users to customize guest operating systems as a part of the vCenter Server and other VMware products.

The authentication bypass vulnerability exists in the vgauth module of VMware Tools. A fully compromised VMware ESXi host may cause VMware Tools to fail to authenticate host-to-guest operations, which may affect the confidentiality and integrity of the guest virtual machine.

Successful exploitation of the vulnerability may allow an attacker to execute privileged Guest Operations on guest VMs from a compromised ESXi host without the authentication with the guest VM by targeting the authentication check mechanism.

The vpxuser account is created by vCenter Server when the host is first attached and is used for privileged authentication to ESXi. While vCenter Server automatically rotates the password on an interval governed by VirtualCenter.VimPasswordExpirationInDays, also has shell access which can be deactivated in ESXi 8 to reduce the attack surface.

The Duo Authentication Proxy is an on-premises software service that receives authentication requests from your local devices and applications via RADIUS or LDAP, optionally performs primary authentication against your existing LDAP directory or RADIUS authentication server, and then contacts Duo to perform secondary authentication. Once the user approves the two-factor request (received as a push notification from Duo Mobile, or as a phone call, etc.), the Duo proxy returns access approval to the requesting device or application.

In addition to providing two-factor authentication, the Duo Authentication Proxy is a required component for importing Active Directory or OpenLDAP users into Duo via sync, Active Directory authentication for Duo Single Sign-On, and can also act as an HTTP proxy itself for other systems that also need to contact Duo's cloud service.

Note that use of LDAP or TLS on Linux decreases the authentication rate by 250 auths/minute on each side. For example, the effective authentication rates for various combinations on a Linux server will be:

Consider using load balancers when your expected authentication rates exceed the maximum stated for your Authentication Proxy operating system and your intended authentication configuration. The Authentication Proxy does not natively support load balancing and treats each load balancer node as a standard client/server, so the authentication rate does not change for an individual Duo proxy server.

Download the most recent Authentication Proxy for Unix from -latest-src.tgz. From the command line you can use curl or wget to download the file, like $ wget --content-disposition -latest-src.tgz. Depending on your download method, the actual filename may reflect the version e.g. duoauthproxy-6.2.0-src.tgz. View checksums for Duo downloads here.

Authentication Proxy v5.1.0 and later includes the authproxyctl executable, which shows the connectivity tool output when starting the service. The installer adds the Authentication Proxy C:\Program Files\Duo Security Authentication Proxy\bin to your system path automatically, so you should not need to specify the full path to authproxyctl to run it.

Download the most recent Authentication Proxy for Unix from -latest-src.tgz. From the command line you can use curl or wget to download the file, like $ wget --content-disposition -latest-src.tgz. Depending on your download method, the actual filename may reflect the version e.g. duoauthproxy-6.2.0-src.tgz. View checksums for Duo downloads here.

Use the Proxy Manager text editor in the "Configure" pane to make the authproxy.cfg changes as instructed by the relevant Duo application documentation. As you type into the editor, the Proxy Manager will automatically suggest configuration options. Accepting these suggestions helps make sure you use the correct option syntax.

The Proxy Manager will not encrypt password and secret values for you. Continue using the authproxy_passwd.exe utility to produce encrypted password and secret values, and you can copy those values and paste them into the Proxy Manager editor.

While you edit the authproxy.cfg contents, your changes get saved to a temporary swap file (%ProgramFiles%\Duo Security Authentication Proxy\conf.authproxy.cfg.tmp). No changes are made to the actual authproxy.cfg file until you click Save. 17dc91bb1f

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