Google Android 11.0 Vpn.java startLegacyVpnPrivileged downgrade

Summaryinfo

A vulnerability classified as problematic has been found in Google Android 11.0. Impacted is the function startLegacyVpnPrivileged of the file Vpn.java. This manipulation causes downgrade. This vulnerability is registered as CVE-2022-20145. Remote exploitation of the attack is possible. No exploit is available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Google Android 11.0 (Smartphone Operating System). It has been declared as problematic. Affected by this vulnerability is the function startLegacyVpnPrivileged of the file Vpn.java. The manipulation with an unknown input leads to a downgrade vulnerability. The CWE definition for the vulnerability is CWE-757. A protocol or its implementation supports interaction between multiple actors and allows those actors to negotiate which algorithm should be used as a protection mechanism such as encryption or authentication, but it does not select the strongest algorithm that is available to both parties. As an impact it is known to affect confidentiality. The summary by CVE is:

In startLegacyVpnPrivileged of Vpn.java, there is a possible way to retrieve VPN credentials due to a protocol downgrade attack. This could lead to remote escalation of privilege if a malicious Wi-Fi AP is used, with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-11Android ID: A-201660636

The weakness was published 06/15/2022 as A-201660636. It is possible to read the advisory at source.android.com. This vulnerability is known as CVE-2022-20145 since 10/14/2021. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/15/2022). It is expected to see the exploit prices for this product increasing in the near future.The attack technique deployed by this issue is T1562.010 according to MITRE ATT&CK.

Applying a patch is able to eliminate this problem.

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Productinfo

Type

• Smartphone Operating System

Vendor

• Google

Name

• Android

Version

• 11.0

License

• free

Website

• Vendor: https://www.google.com/

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