Ava-416: Escalation of privileges using Aware webhooks

Release Date

14th April 2021.

Overview

An authenticated Ava Aware user with the permission to edit webhooks would have been able to craft a webhook to bypass the API authentication and gain full administrator access to Ava Aware and connected Ava cameras.

Affected Products

• Ava Aware:
  • All Stable upgrade channel versions before 3.5.6.
  • All Beta upgrade channel versions before 3.6.2.
• Ava cameras:
  • All Stable upgrade channel versions before 3.5.6.
  • All Beta upgrade channel versions before 3.6.2.

Unaffected Products

• Ava Aware:
  • All Stable upgrade channel versions after and including 3.5.6.
  • All Beta upgrade channel versions after and including 3.6.2.
• Ava cameras:
  • All Stable upgrade channel versions after and including 3.5.6.
  • All Beta upgrade channel versions after and including 3.6.2.
• Ava Cloud: all versions.

Resolution

This issue has been fixed in Ava Aware Beta upgrade channel version 3.6.2 and Stable upgrade channel version 3.5.6. It is crucial that all installations running an affected version are upgraded to the latest release as soon as possible. Releases are available to download through the Ava Aware User Interface. This issue has been fixed in Ava camera Beta upgrade channel version 3.6.2 and Stable upgrade channel version 3.5.6. It is crucial that all that all Ava camera installations running an affected version upgrade to the latest release as soon as possible. Releases are available to download through the Ava Aware User Interface for Ava managed cameras and the Ava camera User Interface for unmanaged Ava cameras.

Vulnerability Information

• CVE: Pending
• CVSSv3 score: 9.9 (Critical)
• CVSSv3 vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Mitigations

There are no known mitigations for this issue.

Work arounds

The work around for this issue is to remove the "Add/Edit time templates and webhooks" permission for all non-administrator users.

Acknowledgements

Issue found internally by Ava Security.

Disclosure Timeline

• 12/04/2021 Issue found internally by Ava Security
• 12/04/2021 Root cause established
• 12/04/2021 Fix identified
• 14/04/2021 Patched Ava Aware (Stable upgrade channel) released
• 14/04/2021 Patched Ava cameras (Stable upgrade channel) released
• 14/04/2021 Patched Ava Aware (Beta upgrade channel) released
• 14/04/2021 Patched Ava cameras (Beta upgrade channel) released
• 14/04/2021 Advisory published internally
• 14/04/2021 Vulnerability publicly disclosed