Alta Aware — 1584: HTTP/2 denial of service via golang.org/x/net-v0.21.0

Release Date

31st of July 2024.

Overview

A vulnerability exists in HTTP/2 endpoints where an attacker can trigger excessive header data processing by sending numerous CONTINUATION frames. This vulnerability arises from the endpoint's handling of HTTP/2 headers, where, even when exceeding the `MaxHeaderBytes` limit, excess headers are parsed but not allocated memory. An attacker can exploit this by sending Huffman-encoded headers, leading to a disproportionate decoding cost for the endpoint compared to the effort required to send them.

Affected Products

  • Ava Aware:
    • All Stable upgrade channel versions before 6.9.5.
    • All Beta upgrade channel versions before 6.9.0.
  • Ava Cameras:
    • All Stable upgrade Channel versions before 6.9.5.
    • All Beta upgrade channel versions before 6.9.0.
  • Ava Cloud: before 7th May 2024.

Unaffected Products

  • Ava Aware:

    • All Stable upgrade channel versions after and including 6.9.5.
    • All Beta upgrade channel versions after and including 6.9.0.

  • Ava Cameras:

    • All Stable upgrade channel versions after and including 6.9.5.
    • All Beta upgrade channel versions after and including 6.9.0.

  • Ava Cloud: from 7th May 2024

Resolution

This issue has been fixed in Ava Aware Beta upgrade channel version 6.9.0 and Stable upgrade channel version 6.9.5.

It is *highly recommended* that all installations running an affected version are upgraded to the latest release as soon as possible. Releases are available to download through the Alta Aware user interface.

A fix was deployed to the Ava Cloud on 7th May 2024. Ava Cloud customers do not need to take any additional action.

This issue has been fixed in Ava Camera Beta upgrade channel version 6.9.0 and Stable upgrade channel version 6.9.5.

It is highly recommended that all Avigilon Ava and Avigilon Alta cameras running an affected version upgrade to the latest release as soon as possible. Releases are available to download through the Alta Aware user interface for Avigilon Ava adn Avigilon Alta managed cameras and the Avigilon Ava and Avigilon Alta camera user interface for unmanaged Avigilon Ava and Avigilon Alta cameras.

Vulnerability Information

  • CVE: CVE-2023-45288
  • CVSSv3 score: 7.5 (High)
  • CVSSv3 vector: [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H](https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Mitigations

There are no known mitigations for this issue.

Work arounds

There are no known work arounds for this issue.

Acknowledgements

Issue found and reported by the Go team.

Disclosure Timeline

  • 22/04/2024 Issue found
  • 29/04/2024 Root cause established
  • 29/04/2024 Fix identified
  • 07/05/2024 Patched Ava Cloud released
  • 21/05/2024 Patched Ava Aware (Beta upgrade channel) released
  • 01/07/2024 Patched Ava Aware (Stable upgrade channel) released
  • 21/05/2024 Patched Ava Cameras (Beta upgrade channel) released
  • 01/07/2024 Patched Ava Cameras (Stable upgrade channel) released
  • 31/07/2024 Vulnerability publicly disclosed