Alta Aware — 1702: Inefficient regular expression in Alta Video Web UI could lead to denial of service

Release Date

4th of December 2024.

Overview

A regular expression vulnerability was identified in the Alta Video Web UI. The vulnerability arises from a regex pattern that can cause exponential backtracking when processing strings starting with '0' and containing numerous repetitions of '0-0'. This backtracking can lead to significant performance degradation and potential denial-of-service conditions.

Affected Products

• Alta Video:
  • All Stable upgrade channel versions before 7.0.8.
  • All Beta upgrade channel versions before 7.0.0.

Unaffected Products

• Alta Video:

  • All Stable upgrade channel versions after and including 7.0.8.
  • All Beta upgrade channel versions after and including 7.0.0.

• Avigilon Cloud-Native Cameras: all versions.

• Alta Video Cloud: all versions.

Resolution

This issue has been fixed in Alta Video Beta upgrade channel version 7.0.0 and Stable upgrade channel version 7.0.8.

It is strongly 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 Video User Interface.

Vulnerability Information

• CVSSv3 score: 4.3 (Medium)
• CVSSv3 vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Mitigations

There are no known mitigations for this issue.

Work arounds

There are no known work arounds for this issue.

Acknowledgements

Issue found internally by Avigilon Alta.

Disclosure Timeline

• 15/05/2024 Issue found
• 19/06/2024 Root cause established
• 20/06/2024 Fix identified
• 02/07/2024 Patched Alta Video (Beta upgrade channel) released
• 27/08/2024 Patched Alta Video (Stable upgrade channel) released
• 04/12/2024 Vulnerability publicly disclosed