Published:
28 January 2022
Protect yourself against future threats.
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AUSCERT Security Bulletin
ASB-2022.0048
AusCERT Bulletin Impact/Access Assessment to CVSS Migration
28 January 2022
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OVERVIEW
AusCERT's own Impact and Access Assessment is being replaced by the
industry standard CVSS score in our Security Bulletins Service. You
can filter (or use scripts) for "CVSS (Max)" and "ALERT" to prioritise
vulnerability management.
We've been planning changes and improvements to our Security Bulletins
Service for quite some time, you might remember our AusCERT Security
Bulletins survey released at the end of 2020. Through this process
it was clear that Security Bulletins are very important to our
members, however the detailed Impact and Access Vector assessment
while "nice-to-have" is not essential, whereas the CVSS score
certainly is.
The Impact and Access Vector system is of AusCERT's own design many
years ago, before CVSS Version 1 was released by NVD. For more
information on CVSS, see https://nvd.nist.gov/vuln-metrics/cvss.
CVSS has become a well-used worldwide standard, now in its third
version. Therefore in place of the AusCERT Impact and Access Vector,
beginning Monday 31 January 2022 bulletins will have a CVSS score
which will make prioritisation and automation much more streamlined.
A new line in each Security Bulletin "CVSS (Max)" will show the
highest scoring CVE and its associated Vector String, as per CVSS
guidelines.
Some bulletins may not have any CVSS score available from the vendor
(or NVD) at the time AusCERT redistributes them. Also, history has
shown that a low-CVSS-scoring vulnerability can over time increase
in severity for a variety of other reasons. This is where the AusCERT
Analyst Team's expertise will continue to provide you relevant
contextual information: the [ALERT] tag in the email subject line
informs you the bulletin is particularly time critical or references
an actively exploited vulnerability.
As we continue to evolve the Security Bulletins Service you'll start
to see more information and research from the Analyst Team in the
form of AusCERT Security Bulletins (ASBs). If you'd like detailed
information on AusCERT's implementation of CVSS in our Security
Bulletins, please see our blog here:
https://auscert.org.au/blogs/bulletin-impact-access-to-cvss-migration/
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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