Secure Information Technology Center – Austria

Analyzing HTTPS services offered by GV.AT domains

In this project several properties of the services offered by gv.at domains have been analyzed. The main emphasis of the analysis was placed on services that were offered via HTTPS (SSL, TLS protocols). The results of this analysis are presented in a technical report. In addition to the analysis, a basic framework for the automated analysis has been implemented.
The main results of the analysis are summarized as follows:

  • 1285 services have been analyzed, 763 of those services do not support HTTPS
  • For the 552 services which offer HTTPS the following details were observed:
    • 59 services were configured for HTTPS. The other 463 services offered default HTTPS services (e.g. provider-specific default HTTPS certificates, or non-valid test certificates)
    • The services have then been analyzed for their supported cipher-suites, which have a strong influence on the security of the TLS protocol.
    • cipher

All details are available in the following report (in German):

Use of SHA-1 in certificates

Multiple vendors of web browsers are intending to retire the popular hash algorithm SHA-1 in favour of more recent alternatives. Therefore, guidelines have been elaborated that plan to take a leave of SHA-1 in multiple steps.

The subsequent table illustrates the support for SHA-1 in a chronological manner and highlights the handling according to the browser. The gradual sunset of SHA-1 is shown separated into steps whereas each is assigned an individual color: Notice (green), Warning (yellow) and escalation (red).

SHA-1

During the HTTPS analysis, a list of signature algorithms used on servers of public institutions, has been composed. Based on that, the following key figures can be derived:

  • 41 servers use a certificate which is no longer valid after 1/1/2016.
  • 21 out of 91 certificates are still valid in 2016. Major browsers will consider the affected servers secure, with minor errors.
  • 27 remaining certificates will be still valid after 1/1/2017. As a consequence, they will appear indifferent to unprotected HTTP connections, starting with the release of Google Chrome in version 40.

A detailed description of all deprecation policies and the list of investigated certificates are explained in the following report (in German):

Posted 7.11.2014, Kategorie: eGovernment, IT-Security.