Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT Security Bulletin
ASB-2017.0079
Security Advisory: FreeRADIUS Erroneous Session Resumption
1 June 2017
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: FreeRADIUS
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
Member content until: Saturday, July 1 2017
OVERVIEW
FreeRADIUS server is vulnerable to TLS resumption authentication
bypass for versions prior to 3.0.14. [1]
IMPACT
The following information was provided by the developer:
"... server could be convinced to permit TLS session resumption
before the authentication finished." [1]
"We believe that this issue affects all versions of FreeRADIUS which
use EAP methods based on EAP-TLS" [1]
MITIGATION
The developer provided the following advice:
"The short-term fix is to disable session resumption in the cache
subsection of the eap module." [1]
"versions 1.0.x, 1.1.x, 2.0.x, 2.1.x, and 2.2.x are old and
unsupported. Patches for those versions will not be released..." [1]
"prior to version 3, the session cache was disabled by default, and
required administrator intervention to enable it. " [1]
" v4.0.x branch is not vulnerable to this issue" [1]
"A better fix was put into the server, and was released in version
3.0.14." [1][2]
REFERENCES
[1] FreeRADIUS Erroneous Session Resumption
http://freeradius.org/security.html
[2] FreeRADIUS Download
http://freeradius.org/download.html
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.
===========================================================================
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.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=69cs
-----END PGP SIGNATURE-----