FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

freeradius -- insufficent CRL application vulnerability

Affected packages
freeradius2 < 2.2.8
freeradius3 < 3.0.9

Details

VuXML ID 379788f3-2900-11e5-a4a5-002590263bf5
Discovery 2015-06-22
Entry 2015-07-13

oCERT reports:

The FreeRADIUS server relies on OpenSSL to perform certificate validation, including Certificate Revocation List (CRL) checks. The FreeRADIUS usage of OpenSSL, in CRL application, limits the checks to leaf certificates, therefore not detecting revocation of intermediate CA certificates.

An unexpired client certificate, issued by an intermediate CA with a revoked certificate, is therefore accepted by FreeRADIUS.

Specifically sets the X509_V_FLAG_CRL_CHECK flag for leaf certificate CRL checks, but does not use X509_V_FLAG_CRL_CHECK_ALL for CRL checks on the complete trust chain.

The FreeRADIUS project advises that the recommended configuration is to use self-signed CAs for all EAP-TLS methods.

References

CVE Name CVE-2015-4680
FreeBSD PR ports/201058
FreeBSD PR ports/201059
URL http://freeradius.org/security.html
URL http://www.ocert.org/advisories/ocert-2015-008.html