Improper Authentication in FreeRADIUS - CVE-2011-2701
Published: August 4, 2011 / Updated: August 3, 2020
Vulnerability identifier: #VU33323
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2011-2701
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
The ocsp_check function in rlm_eap_tls.c in FreeRADIUS 2.1.11, when OCSP is enabled, does not properly parse replies from OCSP responders, which allows remote attackers to bypass authentication by using the EAP-TLS protocol with a revoked X.509 client certificate.
Affected software
FreeRADIUS
freeradius (Alpine package)
freeradius (Alpine package)
How to mitigate CVE-2011-2701
Install update from vendor's website.
FreeRADIUS - update to 2.1.12
freeradius (Alpine package) - update to 2.1.12-r0
freeradius (Alpine package) - update to 2.1.12-r0
External References
- http://secunia.com/advisories/45425
- http://securityreason.com/securityalert/8325
- http://securitytracker.com/id?1025833
- http://www.openwall.com/lists/oss-security/2011/07/15/6
- http://www.openwall.com/lists/oss-security/2011/07/18/2
- http://www.openwall.com/lists/oss-security/2011/07/20/9
- http://www.securityfocus.com/archive/1/518974/100/0/threaded
- http://www.securityfocus.com/bid/48880
- https://bugzilla.redhat.com/show_bug.cgi?id=724815
- https://exchange.xforce.ibmcloud.com/vulnerabilities/68782
- https://www.dfn-cert.de/informationen/Sicherheitsbulletins/dsb-2011-01.html