ELA-809-1 freeradius security update
Package : freeradiusELA-809-1 freeradius security update
Version : 3.0.17+dfsg-1.1+deb9u1 (stretch)
Related CVEs :
Several flaws were found in freeradius, a high-performance and highly configurable RADIUS server.
In freeradius, the EAP-PWD function compute_password_element() leaks information about the password which allows an attacker to substantially reduce the size of an offline dictionary attack.
In freeradius, when an EAP-SIM supplicant sends an unknown SIM option, the server will try to look that option up in the internal dictionaries. This lookup will fail, but the SIM code will not check for that failure. Instead, it will dereference a NULL pointer, and cause the server to crash.
A flaw was found in freeradius. A malicious RADIUS client or home server can send a malformed attribute which can cause the server to crash.
FreeRADIUS does not prevent use of reflection for authentication spoofing, aka a "Dragonblood" issue, a similar issue to CVE-2019-9497.
FreeRADIUS mishandles the "each participant verifies that the received scalar is within a range, and that the received group element is a valid point on the curve being used" protection mechanism, aka a "Dragonblood" issue, a similar issue to CVE-2019-9498 and CVE-2019-9499.
In FreeRADIUS 3.0 on average 1 in every 2048 EAP-pwd handshakes fails because the password element cannot be found within 10 iterations of the hunting and pecking loop. This leaks information that an attacker can use to recover the password of any user. This information leakage is similar to the "Dragonblood" attack and CVE-2019-9494.
In FreeRADIUS 3.0.x the EAP-pwd module used a global OpenSSL BN_CTX instance to handle all handshakes. This mean multiple threads use the same BN_CTX instance concurrently, resulting in crashes when concurrent EAP-pwd handshakes are initiated. This can be abused by an adversary as a Denial-of-Service (DoS) attack.
A freeradius security update has been released for Debian GNU/Linux 9 Extended LTS to address several flaws.