ELA-809-1 freeradius security update

multiple vulnerabilities

Version3.0.17+dfsg-1.1+deb9u1 (stretch)
Related CVEs CVE-2019-11234 CVE-2019-11235 CVE-2019-13456 CVE-2019-17185 CVE-2022-41859 CVE-2022-41860 CVE-2022-41861

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.

For Debian 9 stretch, these problems have been fixed in version 3.0.17+dfsg-1.1+deb9u1.

We recommend that you upgrade your freeradius packages.

Further information about Extended LTS security advisories can be found in the dedicated section of our website.