F5 Networks BIG-IP : OpenSSL vulnerability (K23512141)
Medium Nessus Plugin ID 94449
SynopsisThe remote device is missing a vendor-supplied security patch.
DescriptionThe DTLS implementation in OpenSSL before 1.1.0 does not properly restrict the lifetime of queue entries associated with unused out-of-order messages, which allows remote attackers to cause a denial of service (memory consumption) by maintaining many crafted DTLS sessions simultaneously, related to d1_lib.c, statem_dtls.c, statem_lib.c, and statem_srvr.c. (CVE-2016-2179)
An attacker can send a fragmented, incomplete message followed by a 'retransmission' message. In this case, the system accepts the retransmission message but the queue retains the original fragments, which consumes system resources. By repeating this process many times, the attacker can cause resource exhaustion.
SolutionUpgrade to one of the non-vulnerable versions listed in the F5 Solution K23512141.