K23512141 : OpenSSL vulnerability CVE-2016-2179

Security Advisory Description

The 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)

Impact

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.