analyzer/protocol/dnp3/DNP3.cc in Bro before 2.3.2 does not properly handle zero values of a packet length, which allows remote attackers to cause a denial of service (buffer overflow or buffer over-read if NDEBUG; otherwise assertion failure) via a crafted DNP3 packet.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1521
Reference (s):
- https://github.com/bro/bro/commit/6cedd67c381ff22fde653adf02ee31caf66c81a0