An issue was discovered in FNET through 4.6.4. The code for processing the hostname from an LLMNR request doesn’t check for ‘ ‘ termination. Therefore, the deduced length of the hostname doesn’t reflect the correct length of the actual data. This may lead to Information Disclosure in _fnet_llmnr_poll in fnet_llmnr.c during a response to a malicious request of the DNS class IN.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-17467
Reference (s):
- http://fnet.sourceforge.net/manual/fnet_history.html
- https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
- https://www.kb.cert.org/vuls/id/815128