PT-2020-15009 · Fnet · Fnet

Published 2020-12-11 · Updated 2023-10-12 · CVE-2020-17467

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Name of the Vulnerable Software and Affected Versions FNET versions through 4.6.4

Description An issue was discovered in the code for processing the hostname from an LLMNR request, which doesn't check for '0' termination. 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.

Recommendations For versions through 4.6.4, consider disabling the fnet llmnr poll function in fnet llmnr.c to minimize the risk of exploitation until a patch is available. Restrict access to the DNS class IN to reduce the likelihood of malicious requests.

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2020-17467

Affected Products

Fnet

References · 10

• https://osv.dev/vulnerability/CVE-2020-17467 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-17467 · Security Note
• https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01 · Note
• https://t.me/cvenotify/7060 · Telegram Post
• https://t.me/cvenotify/7292 · Telegram Post
• https://t.me/cibsecurity/20667 · Telegram Post
• https://t.me/cibsecurity/20647 · Telegram Post
• https://t.me/cibsecurity/20687 · Telegram Post
• https://kb.cert.org/vuls/id/815128 · Note
• http://fnet.sourceforge.net/manual/fnet_history.html · Note