CVE-2024-39223

An authentication bypass in the SSH service of gost v2.11.5 allows attackers to intercept communications via setting the HostKeyCallback function to…

Critical · published July 3, 2024

CVSS v3.1
9.8
EPSS
1%
Percentile
52.5
In the wild
Unconfirmed
What it is

🚨 An authentication bypass in gost v2.11.5 could allow attackers to eavesdrop on your SSH conversations with just a simple setting change! 🔥 Think of it like a postal service that mistakenly delivers all letters to your neighbor because they forgot to check the address properly — suddenly, your secret messages are being read by someone they weren’t meant for! 📬 An attacker exploiting this flaw could intercept sensitive SSH communications, gaining access to confidential data, credentials, or even control over your systems. This could lead to catastrophic data breaches, unauthorized access, and a loss of trust from users. It's absolutely devastating!

Put simply

Think of it like a postal service that mistakenly delivers all letters to your neighbor because they forgot to check the address properly — suddenly, your secret messages are being read by someone they weren’t meant for! 📬 This vulnerability arises because the HostKeyCallback function is set to ssh.InsecureIgnoreHostKey, allowing an attacker to bypass authentication checks and capture ongoing SSH sessions.

What to do

An attacker exploiting this flaw could intercept sensitive SSH communications, gaining access to confidential data, credentials, or even control over your systems. This could lead to catastrophic data breaches, unauthorized access, and a loss of trust from users. It's absolutely devastating! To mitigate this, immediately upgrade gost to version 2.11.6 or higher. Ensure the HostKeyCallback is properly configured to enforce strict host key verification. Regularly audit SSH configurations to prevent similar issues in the future. You've got this! Apply these fixes and keep your communications secure! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00696 · 52.5th percentile
Published
2024-07-03T00:00Z
EPSS history
Timeline
  • 03 JUL 00:00Z
    An authentication bypass in the SSH service of gost v2.11.5 allows attackers to intercept communications via setting the HostKeyCallback function to…
    cvelistv5