CVE-2023-43644CWE-306

Improper authentication in the SOCKS5 inbound in sing-box

Critical · published September 25, 2023

CVSS v3.1
9.1
EPSS
1%
Percentile
56.9
In the wild
Unconfirmed
What it is

🚨 One crafty request can let attackers slip right past authentication! This vulnerability in Sing-box affects all SOCKS5 inbounds, essentially turning a security feature into an open door. 🔥 Think of it like a fancy nightclub where you need to show ID to get in. But if someone crafts a fake ID, they can stroll right past the bouncer without a second glance – that’s what this authentication bypass does! An attacker could exploit this vulnerability to access sensitive resources without any credentials, potentially leading to unauthorized actions and data exposure. If your SOCKS5 inbounds are exposed, it’s a recipe for disaster, enabling attackers to exploit the system as they please!

Put simply

Think of it like a fancy nightclub where you need to show ID to get in. But if someone crafts a fake ID, they can stroll right past the bouncer without a second glance – that’s what this authentication bypass does! This vulnerability occurs in Sing-box when specially crafted requests bypass user authentication, allowing unauthorized access to SOCKS5 connections. This means that attackers can essentially trick the system into thinking they're legitimate users.

What to do

An attacker could exploit this vulnerability to access sensitive resources without any credentials, potentially leading to unauthorized actions and data exposure. If your SOCKS5 inbounds are exposed, it’s a recipe for disaster, enabling attackers to exploit the system as they please! Immediate action is crucial: upgrade Sing-box to version 1.4.4 or 1.5.0-rc.4 to patch this vulnerability. If an update isn’t feasible, ensure that your SOCKS5 inbound isn’t exposed to any insecure environments to mitigate the risk! You've got this! With a quick update, you can secure your Sing-box and keep those pesky attackers at bay! 🛡️

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00823 · 56.9th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2023-09-25T19:12Z
EPSS history
Timeline
  • 25 SEP 19:12Z
    Improper authentication in the SOCKS5 inbound in sing-box
    cvelistv5