CVE-2023-42793KEV · OVERDUECWE-288

JetBrains TeamCity Authentication Bypass Vulnerability

Critical · published September 19, 2023

Patch now

Confirmed exploited, and the score agrees

CVSS calls it critical at 9.8. It is confirmed in active exploitation. It sits in the 100.0th percentile for exploit probability.

1095
days past CISA
deadline
CVSS v3.1
9.8
EPSS
100%
Percentile
100.0
In the wild
Confirmed
What it is

🚨 An authentication bypass in JetBrains TeamCity could let attackers waltz right in and execute commands as if they were the admin — and it’s been exploited already! 🔥 Imagine a hotel with a front desk that doesn’t check IDs. Anyone can just stroll in, unlock the staff-only area, and start throwing parties in the boardroom! That’s what this vulnerability allows on the TeamCity server. An attacker could gain full control of your TeamCity server, accessing sensitive data, altering configurations, or even deploying malicious code. This could lead to catastrophic data breaches and disruptions in service — absolutely devastating for any organization relying on TeamCity for CI/CD operations!

Put simply

Imagine a hotel with a front desk that doesn’t check IDs. Anyone can just stroll in, unlock the staff-only area, and start throwing parties in the boardroom! That’s what this vulnerability allows on the TeamCity server. This vulnerability allows unauthorized users to bypass authentication in TeamCity before version 2023.05.4, leading to potential remote code execution on the server. A lack of proper validation checks lets attackers impersonate legitimate users.

What to do

An attacker could gain full control of your TeamCity server, accessing sensitive data, altering configurations, or even deploying malicious code. This could lead to catastrophic data breaches and disruptions in service — absolutely devastating for any organization relying on TeamCity for CI/CD operations! Immediately update to TeamCity version 2023.05.4 or later to close this critical hole. Review your access controls and consider implementing additional security measures like multi-factor authentication to bolster your defenses. Don’t wait — time’s a-ticking! You've got this! Quick action will help you secure your environment and keep those cyber villains at bay! 🛡️

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
0.99987 · 100.0th percentile
Weakness
CWE-288 · Authentication Bypass Using an Alternate Path or Channel
Published
2023-09-19T16:57Z
KEV added
2023-10-04 · due 2023-10-25
EPSS history
Timeline
  • 04 OCT 00:00Z
    Added to CISA KEV — remediate by Oct 25
    kev
  • 19 SEP 16:57Z
    In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible
    cvelistv5