Home/CVE/JetBrains TeamCity Authentication Bypass Vulnerability
CVE

CVE-2023-42793

JetBrains TeamCity Authentication Bypass Vulnerability

In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible.

CRITICAL · CVSS 9.8 ⚠ CISA KEV EPSS 0.92913 Ransomware: known
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • Linked to known ransomware campaigns
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules10 YARA rules1
⬢

Required Remediation

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

◆

Threat Actors Linked

2
actorAndariel
actorAPT29
⬡

Weakness Classification

CWE-288Authentication Bypass Using an Alternate Path or Channel
CWE-306Missing Authentication for Critical Function
▤

Affected Products & Versions

1
jetbrains teamcity< 2023.05.4
⚠

Public Exploits & PoCs

4
remoteJetBrains TeamCity 2023.05.3 - Remote Code Execution (RCE)2024-03-14
nucleiJetBrains TeamCity < 2023.05.4 - Remote Code Executioncritical
pocpacketstormsecurity.com · JetBrains-TeamCity-Unauthenticated-Remote-Code-Execution....packetstormsecurity.com
pocwww.sonarsource.com · teamcity-vulnerabilitywww.sonarsource.com
◈

Detection Rules (IDS/IPS)

2
et-openET EXPLOIT JetBrains TeamCity Auth Bypass Attempt (CVE-2023-42793)attempted-admin
et-openET EXPLOIT JetBrains TeamCity Auth Bypass Successful Attempt (CVE-2023-42793)successful-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
◈

Sigma Hunt Rules

10
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
relatedcriticalBitbucket Unauthorized Full Data Export Triggered
relatedcriticalBitbucket Unauthorized Access To A Resource
relatedcriticalAntivirus Exploitation Framework Detection
relatedcriticalAntivirus Password Dumper Detection
relatedcriticalAntivirus Ransomware Detection
relatedcriticalWebshell Remote Command Execution
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@jetbrains.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD19 Sep 2023 · 05:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
cisaKEV-CVE-2023-42793
splunk-security-content89a58e5f-1365-4793-b45c-770abbb32b6c
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://attackerkb.com/topics/1XEEEkGHzt/cve-2023-42793Third Party Advisory
https://blog.jetbrains.com/teamcity/2023/09/cve-2023-42793-vulnerability-post-mortem/Vendor Advisory
https://www.jetbrains.com/privacy-security/issues-fixed/Vendor Advisory
https://www.rapid7.com/blog/post/2023/09/25/etr-cve-2023-42793-critical-authentication-bypass-in-jetbrains-teamcity-ci-cd-servers/Broken LinkThird Party Advisory
https://www.securityweek.com/recently-patched-teamcity-vulnerability-exploited-to-hack-servers/Press/Media Coverage
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-42793US Government Resource
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