CVE-2025-31141: JetBrains TeamCity Info Disclosure Flaw

CVE-2025-31141 Overview

CVE-2025-31141 is an information disclosure vulnerability affecting JetBrains TeamCity, a popular continuous integration and deployment server. The vulnerability allows credential leakage through exception handling on the Cloud Profiles page. When an exception occurs, sensitive credential information may be exposed to unauthorized parties, potentially compromising cloud infrastructure configurations and associated secrets.

Critical Impact

Attackers exploiting this vulnerability could gain access to cloud provider credentials configured in TeamCity, enabling unauthorized access to cloud infrastructure, data exfiltration, or lateral movement within connected environments.

Affected Products

• JetBrains TeamCity versions prior to 2025.03
• TeamCity Cloud Profiles configurations
• TeamCity deployments with cloud provider integrations

Discovery Timeline

• 2025-03-27 - CVE CVE-2025-31141 published to NVD
• 2025-05-16 - Last updated in NVD database

Technical Details for CVE-2025-31141

Vulnerability Analysis

This vulnerability is classified under CWE-209 (Generation of Error Message Containing Sensitive Information). The flaw exists in how TeamCity handles exceptions on the Cloud Profiles page. When certain error conditions trigger exceptions, the application fails to properly sanitize error messages before presenting them to users or including them in logs. This improper error handling results in credential information being leaked through exception details.

The network-accessible nature of TeamCity installations means that attackers can potentially trigger these exception conditions remotely without requiring prior authentication. The vulnerability specifically impacts the confidentiality of cloud credentials stored within TeamCity's configuration, though it does not directly allow modification of data or denial of service.

Root Cause

The root cause of CVE-2025-31141 lies in improper exception handling within the Cloud Profiles page functionality. When processing cloud provider configurations, the application catches exceptions but fails to sanitize sensitive credential data before including it in error messages or stack traces. This violates secure coding practices that mandate sensitive information should never be exposed through error handling mechanisms.

The exception handling code likely passes credential objects or configuration strings directly to error logging or display functions without first redacting sensitive fields such as API keys, secret tokens, or authentication credentials.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no user interaction or prior privileges. An attacker can exploit this vulnerability by:

1. Accessing the TeamCity web interface remotely
2. Navigating to or triggering requests to the Cloud Profiles page
3. Manipulating requests or inputs to trigger exception conditions
4. Capturing the exposed credentials from error responses

The vulnerability manifests in the exception handling mechanism when processing Cloud Profiles configurations. When errors occur, credential information is inadvertently included in exception messages. For detailed technical analysis, refer to the JetBrains Security Issues Fixed advisory.

Detection Methods for CVE-2025-31141

Indicators of Compromise

• Unusual access patterns to the Cloud Profiles page in TeamCity access logs
• Exception or error logs containing cloud provider credential fragments
• Unauthorized authentication attempts to cloud providers using TeamCity-configured credentials
• Anomalous API calls from external IP addresses using compromised cloud credentials

Detection Strategies

• Monitor TeamCity application logs for exceptions related to Cloud Profiles functionality
• Implement web application firewall rules to detect unusual request patterns targeting Cloud Profiles endpoints
• Enable cloud provider audit logging to identify credential usage from unexpected sources
• Deploy network monitoring to detect data exfiltration attempts following credential exposure

Monitoring Recommendations

• Configure alerting for failed authentication attempts in connected cloud environments
• Implement log aggregation for TeamCity servers to centralize exception monitoring
• Enable SentinelOne Singularity platform to monitor for post-exploitation activities associated with credential theft
• Review cloud provider activity logs for unauthorized resource access or configuration changes

How to Mitigate CVE-2025-31141

Immediate Actions Required

• Upgrade JetBrains TeamCity to version 2025.03 or later immediately
• Rotate all cloud provider credentials configured in TeamCity Cloud Profiles
• Review access logs for evidence of exploitation prior to patching
• Restrict network access to TeamCity administrative interfaces to trusted networks only

Patch Information

JetBrains has addressed this vulnerability in TeamCity version 2025.03. Organizations should upgrade to this version or later to remediate the credential leakage issue. The patch implements proper sanitization of sensitive information in exception handling paths, preventing credentials from being exposed in error messages.

For official patch details and download links, refer to the JetBrains Security Issues Fixed page.

Workarounds

• Implement network segmentation to limit access to TeamCity servers from untrusted networks
• Configure a reverse proxy with request filtering to block potentially malicious requests to Cloud Profiles endpoints
• Temporarily disable Cloud Profiles functionality if not immediately required until patching can be completed
• Enable enhanced logging and monitoring to detect exploitation attempts while awaiting patch deployment

# Example: Restrict TeamCity access via firewall
# Allow only trusted IP ranges to access TeamCity
iptables -A INPUT -p tcp --dport 8111 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 8111 -j DROP

# Rotate cloud credentials after patching (example for AWS)
aws iam create-access-key --user-name teamcity-service-account
aws iam delete-access-key --user-name teamcity-service-account --access-key-id OLD_KEY_ID