CVE-2022-38133 in TeamCity
Summary
by MITRE • 08/10/2022
In JetBrains TeamCity before 2022.04.3 the private SSH key could be written to the server log in some cases
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Analysis
by VulDB Data Team • 09/04/2022
The vulnerability identified as CVE-2022-38133 affects JetBrains TeamCity versions prior to 2022.04.3 and represents a critical logging security flaw that could potentially expose sensitive authentication credentials. This issue specifically involves the improper handling of private SSH keys within the application's logging mechanisms, creating a significant risk for organizations relying on TeamCity for continuous integration and deployment operations. The vulnerability falls under the broader category of information exposure through logging, which is classified as CWE-209 in the Common Weakness Enumeration catalog, indicating a weakness where sensitive information is logged in a manner that could be accessed by unauthorized parties.
The technical flaw manifests when TeamCity processes SSH key authentication for repository access or other secure operations, where the private SSH key material gets inadvertently written to server log files instead of being properly sanitized or masked during the logging process. This occurs due to insufficient input validation and output sanitization within the logging subsystem that handles SSH key operations. When the system encounters certain error conditions or performs specific authentication workflows, the private key components are included in log entries without proper obfuscation, creating a situation where unauthorized individuals with access to system logs can extract complete private key material. This vulnerability is particularly concerning because SSH keys serve as the primary authentication mechanism for secure remote access and repository operations in CI/CD environments.
The operational impact of this vulnerability extends beyond simple credential exposure, as it fundamentally compromises the security posture of organizations using TeamCity for their automation infrastructure. Attackers who gain access to server logs could extract private SSH keys and use them to gain unauthorized access to source code repositories, deployment systems, and other sensitive infrastructure components that rely on SSH key authentication. The implications are severe because these keys often have broad access permissions and can be used to compromise entire development and production environments. The vulnerability affects the principle of least privilege and can lead to lateral movement within networks, as compromised keys may grant access to multiple systems that share the same authentication infrastructure. This aligns with tactics described in the MITRE ATT&CK framework under the credential access and privilege escalation domains, where attackers can leverage exposed credentials to maintain persistent access to target systems.
Organizations should immediately implement mitigations including updating to JetBrains TeamCity version 2022.04.3 or later, which contains the necessary patches to prevent private SSH key material from being written to logs. Additionally, system administrators should conduct comprehensive log reviews to identify and remove any previously exposed SSH key material from log files and implement proper log sanitization policies. The remediation process should include configuring logging systems to mask or redact sensitive information before it is written to persistent storage, and establishing monitoring procedures to detect anomalous log patterns that might indicate credential exposure. Security teams should also consider implementing additional controls such as key rotation procedures for any SSH keys that may have been exposed and enhanced access controls on log files to prevent unauthorized access to sensitive system information.