CVE-2020-7654 in snyk-broker
Summary
by MITRE
All versions of snyk-broker before 4.73.1 are vulnerable to Information Exposure. It logs private keys if logging level is set to DEBUG.
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Analysis
by VulDB Data Team • 05/30/2020
The vulnerability identified as CVE-2020-7654 affects snyk-broker versions prior to 4.73.1 and represents a critical information exposure flaw that compromises sensitive cryptographic materials. This vulnerability arises from improper logging practices within the software's debugging functionality, where private keys are inadvertently recorded in log files when the system operates under debug logging levels. The issue manifests when developers or administrators configure the application to operate in debug mode for troubleshooting purposes, unknowingly creating persistent exposure points for sensitive credentials.
The technical implementation of this vulnerability stems from inadequate input validation and output sanitization within the logging subsystem of snyk-broker. When debug logging is enabled, the application fails to properly filter or redact sensitive information from its output streams, allowing private cryptographic keys to be written to log files alongside other operational data. This represents a classic security misconfiguration that violates fundamental principles of secure coding practices and information hiding. The flaw aligns with CWE-209, which specifically addresses information exposure through improper error handling and logging mechanisms, and demonstrates how seemingly innocuous debugging features can create significant security risks.
The operational impact of this vulnerability extends beyond simple credential exposure, as private keys represent critical assets that can be exploited by malicious actors to gain unauthorized access to protected systems and data. Once an attacker obtains these private keys through log file access, they can potentially impersonate legitimate users, decrypt sensitive communications, or establish persistent access to affected environments. The vulnerability particularly affects organizations that maintain debug logging enabled in production environments or those that do not properly secure their log file access controls. This exposure can lead to cascading security incidents including data breaches, unauthorized system access, and potential compliance violations under various regulatory frameworks such as gdpr, hipaa, and pci dss.
Organizations should immediately implement mitigations including upgrading to snyk-broker version 4.73.1 or later, which addresses this vulnerability through proper logging sanitization. Additional protective measures involve configuring the application to disable debug logging in production environments, implementing strict access controls on log files, and establishing regular log review procedures to detect potential exposure incidents. Security teams should also consider implementing automated monitoring solutions that can identify and alert on sensitive information appearing in log files. The vulnerability demonstrates the importance of adhering to the principle of least privilege in logging configurations and highlights the need for comprehensive security testing that includes review of debugging and logging functionality. This issue relates to ATT&CK technique T1562.001 which covers "T1562.001 - Impair Defenses: Disable or Modify Tools" and emphasizes how insecure logging practices can undermine security controls through information leakage rather than direct exploitation.