Skip to content

Latest commit

 

History

History
99 lines (79 loc) · 7.21 KB

policy.md

File metadata and controls

99 lines (79 loc) · 7.21 KB

Policy Logic Issues

Components and Files:

  • chrome/browser/enterprise/browser_management/browser_management_status_provider.cc
  • chrome/browser/policy/profile_policy_connector.cc
  • components/policy/core/common/policy_map.cc
  • components/policy/core/common/policy_service.cc
  • components/policy/core/common/policy_service_impl.cc
  • components/policy/core/common/policy_loader_win.cc
  • components/policy/core/common/policy_loader_mac.mm
  • components/policy/core/common/schema_registry.cc
  • components/policy/core/common/cloud/cloud_policy_manager.cc
  • components/policy/core/common/policy_utils.cc
  • components/policy/core/common/policy_proto_decoders.cc
  • components/policy/core/common/proxy_policy_provider.cc
  • components/policy/core/browser/browser_policy_connector.cc
  • components/policy/content/policy_blocklist_navigation_throttle.cc

This document analyzes Chromium's policy handling, focusing on the PolicyMap class in components/policy/core/common/policy_map.cc.

Potential Logic Flaws:

  • Arbitrary Code Execution: Improper policy handling could allow code execution.
  • Data Leakage: Sensitive data could be leaked through policy handling. The handling of policy data in policy_map.cc needs to be reviewed for potential data leakage vulnerabilities.
  • Denial-of-Service (DoS): Policy manipulation could lead to DoS. The policy handling logic should be reviewed for potential denial-of-service vulnerabilities.
  • Cross-Origin Issues: Improper handling of cross-origin policies could lead to vulnerabilities.
  • Input Validation: Insufficient input validation could allow injection attacks. The Set and LoadFrom functions in policy_map.cc handle policy data and need to be reviewed for proper input validation and sanitization.
  • Policy Setting and Merging: Incorrect handling of policy setting and merging could allow malicious policies to override legitimate policies or introduce inconsistencies. The Set, MergeFrom, and MergePolicy functions in policy_map.cc are crucial for secure policy management.
  • Unsafe Value Access: The GetValueUnsafe and GetMutableValueUnsafe functions bypass policy checks and could be exploited to access or modify sensitive data. These functions' usage needs careful review.

Further Analysis and Potential Issues (Updated):

  • Race Conditions: Asynchronous policy fetching and interactions with multiple components introduce race condition risks. Implement synchronization. The interaction between different policy providers and the policy service needs careful analysis for potential race conditions.
  • Policy Enforcement Bypass: Malformed policy configurations could bypass restrictions. Implement robust policy validation. The policy validation logic in policy_map.cc and other policy-related files needs to be strengthened.
  • Data Validation: Validate all policy data before use. Thorough data validation is essential. The handling of policy values in policy_map.cc should be reviewed.
  • Access Control: Implement access control to prevent unauthorized policy modification. The access control mechanisms for policy data need to be reviewed and strengthened.
  • Security Auditing: Add logging/auditing to track policy changes and access. Comprehensive logging and auditing are crucial.
  • Policy Tampering: Analyze potential for policy tampering. Implement detection and prevention mechanisms.
  • Denial-of-Service: Assess DoS vulnerability. Implement error handling and rate limiting.
  • Policy Map Handling: The PolicyMap class in policy_map.cc is central to policy management. Key functions include Set, LoadFrom, MergeFrom, MergePolicy, GetValueUnsafe, GetMutableValueUnsafe, IsPolicySet, SetSourceForAll, and SetAllInvalid. Potential security vulnerabilities include insecure policy setting and overriding, improper policy loading, vulnerabilities in policy merging, unsafe value access, and misuse of policy modification functions.

Policy Blocklist Navigation Throttle:

  • Blocklist/Allowlist Handling: Review blocklist/allowlist handling for bypasses.
  • Safe Browsing Interaction: Review Safe Browsing interaction for security.
  • Asynchronous Operations: Review asynchronous operations for race conditions.
  • Error Handling: Review error handling for security and information leakage.
  • Input Validation: Implement URL input validation.

Areas Requiring Further Investigation (Updated):

  • Race Condition Mitigation: Implement synchronization.
  • Policy Enforcement Bypass: Implement robust policy validation.
  • Data Validation: Implement robust data validation.
  • Access Control: Implement access control mechanisms.
  • Security Auditing: Implement logging and auditing.
  • URL Handling: Implement URL input validation and sanitization.
  • Error Handling: Improve error handling and provide informative messages.
  • Cloud Policy Security: Review cloud policy management.
  • Policy Proto Decoding: Implement data validation and error handling in protobuf decoding.
  • Proxy Policy Handling: Review proxy policy provider security.
  • Registry Access Security: Implement error handling and access control for registry access.
  • Input Validation: Implement robust input validation for all policy data.
  • Concurrency Control: Implement locking to prevent race conditions.
  • Timing Attack Mitigation: Review code for timing attacks.
  • Policy Blocklist Navigation Throttle: Review policy_blocklist_navigation_throttle.cc.
  • Policy Conflicts and Precedence: The logic for handling policy conflicts and precedence needs further analysis to ensure that higher-priority policies are correctly enforced and that conflicts are resolved securely.
  • External Data Fetchers: The interaction with external data fetchers should be reviewed for potential vulnerabilities related to unauthorized access or data leakage.

CVE Analysis and Relevance:

(See previous response)

Secure Contexts and Policy:

Policy enforcement is crucial. Vulnerabilities could allow bypasses or manipulation. Robust validation, access control, and error handling are essential.

Privacy Implications:

Policies can impact user privacy. The design and implementation should consider privacy implications. Protect user privacy and provide granular control.

Files Reviewed:

  • chrome/browser/enterprise/browser_management/browser_management_status_provider.cc
  • chrome/browser/policy/profile_policy_connector.cc
  • components/policy/core/common/policy_map.cc
  • components/policy/core/common/policy_service.cc
  • components/policy/core/common/policy_service_impl.cc
  • components/policy/core/common/policy_loader_win.cc
  • components/policy/core/common/policy_loader_mac.mm
  • components/policy/core/common/schema_registry.cc
  • components/policy/core/common/cloud/cloud_policy_manager.cc
  • components/policy/core/common/policy_utils.cc
  • components/policy/core/common/policy_proto_decoders.cc
  • components/policy/core/common/proxy_policy_provider.cc
  • components/policy/core/browser/browser_policy_connector.cc
  • components/policy/content/policy_blocklist_navigation_throttle.cc