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attack-surface.md

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Attack Surface Analysis for docusealco/docuseal

Attack Surface: Malicious File Upload

  • Description: Attackers upload malicious files to the application.
  • Docuseal Contribution: Docuseal's core document upload feature for signing and management directly enables this attack vector, making it a primary concern.
  • Example: An attacker uploads a specially crafted PDF file designed to exploit a vulnerability in Docuseal's PDF processing library, leading to Remote Code Execution on the server.
  • Impact: Remote Code Execution, Denial of Service, Cross-Site Scripting, Data Exfiltration.
  • Risk Severity: Critical
  • Mitigation Strategies:
    • Developers:
      • Implement rigorous file validation (type, magic number, extension).
      • Sanitize uploaded files to remove potentially malicious content.
      • Utilize secure and updated document parsing libraries.
      • Enforce strict file size limits.
      • Sandbox document processing to isolate potential exploits.
      • Implement Content Security Policy (CSP) to mitigate XSS.

Attack Surface: Document Parsing Vulnerabilities

  • Description: Vulnerabilities within document parsing libraries are exploited via crafted documents.
  • Docuseal Contribution: Docuseal relies on parsing libraries to process uploaded documents for rendering, signing, and content extraction, making it directly vulnerable to flaws in these libraries.
  • Example: A crafted DOCX file exploits a buffer overflow in Docuseal's DOCX parsing library, allowing an attacker to execute arbitrary code on the Docuseal server.
  • Impact: Remote Code Execution, Denial of Service, Information Disclosure.
  • Risk Severity: Critical
  • Mitigation Strategies:
    • Developers:
      • Employ well-maintained and actively patched document parsing libraries.
      • Keep parsing libraries updated to the latest security versions.
      • Validate and sanitize input before parsing.
      • Consider sandboxing or containerization for parsing processes.
      • Conduct regular security audits and penetration testing of document processing.

Attack Surface: Insufficient Access Control on Documents

  • Description: Unauthorized users gain access to sensitive documents due to flawed access controls.
  • Docuseal Contribution: Docuseal's document management and user permission system is central to its security. Weak or flawed access control directly exposes sensitive documents.
  • Example: A vulnerability in Docuseal's permission logic allows a standard user to access and download confidential documents intended only for administrators or users in different departments.
  • Impact: Data Breach, Data Tampering, Unauthorized Actions, Confidentiality Violation.
  • Risk Severity: High
  • Mitigation Strategies:
    • Developers:
      • Implement robust Role-Based Access Control (RBAC) or Attribute-Based Access Control (ABAC).
      • Adhere to the principle of least privilege.
      • Thoroughly test access control mechanisms for privilege escalation.
      • Regularly audit access control configurations and user permissions.
      • Implement logging and monitoring of document access attempts.

Attack Surface: Signature Forgery or Manipulation

  • Description: Digital signatures can be forged or manipulated, undermining document integrity and trust.
  • Docuseal Contribution: Docuseal's core function is digital document signing. Vulnerabilities in its signature implementation directly compromise the fundamental security promise of the application.
  • Example: A flaw in Docuseal's signature verification process allows an attacker to subtly alter a signed document while the signature still validates as legitimate, or to create a valid signature without proper authorization.
  • Impact: Integrity Violation, Repudiation of Signatures, Legal and Business Consequences, Financial Loss.
  • Risk Severity: Critical
  • Mitigation Strategies:
    • Developers:
      • Utilize established and secure digital signature libraries and standards.
      • Implement strong signature verification processes.
      • Ensure secure management of cryptographic keys and certificates (consider HSMs).
      • Regularly audit signature implementation and cryptographic components.

Attack Surface: Insecure Default Configurations

  • Description: Docuseal is deployed with insecure default settings, making it easily exploitable.
  • Docuseal Contribution: If Docuseal ships with weak default configurations (e.g., default admin credentials), it directly creates a readily exploitable entry point for attackers.
  • Example: Docuseal is deployed with default administrator credentials that are publicly known or easily guessable. An attacker uses these credentials to gain administrative access and compromise the entire Docuseal instance.
  • Impact: Unauthorized Access, System Compromise, Data Breach.
  • Risk Severity: High
  • Mitigation Strategies:
    • Developers:
      • Avoid shipping with default credentials.
      • Force users to set strong, unique credentials during initial setup.
      • Disable debug mode and unnecessary features by default in production.
      • Provide clear and comprehensive secure configuration guidelines.
      • Harden default configurations based on security best practices.
    • Users:
      • Immediately change all default credentials upon installation.
      • Review and harden default configurations according to security guidelines.
      • Disable any unnecessary features or services.