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Attack Tree Analysis for serbanghita/mobile-detect

Objective: Compromise application logic and potentially gain unauthorized access or cause application malfunction by exploiting vulnerabilities or weaknesses in the mobile-detect library.

Attack Tree Visualization

[CRITICAL NODE] Compromise Application via Mobile-Detect Exploitation [CRITICAL NODE] [HIGH-RISK PATH] ├───(AND) [CRITICAL NODE] Bypass Mobile Detection Logic [CRITICAL NODE] [HIGH-RISK PATH] │ ├───(OR) [CRITICAL NODE] 1. Crafted User-Agent String [CRITICAL NODE] [HIGH-RISK PATH] │ │ ├─── [CRITICAL NODE] 1.1. Spoofing Device Type [CRITICAL NODE] [HIGH-RISK PATH] │ │ │ └─── [CRITICAL NODE] 1.1.1. Emulate Desktop User-Agent on Mobile [CRITICAL NODE] [HIGH-RISK PATH] │ │ │ └─── [CRITICAL NODE] 1.1.2. Emulate Mobile User-Agent on Desktop [CRITICAL NODE] [HIGH-RISK PATH] │ │ │ └─── [CRITICAL NODE] 1.1.3. Emulate Specific Device/OS for Targeted Behavior [CRITICAL NODE] [HIGH-RISK PATH] │ │ ├─── 1.2.2. Cause Regex Denial of Service (ReDoS) (Less likely but possible) [HIGH-RISK PATH] │ └───(OR) [CRITICAL NODE] 4. Cause Application Malfunction or Incorrect Behavior [CRITICAL NODE] [HIGH-RISK PATH] │ ├─── [CRITICAL NODE] 4.1. Incorrect Content Rendering/Functionality [CRITICAL NODE] [HIGH-RISK PATH] │ │ └─── [CRITICAL NODE] 4.1.1. Application Serves Wrong Version of Website/App [CRITICAL NODE] [HIGH-RISK PATH] │ │ └─── [CRITICAL NODE] 4.1.2. Broken Layout or UI due to Incorrect Device Detection [CRITICAL NODE] [HIGH-RISK PATH] │ ├─── [CRITICAL NODE] 4.2. Logic Errors due to Misdetection [CRITICAL NODE] [HIGH-RISK PATH] │ │ └─── [CRITICAL NODE] 4.2.1. Application Logic Branches Incorrectly based on mobile-detect output [CRITICAL NODE] [HIGH-RISK PATH] │ └─── 4.3. Denial of Service (Indirect, less likely via mobile-detect itself, more likely via ReDoS) [HIGH-RISK PATH] │ └─── 4.3.1. Trigger Regex Denial of Service (If vulnerable regex patterns exist and can be exploited) [HIGH-RISK PATH] └───(AND) [CRITICAL NODE] Exploit Misdetection for Malicious Purposes [CRITICAL NODE] [HIGH-RISK PATH] ├───(OR) [CRITICAL NODE] 3. Gain Unauthorized Access to Features/Content [CRITICAL NODE] [HIGH-RISK PATH] │ ├─── [CRITICAL NODE] 3.1. Access Mobile-Only Features on Desktop (Spoof Mobile UA) [CRITICAL NODE] [HIGH-RISK PATH] │ │ └─── [CRITICAL NODE] 3.1.1. Bypass Mobile-Specific Security Checks (If any rely solely on mobile-detect) [CRITICAL NODE] [HIGH-RISK PATH] │ ├─── [CRITICAL NODE] 3.2. Access Desktop-Only Features on Mobile (Spoof Desktop UA) [CRITICAL NODE] [HIGH-RISK PATH] │ │ └─── [CRITICAL NODE] 3.2.1. Bypass Desktop-Specific Security Checks (If any rely solely on mobile-detect) [CRITICAL NODE] [HIGH-RISK PATH] │ └─── [CRITICAL NODE] 3.3. Bypass Device-Specific Feature Gating [CRITICAL NODE] [HIGH-RISK PATH] │ └─── [CRITICAL NODE] 3.3.1. Access Features Intended for Different Device Types [CRITICAL NODE] [HIGH-RISK PATH]

Attack Tree Path: Root Node: [CRITICAL NODE] Compromise Application via Mobile-Detect Exploitation [CRITICAL NODE]

  • Attack Vector: This is the ultimate goal. The attacker aims to negatively impact the application by exploiting weaknesses related to mobile-detect.
  • Why High-Risk: Success can lead to various negative outcomes, from minor UX issues to unauthorized access and application malfunction.
  • Mitigation: Implement robust security measures throughout the application, especially those independent of client-side device detection.

Attack Tree Path: Bypass Mobile Detection Logic [CRITICAL NODE]

  • Attack Vector: The attacker must first circumvent the device detection logic of mobile-detect to proceed with further attacks.
  • Techniques: Primarily through crafting User-Agent strings or potentially exploiting ReDoS vulnerabilities.
  • Why High-Risk: Bypassing detection is a prerequisite for many other attacks in this model.
  • Mitigation: Recognize that client-side detection is easily bypassed and avoid relying on it for security.

Attack Tree Path: 1. Crafted User-Agent String [CRITICAL NODE]

  • Attack Vector: Manipulating the User-Agent string sent by the client's browser to influence mobile-detect's output.
  • Techniques:
    • 1.1. Spoofing Device Type [CRITICAL NODE]: Changing the User-Agent to mimic a different device.
      • 1.1.1. Emulate Desktop User-Agent on Mobile [CRITICAL NODE]: Make a mobile device appear as a desktop.
      • 1.1.2. Emulate Mobile User-Agent on Desktop [CRITICAL NODE]: Make a desktop device appear as a mobile.
      • 1.1.3. Emulate Specific Device/OS for Targeted Behavior [CRITICAL NODE]: Craft a User-Agent for a specific device/OS.
  • Why High-Risk: Extremely easy to execute, requires minimal skill, and is often undetectable client-side.
  • Mitigation: Never trust User-Agent for security. Use device detection only for UX enhancements.

Attack Tree Path: 1.2.2. Cause Regex Denial of Service (ReDoS) [HIGH-RISK PATH]

  • Attack Vector: Crafting User-Agent strings that exploit vulnerable regular expressions in mobile-detect to cause a Denial of Service.
  • Techniques: Analyzing regex patterns and creating User-Agent strings that lead to catastrophic backtracking or excessive CPU consumption.
  • Why High-Risk: While less likely, successful ReDoS can lead to significant application downtime and impact availability.
  • Mitigation: Regularly review and test regex patterns (in mobile-detect updates or custom regex if used). Implement rate limiting and monitoring for DoS symptoms.

Attack Tree Path: Cause Application Malfunction or Incorrect Behavior [CRITICAL NODE]

  • Attack Vector: Exploiting misdetection to cause the application to behave incorrectly or malfunction.
  • Techniques:
    • 4.1. Incorrect Content Rendering/Functionality [CRITICAL NODE]: Application serves wrong content or has broken UI due to misdetection.
      • 4.1.1. Application Serves Wrong Version of Website/App [CRITICAL NODE]: Mobile version on desktop or vice versa.
      • 4.1.2. Broken Layout or UI due to Incorrect Device Detection [CRITICAL NODE]: Layout breaks due to incorrect device assumption.
    • 4.2. Logic Errors due to Misdetection [CRITICAL NODE]: Application logic branches incorrectly based on misdetection.
      • 4.2.1. Application Logic Branches Incorrectly based on mobile-detect output [CRITICAL NODE]: Conditional logic executes wrong code path.
    • 4.3. Denial of Service (Indirect) [HIGH-RISK PATH]: Triggering ReDoS via crafted User-Agent strings.
      • 4.3.1. Trigger Regex Denial of Service [HIGH-RISK PATH]: As described in 1.2.2.
  • Why High-Risk: Malfunction can degrade user experience, lead to data processing errors, and in the case of DoS, disrupt application availability.
  • Mitigation: Thoroughly test application behavior with various User-Agent strings. Implement robust error handling and fallback mechanisms. For ReDoS, monitor for DoS symptoms and consider regex optimization if feasible (though less control over mobile-detect regex).

Attack Tree Path: Exploit Misdetection for Malicious Purposes [CRITICAL NODE]

  • Attack Vector: Leveraging misdetection to gain unauthorized access or manipulate application behavior for malicious gain.
  • Why High-Risk: Can lead to security breaches and unauthorized access to features or data.
  • Mitigation: Never rely on mobile-detect for access control. Implement strong server-side authorization mechanisms.

Attack Tree Path: Gain Unauthorized Access to Features/Content [CRITICAL NODE]

  • Attack Vector: Using misdetection to access features or content intended for different device types.
  • Techniques:
    • 3.1. Access Mobile-Only Features on Desktop [CRITICAL NODE]: Spoofing mobile User-Agent on desktop.
      • 3.1.1. Bypass Mobile-Specific Security Checks [CRITICAL NODE]: Circumventing weak security checks based solely on mobile-detect.
    • 3.2. Access Desktop-Only Features on Mobile [CRITICAL NODE]: Spoofing desktop User-Agent on mobile.
      • 3.2.1. Bypass Desktop-Specific Security Checks [CRITICAL NODE]: Circumventing weak security checks based solely on mobile-detect.
    • 3.3. Bypass Device-Specific Feature Gating [CRITICAL NODE]: General bypass of feature gating based on device type.
      • 3.3.1. Access Features Intended for Different Device Types [CRITICAL NODE]: Accessing features not meant for the user's actual device.
  • Why High-Risk: Direct security impact, potentially leading to data breaches or unauthorized actions.
  • Mitigation: Implement server-side security checks and authorization that are independent of device detection. Use role-based access control and other robust security mechanisms.