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Attack Tree Analysis for asciinema/asciinema-player

Objective: Execute Arbitrary JavaScript in Application Context (via asciinema-player)

Attack Tree Visualization

                                      Execute Arbitrary JavaScript
                                      in Application Context
                                      (via asciinema-player)
                                                ^
                                                |
                                 +--------------------------------+
                                 |                                |
                         *Malicious Cast File*                  Vulnerable Player Version
                                 ^
                                 |
                 +---------------+---------------+        +-------+
                 |               |               |        |
     Escape Sequence Injection  VT Sequence      **Data URI**    *Known CVEs*
     (CSI, OSC, etc.)       Manipulation    **in src**     *(e.g., XSS)*
                                                +--------+
                                                |
                                             **Insecure**
                                             **Content-Security-Policy**
                                             **(CSP)**

Attack Tree Path: Malicious Cast File (High-Risk Path)

This path represents attacks that leverage a compromised or attacker-controlled .cast file.

  • Escape Sequence Injection (CSI, OSC, etc.):

    • Description: The attacker crafts a .cast file containing malicious ANSI escape sequences (CSI, OSC, etc.). These sequences, if not properly sanitized by asciinema-player, could be used to manipulate the terminal's behavior and, potentially, interact with the DOM in a way that leads to JavaScript execution. This is an indirect attack, relying on the player's internal handling of these sequences.
    • Likelihood: Medium to High
    • Impact: High (Potential for XSS)
    • Effort: Medium
    • Skill Level: Medium to High
    • Detection Difficulty: Medium to High

  • VT Sequence Manipulation:

    • Description: Similar to escape sequence injection, but focuses on Virtual Terminal (VT) sequences. The attacker uses malformed or malicious VT sequences within the .cast file to trigger unexpected behavior in the player, aiming for code execution.
    • Likelihood: Medium
    • Impact: High (Potential for XSS)
    • Effort: Medium to High
    • Skill Level: Medium to High
    • Detection Difficulty: High

  • Data URI in src (Critical Node):

    • Description: The attacker provides a data: URI as the src attribute of the asciinema-player element. This data: URI contains malicious JavaScript disguised as a .cast file. If the application doesn't validate the src attribute and allows user-supplied values, the attacker can directly execute arbitrary JavaScript.
    • Likelihood: Low to Very High (depending entirely on application implementation)
    • Impact: Very High (Direct JavaScript execution)
    • Effort: Very Low
    • Skill Level: Low
    • Detection Difficulty: Low to Medium

Attack Tree Path: Vulnerable Player Version (High-Risk Path)

  • Known CVEs (e.g., XSS) (High-Risk and Critical):
    • Description: The application uses an outdated version of asciinema-player with known, publicly disclosed vulnerabilities (CVEs), particularly those related to Cross-Site Scripting (XSS). The attacker leverages these known vulnerabilities to execute arbitrary JavaScript.
    • Likelihood: Medium
    • Impact: High to Very High
    • Effort: Low to Medium
    • Skill Level: Low to Medium
    • Detection Difficulty: Low

Attack Tree Path: Configuration Issues

  • Insecure Content-Security-Policy (CSP) (Critical Node):
    • Description: The application has a weak, misconfigured, or missing Content-Security-Policy (CSP). A weak CSP (e.g., one that allows unsafe-inline for scripts) significantly reduces the difficulty of exploiting XSS vulnerabilities, regardless of their origin. It acts as a force multiplier for other vulnerabilities.
    • Likelihood: Medium to High
    • Impact: (Indirect) High (Amplifies the impact of other vulnerabilities)
    • Effort: Very Low
    • Skill Level: Low
    • Detection Difficulty: Low