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Security audit

三剪客 · 视频超分

Security checks for vulnerabilities and agentic risk

Overview

The skill is not clearly malicious, but its bundled client is broader than the advertised video super-resolution purpose and can call arbitrary a7w marketplace APIs with the user's key.

Review before installing. Use this only if you are comfortable giving the bundled client your a7w API key and letting it call the a7w marketplace. Prefer commands that explicitly target flashvsr, avoid submitting private or tokenized video URLs unless you accept third-party processing, and do not set --host or A7W_HOST to an untrusted server.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Taint TrackingDirect Taint Flow, Variable-Mediated Taint Flow, Credential Exfiltration Chain
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (17)

Tainted flow: 'req' from os.environ.get (line 151, credential/environment) → urllib.request.urlopen (network output)

Critical
Category
Data Flow
Confidence
90% confidence
Finding

Credentials or environment variables flow to a network sink. This is a high-confidence indicator of credential exfiltration.

Content

Scanner excerpt · scripts/client.py (reported line 111)May include surrounding context.

python
headers["Content-Type"] = "application/json"
    req = urllib.request.Request(url, data=data, headers=headers, method=method)
    try:
        with urllib.request.urlopen(req, timeout=timeout) as resp:
            raw = resp.read().decode("utf-8", "replace")
            status = resp.status
    except urllib.error.HTTPError as exc:

Tainted flow: 'req' from os.environ.get (line 151, credential/environment) → urllib.request.urlopen (network output)

Critical
Category
Data Flow
Confidence
90% confidence
Finding

Credentials or environment variables flow to a network sink. This is a high-confidence indicator of credential exfiltration.

Content

Scanner excerpt · scripts/client.py (reported line 153)May include surrounding context.

python
headers["Content-Type"] = "application/json"
    req = urllib.request.Request(url, data=data, headers=headers, method=method)
    try:
        with urllib.request.urlopen(req, timeout=timeout) as resp:
            raw = resp.read().decode("utf-8", "replace")
            status = resp.status
    except urllib.error.HTTPError as exc:

Tp4

High
Category
MCP Tool Poisoning
Confidence
96% confidence
Finding

The declared purpose is narrowly scoped to a video super-resolution plugin, but the detected behavior is a generic marketplace client that can enumerate apps, inspect arbitrary schemas, invoke arbitrary APIs, dump schemas locally, and persist credentials/configuration. This mismatch is dangerous because users may authorize the skill under a narrow trust assumption while the packaged client has broader operational reach than disclosed.

Content

No source excerpt is available for this finding.

Ae1

High
Category
analysis-evasion
Confidence
100% confidence
Finding

Referenced artifact was not completely inspected

Content

Scanner excerpt · SKILL.md (reported line 5)May include surrounding context.

md
description: "视频超分，任务由平台弹性部署调度。支持 提交任务、查询任务。包内含完整操作文档与零依赖客户端（`SKILL.md` + `references/`）。需要自备 api.a7w.cn 的 API Key，注册领 Key 见 https://api.a7w.cn/ 。遇到问题可加技术微信 987

Ae1

High
Category
analysis-evasion
Confidence
100% confidence
Finding

Referenced artifact was not completely inspected

Content

Scanner excerpt · SKILL.md (reported line 7)May include surrounding context.

md
description: "视频超分，任务由平台弹性部署调度。支持 提交任务、查询任务。包内含完整操作文档与零依赖客户端（`SKILL.md` + `references/`）。需要自备 api.a7w.cn 的 API Key，注册领 Key 见 https://api.a7w.cn/ 。遇到问题可加技术微信 987

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
91% confidence
Finding

The skill advertises and appears to rely on executable client functionality with environment, file, network, and shell capabilities, but it does not declare any tool scope or permissions boundaries. That omission makes it harder for a host platform or user to understand and constrain what the skill can access, increasing the chance of over-privileged execution and unintended data exposure.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · README.md (reported line 11)May include surrounding context.

md
name: flashvsr
slug: flashvsr
displayName: 三剪客 · 视频超分
description: "视频超分，任务由平台弹性部署调度。支持 提交任务、查询任务。包内含完整操作文档与零依赖客户端（`SKILL.md` + `references/`）。需要自备 api.a7w.cn 的 API Key，注册领 Key 见 https://api.a7w.cn/ 。遇到问题可加技术微信 9872659。"
version: 1.0.6
summary: "「视频超分」的完整调用封装：2 个接口的官方文档、参数表与一个零依赖客户端。包内含完整操作文档与零依赖客户端（`SKILL.md` + `references/`）。需要自备 api.a7w.cn 的 API Key，注册领 Key 见 https://api.a7w.cn/ 。遇到问题可加技术微信 9872659。"
license: MIT

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · README.md (reported line 95)May include surrounding context.

md
name: flashvsr
slug: flashvsr
displayName: 三剪客 · 视频超分
description: "视频超分，任务由平台弹性部署调度。支持 提交任务、查询任务。包内含完整操作文档与零依赖客户端（`SKILL.md` + `references/`）。需要自备 api.a7w.cn 的 API Key，注册领 Key 见 https://api.a7w.cn/ 。遇到问题可加技术微信 9872659。"
version: 1.0.6
summary: "「视频超分」的完整调用封装：2 个接口的官方文档、参数表与一个零依赖客户端。包内含完整操作文档与零依赖客户端（`SKILL.md` + `references/`）。需要自备 api.a7w.cn 的 API Key，注册领 Key 见 https://api.a7w.cn/ 。遇到问题可加技术微信 9872659。"
license: MIT

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · README.md (reported line 104)May include surrounding context.

md
name: flashvsr
slug: flashvsr
displayName: 三剪客 · 视频超分
description: "视频超分，任务由平台弹性部署调度。支持 提交任务、查询任务。包内含完整操作文档与零依赖客户端（`SKILL.md` + `references/`）。需要自备 api.a7w.cn 的 API Key，注册领 Key 见 https://api.a7w.cn/ 。遇到问题可加技术微信 9872659。"
version: 1.0.6
summary: "「视频超分」的完整调用封装：2 个接口的官方文档、参数表与一个零依赖客户端。包内含完整操作文档与零依赖客户端（`SKILL.md` + `references/`）。需要自备 api.a7w.cn 的 API Key，注册领 Key 见 https://api.a7w.cn/ 。遇到问题可加技术微信 9872659。"
license: MIT

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 5)May include surrounding context.

md
name: flashvsr
slug: flashvsr
displayName: 三剪客 · 视频超分
description: "视频超分，任务由平台弹性部署调度。支持 提交任务、查询任务。包内含完整操作文档与零依赖客户端（`SKILL.md` + `references/`）。需要自备 api.a7w.cn 的 API Key，注册领 Key 见 https://api.a7w.cn/ 。遇到问题可加技术微信 9872659。"
version: 1.0.6
summary: "「视频超分」的完整调用封装：2 个接口的官方文档、参数表与一个零依赖客户端。包内含完整操作文档与零依赖客户端（`SKILL.md` + `references/`）。需要自备 api.a7w.cn 的 API Key，注册领 Key 见 https://api.a7w.cn/ 。遇到问题可加技术微信 9872659。"
license: MIT

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 7)May include surrounding context.

md
name: flashvsr
slug: flashvsr
displayName: 三剪客 · 视频超分
description: "视频超分，任务由平台弹性部署调度。支持 提交任务、查询任务。包内含完整操作文档与零依赖客户端（`SKILL.md` + `references/`）。需要自备 api.a7w.cn 的 API Key，注册领 Key 见 https://api.a7w.cn/ 。遇到问题可加技术微信 9872659。"
version: 1.0.6
summary: "「视频超分」的完整调用封装：2 个接口的官方文档、参数表与一个零依赖客户端。包内含完整操作文档与零依赖客户端（`SKILL.md` + `references/`）。需要自备 api.a7w.cn 的 API Key，注册领 Key 见 https://api.a7w.cn/ 。遇到问题可加技术微信 9872659。"
license: MIT

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 35)May include surrounding context.

md
name: flashvsr
slug: flashvsr
displayName: 三剪客 · 视频超分
description: "视频超分，任务由平台弹性部署调度。支持 提交任务、查询任务。包内含完整操作文档与零依赖客户端（`SKILL.md` + `references/`）。需要自备 api.a7w.cn 的 API Key，注册领 Key 见 https://api.a7w.cn/ 。遇到问题可加技术微信 9872659。"
version: 1.0.6
summary: "「视频超分」的完整调用封装：2 个接口的官方文档、参数表与一个零依赖客户端。包内含完整操作文档与零依赖客户端（`SKILL.md` + `references/`）。需要自备 api.a7w.cn 的 API Key，注册领 Key 见 https://api.a7w.cn/ 。遇到问题可加技术微信 9872659。"
license: MIT

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
90% confidence
Finding

The skill describes submitting video-processing jobs but does not clearly warn that video URLs, task parameters, and related metadata are sent to a third-party service. This can lead users to share sensitive media locations or task data without informed consent, especially if URLs embed tokens or point to private assets.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The skill is presented as a flash video super-resolution integration, but the bundled client can enumerate all marketplace apps and retrieve their schemas. In an agent setting, this scope expansion enables capability discovery and use of unrelated remote plugins, increasing the blast radius from a narrow media task client to a generic remote service broker.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

Medium
Category
Not specified by scanner
Confidence
97% confidence
Finding

The call command accepts arbitrary <app> and <api> values and forwards arbitrary JSON bodies, effectively turning the skill into a universal invocation proxy for the entire plugin marketplace. In an agent environment, this can bypass the manifest’s stated scope and enable unreviewed remote actions against any app the API key can access.

Content

No source excerpt is available for this finding.

Intent-Code Divergence

Low
Category
Not specified by scanner
Confidence
98% confidence
Finding

The module docstring says client.py whoami can verify the key and show account and balance, but cmd_whoami only calls /api/v1/apps, emits app count/listing, and explicitly notes that the gateway does not provide account/balance information. This is an active contradiction between the embedded documentation and actual behavior.

Content

No source excerpt is available for this finding.

Intent-Code Divergence

Low
Category
Not specified by scanner
Confidence
99% confidence
Finding

The top-level usage documentation states client.py points will check balance, yet cmd_points explicitly says there is no public balance endpoint and instead sums recent task points_cost values as a reference. That is a direct contradiction, not merely incomplete documentation.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.