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Security audit

Mobile Plan Switch手机省钱流量套餐

Security checks for vulnerabilities and agentic risk

Overview

The skill mostly matches phone-plan switching advice, but it steers users to a hard-coded commercial SIM-card storefront without clear affiliate disclosure and includes an under-disclosed local affiliate-config reader.

Review before installing. This skill may give useful Chinese mobile-plan downgrade guidance, but it also pushes a specific SIM-card application storefront and does not clearly explain whether the link is affiliate/tracked or how the storefront handles identity, phone, and address data. Prefer official carrier channels or require explicit disclosure and consent before using the application link or QR-code flow.

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
Findings (1)

T01 · Skill Instruction Hijacking

Error
Location
SKILL.md:48
Finding

Mandatory Affiliate Link Injection into Agent Responses

Content
View full analysis
Remediation
View remediation

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
Findings (9)

Tp4

High
Category
MCP Tool Poisoning
Confidence
98% confidence
Finding

The declared purpose is helping users switch phone plans, but the behavior reportedly includes reading a local affiliate config, generating affiliate storefront links, and using hard-coded commercial identifiers unrelated to the stated assistance workflow. That mismatch is dangerous because it can covertly monetize users, expose local configuration data, and route users through tracking infrastructure without informed consent.

Content

No source excerpt is available for this finding.

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
84% confidence
Finding

The skill appears to rely on file-reading capability without explicitly declaring the required tool scope or permissions. Hidden or undeclared capability use weakens sandboxing and reviewability, making it harder to detect when the skill accesses local data such as affiliate configuration files.

Content

No source excerpt is available for this finding.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The description lists activation phrases such as "换套餐", "流量不够用", and "手机省钱", which are broad consumer phrases that could arise in ordinary conversation outside the intended narrow workflow. The file does not provide exclusion conditions or negative examples to clarify when the skill should not activate.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
88% confidence
Finding

The skill encourages users to change carrier plans and apply for SIM cards while omitting prominent warnings about privacy, identity verification, contract lock-ins, billing changes, loss of bundled benefits, and affiliate incentives. In this context, users may be nudged into financial or account-impacting actions without understanding the risks or the commercial motivation behind the recommendation.

Content

No source excerpt is available for this finding.

Context-Inappropriate Capability

Medium
Category
Not specified by scanner
Confidence
93% confidence
Finding

The code reads a local affiliate-related configuration file and uses that context to generate tracking-style commerce links, which is not clearly justified by the core purpose of helping users downgrade phone plans. Accessing local configuration tied to referral identity increases the risk of undisclosed monetization, user steering, and misuse of local environment data for commercial attribution.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

Medium
Category
Not specified by scanner
Confidence
96% confidence
Finding

The script goes beyond merely helping users switch to low-cost carrier plans and actively promotes an external card-purchase storefront, including convenience output for sharing the link and QR code. This creates a monetized affiliate redirection path that is not necessary for the declared package-switch guidance and can steer users to third-party commerce destinations under the guise of assistance.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
89% confidence
Finding

The script sends the generated destination URL to a third-party QR code service by embedding it in a GET request. Even if the transmitted data is 'only' a link, this leaks the full affiliate/tracking URL to an external service and creates unnecessary third-party exposure for user-facing commerce flows.

Content

Scanner excerpt · scripts/get_card_link.py (reported line 25)May include surrounding context.

python
if not url:
        return ""
    encoded = url.replace("#", "%23").replace("&", "%26").replace("?", "%3F").replace("=", "%3D").replace("/", "%2F").replace(":", "%3A")
    return f"https://api.qrserver.com/v1/create-qr-code/?size=300x300&data={encoded}"

if __name__ == "__main__":
    cmd = sys.argv[1] if len(sys.argv) > 1 else "url"

Natural-Language Policy Violations

Low
Category
Not specified by scanner
Confidence
90% confidence
Finding

SQP-3 applies to all file types and covers language or locale policy violations. This file presents all instructions in a single language without opt-in or an explicit justification for the language constraint, which may conflict with an organizational policy requiring language choice.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Low
Category
Not specified by scanner
Confidence
93% confidence
Finding

This markdown file contains user-facing natural language exclusively in Chinese, and there is no note offering alternative languages or asking for user preference. Under the policy rule for language or locale constraints, forcing a specific language without user opt-in can be a violation when not documented as region-specific language output.

Content

No source excerpt is available for this finding.