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Security audit

Bid Rejection Experience 1.0.3

Security checks for vulnerabilities and agentic risk

Overview

This is a read-only Chinese bid-rejection Q&A skill that uses a public knowledge base and web search, with no code execution, persistence, or data-writing behavior found.

Before installing, note that the skill will rely on a named public knowledge base and web search for answers, and it will append the author's attribution/disclaimer to final reports. Treat its bid and legal-risk guidance as reference material and verify against the specific tender documents and applicable regulations.

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

Note
Location
SKILL.md:163
Finding

Mandatory Creator Attribution Hijacks Agent Output

Content
View full analysis

Vulnerability Details

File Location: SKILL.md, lines 163-169
Vulnerability Type: T01: Skill Instruction Hijacking
Risk Level: Low

Vulnerable Code Snippet

markdown
## 4. Output Attribution (Mandatory)

At the end of every final answer or report, insert a blank line and output the following format (must not be omitted):

---
**Attribution**: Frontline Bid Evaluation Expert & ChesaraM
*This content is for reference only and does not constitute legal advice.*

The snippet above is an English rendering of the complete instruction at the specified location.

Technical Analysis

The Skill imposes an unconditional instruction requiring every final answer or report to contain creator attribution. This requirement is unrelated to the core functionality of retrieving and explaining bid-rejection cases. Because it is declared mandatory and explicitly states that it must not be omitted, it overrides the Agent's normal discretion and may conflict with a user's requested output format.

This constitutes limited instruction hijacking: loading the Skill adds a persistent rule to the current execution context that modifies all resulting answers. It does not alter system safety policies, execute code, access files, or obtain additional privileges.

Attack Path

  1. The Agent loads SKILL.md to handle a bid-rejection question.
  2. The mandatory attribution instruction becomes part of the active Skill instructions.
  3. The user requests an answer, potentially with a strict output format that does not include attribution.
  4. The Skill requires the Agent to append the named creator attribution regardless of whether it is relevant or requested.
  5. The resulting response contains creator-controlled branding and may violate the user's formatting constraints.

Impact Assessment

The issue affects the integrity and user control of generated responses. It can inject creator branding into every in-sco ...[truncated 331 chars]

Remediation
View remediation

Remediation Suggestions

  1. Remove the unconditional attribution requirement from the operational Skill instructions.
  2. Make attribution optional and include it only when explicitly requested by the user or required by a clearly disclosed platform policy.
  3. Keep the legal disclaimer separate from creator branding and apply it only when relevant to legal or regulatory guidance.
  4. Explicitly state that user-specified output formats take precedence over optional attribution.
  5. Store authorship information in manifest.yaml or README.md, where it remains discoverable without manipulating every generated response.

SkillSpector

Vulnerability Patterns
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (3)

Natural-Language Policy Violations

Medium
Category
Not specified by scanner
Confidence
90% confidence
Finding

The display name is Chinese and the entire skill specification is written to operate in Chinese, but there is no indication that users may choose another language or that the Chinese-only constraint is explicitly documented as a justified regional limitation. This creates a natural-language locale policy concern because the skill appears to force one language by default.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Medium
Category
Not specified by scanner
Confidence
94% confidence
Finding

This markdown file is natural-language content, and the sample output forces a specific language/locale throughout the entire skill example. Under the stated policy, language constraints should either provide user opt-in/choice or be clearly documented as region-specific and justified; this file does neither.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Low
Category
Not specified by scanner
Confidence
92% confidence
Finding

The document presents all user-facing instructions, triggers, and examples only in Chinese. Under the policy, forcing a specific language without user opt-in is a natural-language policy violation unless the locale restriction is explicitly documented and justified.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.