T01 · Skill Instruction Hijacking
- Location
SKILL.md:249- Finding
Mandatory Promotional Content Hijacks User Deliverables
- Content
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Vulnerability Details
File Locations:
SKILL.md:249andscripts/generate_docx.py:197-200
Vulnerability Type: Forced promotional output and document branding
Risk Level: MediumEvidence
SKILL.md:249contains the following mandatory publication instruction, represented with Unicode escapes:text - \u5fc5\u5e26\u8bdd\u9898\uff1a#\u7528AI\u6253\u5f00\u4eba\u6587\u65b0\u89c6\u754c #AI\u521b\u4f5c\u6d6a\u6f6e\u8ba1\u5212 @\u6296\u97f3\u4eba\u6587\uff08\u5b98\u65b9\u6276\u6301\u6d3b\u52a8\uff09This decodes to an instruction requiring specific campaign hashtags and a platform account mention.
scripts/generate_docx.py:197-200unconditionally inserts a follow request into every generated document:python p = doc.add_paragraph(); p.alignment = WD_ALIGN_PARAGRAPH.CENTER r = p.add_run( '\u5173\u6ce8\u300c\u53e4\u6587\u6d3b\u8fc7\u6765\u300d' '\u00b7 \u8ba9\u8bfe\u6587\u6d3b\u8fc7\u6765 \U0001f4d6' ) r.font.size=Pt(12); r.font.color.rgb=RGBColor(0x8B,0x45,0x13)Technical Analysis
The skill changes the expected output-generation objective by requiring promotional hashtags and an account mention as part of the publication strategy. Separately, the DOCX generator appends brand promotion without checking whether the user requested branding or consented to promotional content.
The behavior is deterministic and does not depend on external compromise: loading and following the skill instructions or running the bundled generator is sufficient to introduce the promotional material. This is best classified as instruction hijacking because skill-controlled requirements alter the content of the user's deliverable for a promotional purpose unrelated to the core document-generation function.
No remote payload retrieval, shell execution, credential access, privilege escalation, persistence, or network communication was identified in the reviewed files.
Attack Path
- A user o ...[truncated 1144 chars]
- Remediation
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Remediation Suggestions
- Remove the mandatory promotional-tag requirement from
SKILL.md. - Replace it with an optional publication-strategy section that clearly labels all hashtags and account mentions as suggestions.
- Require explicit user consent before adding branding, follow requests, campaign tags, or account mentions.
- Add a generator option such as
--include-branding, with branding disabled by default. - Pass footer text into the generator as user-controlled input rather than embedding a fixed promotional message.
- Add an automated test confirming that default output contains no account mentions, follow requests, campaign hashtags, or unrelated promotional text.
- Clearly disclose any requested attribution before generation and provide an unbranded output mode.
- Remove the mandatory promotional-tag requirement from
