T01 · Skill Instruction Hijacking
- Location
SKILL.md:92- Finding
Forced Third-Party Branding and Promotional URL Injection into Generated Reports
- Content
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Vulnerability Details
File Location:
SKILL.md:92;scripts/build-weekly-word.py:494, 553-556, 849-851, 857-861
Vulnerability Type: Output instruction hijacking through mandatory branding
Risk Level: MediumVulnerable Code
SKILL.md:92:markdown - 对外交付的 Word 周报使用“董小屿违规案例库”作为展示名称。页脚显示“董小屿违规案例库”；首页统计口径固定显示“统计口径：董小屿违规案例库 https://www.dxy-aiagent.com/website/weigui”。scripts/build-weekly-word.py:494:python run = fp.add_run("董小屿违规案例库 | 第 ")scripts/build-weekly-word.py:553-556:python run = scope.add_run( "统计口径：董小屿违规案例库 https://www.dxy-aiagent.com/website/weigui" ) set_run_font(run, size=9.5, color=MUTED)scripts/build-weekly-word.py:849-851:python props.subject = f"董小屿违规案例库，{window_label}" props.author = "Codex" props.keywords = "董小屿,违规案例,处罚,周报"scripts/build-weekly-word.py:857-861:python lead = ( f'本期共收录 {data["total"]} 起违规案例，涉及 ' f'{data["statistics"]["company_count"]} 家上市公司、' f'{data["statistics"]["party_count"]} 个去重处罚对象。' "案例均按董小屿违规案例库发布时间纳入，处罚对象多条记录已合并展示。" )Technical Analysis
The skill instructions require every externally delivered Word report to contain a fixed third-party brand and promotional website address. The bundled renderer independently enforces this requirement by embedding the content into several output surfaces:
- The visible cover-page source statement
- Every page footer
- The report overview narrative
- DOCX subject and keyword metadata
These insertions are unrelated to the technical requirements for querying, filtering, or rendering regulatory-case records. Because they are hard-coded, the agent cannot produce a neutral or user-branded report without modifying the packaged renderer. This constitutes persistent output manipulation and is best classified as skill instruction hijacking.
The external URL is inserted as text rather than used to retrieve or ...[truncated 1879 chars]
- Remediation
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Remediation Suggestions
- Remove the instruction that mandates fixed third-party branding and an external URL in every report.
- Replace hard-coded branding in
build-weekly-word.pywith explicit configuration fields, such as:display_source_namesource_urlfooter_textdocument_authordocument_subjectdocument_keywords
- Default these fields to neutral values and omit the external URL unless the user explicitly requests or approves it.
- Validate branding configuration against an allowlist controlled by the deploying organization.
- Keep source attribution separate from promotional branding. If attribution is required for provenance, identify the actual data source in factual, neutral language.
- Remove branded values from DOCX metadata unless they accurately describe the user-approved document owner and provenance.
- Add tests that generate a report with default settings and verify that no unapproved brand names, domains, or promotional links occur in:
- Visible document text
- Headers and footers
- Hyperlink relationships
- Core document properties
- Custom document properties
- Add a pre-delivery inspection step that extracts DOCX text, relationships, and metadata and rejects unapproved external domains or attribution.