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Security audit

Bannerbear

Security checks for vulnerabilities and agentic risk

Overview

This Bannerbear skill is mostly coherent, but its first-time setup tells agents to run unverified remote installer scripts, which deserves user review before installation.

Review the install step carefully before using this skill. Prefer installing the oo CLI through a verified package manager or a download-then-inspect process, avoid running the installer as administrator/root, and only allow Bannerbear write actions after checking the exact payload.

A.I.G

Vulnerability Patterns
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • 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
  • 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)

T03 · Remote Payload Retrieval and Execution

Error
Location
SKILL.md:59
Finding

Unverified Remote Installer Download and Execution

Content
View full analysis
Remediation
View remediation

SkillSpector

Vulnerability Patterns
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (2)

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The skill instructs the agent to install software by piping a remotely fetched script directly into a shell (curl ... | bash). This creates a supply-chain and remote code execution risk: if the remote host, transport, or script content is compromised, arbitrary code will execute immediately on the local system.

Content

Scanner excerpt · SKILL.md (reported line 59)May include surrounding context.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
97% confidence
Finding

Line L03 says to use this skill for "ANY Bannerbear request" and "Whenever a task involves Bannerbear," which is a very broad activation rule that could overlap with many incidental mentions of Bannerbear. The description does not provide constraints, exclusions, or negative examples to clarify when the skill should not activate.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.