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Security audit

Bingo

Security checks for vulnerabilities and agentic risk

Overview

This is a simple local bingo helper with some broken or overstated features, but no evidence of hidden, destructive, credential-stealing, or network behavior.

Install only if you want a lightweight local bingo helper and can tolerate incomplete gameplay behavior. Do not rely on it for real bingo verification or accurate call history unless those functions are fixed; new-game will clear the skill's stored calls file.

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

SkillSpector

Vulnerability Patterns
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • 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
Findings (5)

Tp4

High
Category
MCP Tool Poisoning
Confidence
95% confidence
Finding

The description claims the skill can generate and play bingo cards with number calling and verification for running bingo games. The code does generate a bingo-style card and can output a random called number, so part of the description is accurate. However, the implementation does not actually record called numbers to the declared data file, making history and stats effectively nonfunctional for real gameplay. The check command also does not verify bingo cards or numbers; it only echoes a placeholder string. Because core declared gameplay capabilities—especially verification and usable call tracking—are missing or incomplete, the description overstates what the code actually does.

Content

No source excerpt is available for this finding.

Whitespace Padding

Medium
Category
Prompt Injection
Confidence
80% confidence
Finding

Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.

Content

Scanner excerpt · scripts/script.sh (reported line 9)May include surrounding context.

sh
DATA_DIR="$HOME/.local/share/bingo"
mkdir -p "$DATA_DIR"

#
#
#
#

Description-Behavior Mismatch

Medium
Category
Not specified by scanner
Confidence
89% confidence
Finding

The manifest describes a skill for running bingo games with number calling and verification, and the presence of new-game, history, and stats suggests called numbers should be persisted. But cmd_call only prints a random number and never appends it to calls.txt, leaving history, stats, and any verification workflow disconnected from actual calls.

Content

No source excerpt is available for this finding.

Intent-Code Divergence

Medium
Category
Not specified by scanner
Confidence
97% confidence
Finding

The manifest says this skill supports bingo verification, and the function name and usage string imply that check validates a bingo card or number list. However, the implementation merely prints the fixed string Checking: $2 in single quotes, so it neither uses the parsed numbers variable nor performs any verification.

Content

No source excerpt is available for this finding.

Missing User Warnings

Low
Category
Not specified by scanner
Confidence
87% confidence
Finding

The new-game command performs a file write that clears prior call history by truncating $DATA_DIR/calls.txt. Although it prints a success message afterward, there is no prior warning, confirmation, or explanatory comment/docstring disclosing that existing data will be overwritten.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.