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Security audit

spawnxchange-buying

Security checks for vulnerabilities and agentic risk

Overview

This is a transparent marketplace-buying reference that spends USDC only when the user directs a purchase and contains no hidden executable code.

Install only if you intend to use SpawnXchange with a wallet. Confirm item price and accepted chain before signing, avoid putting wallet keys or signed URLs in chat/logs, keep purchase records private, inspect downloaded artifacts before running them, and remember that username changes and feedback/contact messages can affect your public or account-facing profile.

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
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (7)

Skill Enumeration

Medium
Category
Agent Snooping
Content
related_skills: [spawnxchange, spawnxchange-selling, spawnxchange-circle-wallet, spawnxchange-awal, spawnxchange-agentcash, spawnxchange-cdp-cli]
schema_version: 1
source:
  raw_url: https://raw.githubusercontent.com/avlk/spawnxchange-skills/main/skills/spawnxchange-buying/SKILL.md
  repo_url: https://github.com/avlk/spawnxchange-skills
install:
  method: raw
Confidence
80% confidence
Finding
Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.

Skill Enumeration

Medium
Category
Agent Snooping
Content
related_skills: [spawnxchange, spawnxchange-selling, spawnxchange-circle-wallet, spawnxchange-awal, spawnxchange-agentcash, spawnxchange-cdp-cli]
schema_version: 1
source:
  raw_url: https://raw.githubusercontent.com/avlk/spawnxchange-skills/main/skills/spawnxchange-buying/SKILL.md
  repo_url: https://github.com/avlk/spawnxchange-skills
install:
  method: raw
Confidence
80% confidence
Finding
Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.

Skill Enumeration

Medium
Category
Agent Snooping
Content
related_skills: [spawnxchange, spawnxchange-selling, spawnxchange-circle-wallet, spawnxchange-awal, spawnxchange-agentcash, spawnxchange-cdp-cli]
schema_version: 1
source:
  raw_url: https://raw.githubusercontent.com/avlk/spawnxchange-skills/main/skills/spawnxchange-buying/SKILL.md
  repo_url: https://github.com/avlk/spawnxchange-skills
install:
  method: raw
Confidence
80% confidence
Finding
Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.

Description-Behavior Mismatch

Medium
Confidence
92% confidence
Finding
The manifest limits the skill to buying marketplace items, retrieving purchased outputs, re-accessing orders, and leaving item feedback. The platform feedback endpoint is a general support/reporting capability for contacting the service about problems, including accountless use, which is not described in the manifest.

Description-Behavior Mismatch

Medium
Confidence
90% confidence
Finding
The manifest describes searching, purchasing, retrieving artifacts/invoices, re-accessing past orders, and leaving item feedback. The documented behavior also exposes account-facing username retrieval and one-time username changes, which are separate profile-management capabilities not mentioned in that scope.

Sudo/Root Execution

Medium
Category
Privilege Escalation
Content
A buyer should treat purchases as durable inventory.

Local handling rules:
- keep the buyer state directory owner-only, for example `chmod 700 ~/.local/share/spawnxchange/agents`
- keep the ledger owner-read/write only, for example `chmod 600 purchases.jsonl`
- do not commit purchase records, private keys, signed payment headers, signed download URLs, cached artifacts, or artifact checksums
- do not copy purchase records or cached artifacts into shared logs, issue trackers, chat transcripts, or unencrypted backups
Confidence
80% confidence
Finding
Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Sudo/Root Execution

Medium
Category
Privilege Escalation
Content
Local handling rules:
- keep the buyer state directory owner-only, for example `chmod 700 ~/.local/share/spawnxchange/agents`
- keep the ledger owner-read/write only, for example `chmod 600 purchases.jsonl`
- do not commit purchase records, private keys, signed payment headers, signed download URLs, cached artifacts, or artifact checksums
- do not copy purchase records or cached artifacts into shared logs, issue trackers, chat transcripts, or unencrypted backups
- delete cached artifacts when they are no longer needed for reuse, support, or compliance
Confidence
80% confidence
Finding
Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Static analysis

No suspicious patterns detected.