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Security audit

Perplexity

Security checks for vulnerabilities and agentic risk

Overview

The Perplexity workflow is coherent, but setup directs the agent to execute an unverified remote installer without clear user approval.

Review and approve the CLI installation separately, including its automatic installation of other agent skills. Prefer a fixed, verified release over executing the supplied remote-script commands directly. Requests pass through OOMOL and may incur charges. The installer and live connector implementation were not verified; no malicious payload was established.

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
Vulnerability Patterns
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Output HandlingUnvalidated Output Injection, Cross-Context Output, Unbounded Output
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (4)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
98% confidence
Finding

The supplied command performs remote software installation, not a demonstrated Perplexity operation. Although installation can be a supporting implementation detail, the supplied content establishes no relationship between this installer and the declared Perplexity capabilities. The downloaded script's contents and subsequent effects are not available for assessment.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a mutable remote response directly into Bash gives the downloaded content immediate execution privileges without an opportunity to verify it first. HTTPS protects transport but does not prevent malicious changes at the publisher or distribution infrastructure; this is the same underlying installation risk identified in SQP-2, not a separate exploit.

Content

Scanner excerpt · SKILL.md (reported line 58)May include surrounding context.

First-time setup instructs execution of remotely downloaded installer scripts without a safety warning.

Medium
Category
Output Handling
Confidence
97% confidence
Finding

The setup instructions direct the agent to execute downloaded shell or PowerShell scripts immediately, without integrity verification, review, or explicit installation approval. A compromised distribution endpoint could execute arbitrary code with the invoking user's privileges; limiting setup to a missing-CLI error reduces exposure but does not protect the execution path.

Content

No source excerpt is available for this finding.

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
80% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 79)May include surrounding context.

md
- **`OOMOL_INSUFFICIENT_CREDIT`** — OOMOL billing stop. Recharge at `https://console.oomol.com/billing/token-recharge` before retrying.

- **HTTP 402 without `OOMOL_INSUFFICIENT_CREDIT`** — the third-party account itself has no active plan or credit. Report the provider error message as is; do not ask the user to recharge OOMOL.

## Resources