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Security audit

Gupshup

Security checks for vulnerabilities and agentic risk

Overview

Review is needed because setup directs the agent to execute downloaded installer code without clear user approval.

Review and approve CLI installation separately, including its automatic skill synchronization. The installer contents remain unverified. OOMOL will mediate your connected Gupshup account, and each message should require approval of its recipient and content. The artifacts do not establish malicious intent.

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 script execution for an Oomol installer, not a visible Gupshup operation. Nothing in the provided chunk establishes this installation as a supporting dependency for the declared purpose. The downloaded script's contents are unavailable, so its further behavior cannot be determined.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
97% confidence
Finding

The command pipes a mutable network response directly into Bash without an independently verified signature, pinned artifact, or review step; the PowerShell fallback uses the equivalent execution pattern. If the installer endpoint or distribution infrastructure is compromised, attacker-controlled code could run with the invoking user's permissions, although the missing-CLI condition limits when this path is reached.

Content

Scanner excerpt · SKILL.md (reported line 57)May include surrounding context.

The setup fallback executes downloaded installer scripts without warning about local code execution or system changes.

Medium
Category
Output Handling
Confidence
93% confidence
Finding

The missing-CLI fallback directs installation through remotely downloaded scripts without requiring approval for local code execution or explaining potential system changes. Restricting installation to a genuine missing-command error reduces exposure, but a Gupshup request is not explicit authorization to install software; the declared tool restriction may limit execution in enforcing environments.

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 78)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