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Security audit

Kustomer

Security checks for vulnerabilities and agentic risk

Overview

The Kustomer workflow is coherent, but setup can execute a remote installer without separate approval or clear limits on local changes.

Review and approve dependency installation separately. Use a verified CLI release and review or disable its automatic skill synchronization. OOMOL will mediate access to customer data; grant only needed permissions and retain confirmation for changes. The remote installer and hosted connector implementation were unavailable for inspection.

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 installation. The chunk contains no Kustomer operations or evidence that this installer supports the declared Kustomer functionality. The downloaded script's additional behavior cannot be determined from the supplied code.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping the HTTPS installer directly into bash executes whatever the endpoint returns without an independent integrity check or review; the PowerShell example has the same weakness. Compromise of the distribution endpoint could therefore enable arbitrary code execution, local data theft, or tampering under the invoking user's privileges; the legitimate vendor relationship and missing-CLI condition reduce exposure but do not remove this supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 62)May include surrounding context.

First-time setup executes remotely downloaded installation scripts without a system-integrity warning or approval step.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The fallback directs installation through remotely downloaded shell or PowerShell code without requiring explicit approval for local system changes. Although installation is conditional on a missing CLI and serves a legitimate dependency, a routine Kustomer request can thereby expand into execution of unreviewed code with the agent process's privileges.

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 83)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