Security audit

UpNote

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward UpNote automation wrapper, with one limited URL-encoding weakness that users should be aware of.

Install only if you are comfortable letting the agent open UpNote and create or navigate notes on your behalf. Avoid using untrusted note or notebook IDs with special URL characters until the script encodes all URL parameters consistently.

A.I.G

Vulnerability Patterns

Insecure Skill Coding PracticesFinds exploitable flaws such as hardcoded secrets or command injection
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

Findings (1)

T09 · Insecure Skill Coding Practices

Warning

Location: scripts/upnote.sh:59
Finding: Custom URL Query Parameter Injection Through Unencoded User Input
Content: View full analysis
[true|false]" exit 1 fi open "upnote://x-callback-url/openNote?noteId=$NOTE_ID&new_window=$NEW_WINDOW" ;; ``` ```bash open) shift NOTEBOOK_ID="$1" if [[ -z "$NOTEBOOK_ID" ]]; then echo "Usage: upnote notebook open " exit 1 fi open "upnote://x-callback-url/openNotebook?notebookId=$NOTEBOOK_ID" ;; ``` ```bash filter) shift FILTER_ID="$1" if [[ -z "$FILTER_ID" ]]; then echo "Usage: upnote filter " exit 1 fi open "upnote://x-callback-url/openFilter?filterId=$FILTER_ID" ;; ``` ```bash view) shift MODE="$1" URL="upnote://x-callback-url/view?mode=$MODE" shift while [[ $# -gt 0 ]]; do case $1 in --note-id) URL+="¬eId=$2"; shift 2 ;; --notebook-id) URL+="¬ebookId=$2"; shift 2 ;; --tag-id) URL+="&tagId=$2"; shift 2 ;; --filter-id) URL+="&filterId=$2"; shift 2 ;; --space-id) URL+="&spaceId=$2"; shift 2 ;; --query) URL+="&action=search&query=$(urlencode "$2")"; shift 2 ;; *) echo "Unknown option: $1"; exit 1 ;; esac done open "$URL" ;; ``` ### Technical Analysis The script constructs `upnote://x-callback-url` URLs by directly concatenating several user-controlled values into the query string. The affected values include: - Note IDs - Notebook IDs - Filter IDs - Tag IDs - Space IDs - View modes - The `new_window` argument Unlike note titles, note content, notebook names, tag names, and search queries, the ...[truncated 2776 chars]
Remediation: View remediation

SkillSpector

Vulnerability Patterns

Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
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
Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep

Static analysis

No suspicious patterns detected.