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Security audit

bitclawden

Security checks for vulnerabilities and agentic risk

Overview

This Bitwarden skill is purpose-aligned, but its built-in installer downloads and installs a vault-accessing CLI binary without integrity verification, so users should review it before installing.

Install this only if you are comfortable granting an agent access to your Bitwarden vault through BW_SESSION. Prefer installing the Bitwarden CLI through Bitwarden's documented package-manager path or another verified method instead of the built-in script, and only ask the skill to reveal passwords or TOTP codes when you explicitly need them.

A.I.G

Vulnerability Patterns
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • 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
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs
Findings (1)

T03 · Remote Payload Retrieval and Execution

Error
Location
SKILL.md:18
Finding

Unverified Remote Bitwarden CLI Download and Execution

Content
View full analysis
Remediation
View remediation

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Tool MisuseTool Parameter Abuse, Chaining Abuse, Unsafe Defaults
  • Rogue AgentSelf-Modification, Session Persistence
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (4)

Tool Parameter Abuse

High
Category
Tool Misuse
Confidence
85% confidence
Finding

Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).

Content

Scanner excerpt · SKILL.md (reported line 17)May include surrounding context.

md
{
              "id": "bw-binary",
              "kind": "script",
              "script": "PLATFORM=$(uname -s | tr '[:upper:]' '[:lower:]'); [ \"$PLATFORM\" = 'darwin' ] && PLATFORM='macos'; curl -sL \"https://vault.bitwarden.com/download/?app=cli&platform=${PLATFORM}\" -o /tmp/bw.zip && unzip -o /tmp/bw.zip -d ~/.local/bin/ && chmod +x ~/.local/bin/bw && rm /tmp/bw.zip",
              "bins": ["bw"],
              "requires": ["curl", "unzip"],
              "label": "Install Bitwarden CLI to ~/.local/bin",

Session Persistence

Medium
Category
Rogue Agent
Confidence
60% confidence
Finding

Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Content

Scanner excerpt · README.md (reported line 8)May include surrounding context.

md
## What it does

- Look up usernames, passwords, and TOTP codes
- Create new vault items (logins, secure notes, cards, identities)
- Edit existing items
- Generate strong passwords and passphrases
- Sync vault changes

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
96% confidence
Finding

The invocation guidance says to use the skill when asked to "store, retrieve, find, or manage passwords, secrets, or credentials," which is a broad natural-language trigger without clear scope boundaries or exclusion conditions. Terms like "find" and "manage" are generic enough to match many ordinary requests, increasing the risk of unintended activation.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
90% confidence
Finding

The install script downloads and executes a security-sensitive binary path from the network using curl, then places the resulting executable in ~/.local/bin without any integrity or authenticity verification. In a credential-management skill, this is especially risky because a tampered CLI could steal vault data, session tokens, or user secrets once invoked.

Content

Scanner excerpt · SKILL.md (reported line 17)May include surrounding context.

md
{
              "id": "bw-binary",
              "kind": "script",
              "script": "PLATFORM=$(uname -s | tr '[:upper:]' '[:lower:]'); [ \"$PLATFORM\" = 'darwin' ] && PLATFORM='macos'; curl -sL \"https://vault.bitwarden.com/download/?app=cli&platform=${PLATFORM}\" -o /tmp/bw.zip && unzip -o /tmp/bw.zip -d ~/.local/bin/ && chmod +x ~/.local/bin/bw && rm /tmp/bw.zip",
              "bins": ["bw"],
              "requires": ["curl", "unzip"],
              "label": "Install Bitwarden CLI to ~/.local/bin",