T03 · Remote Payload Retrieval and Execution
- Location
scripts/install.sh:153- Finding
Unverified Remote Homebrew Installer Recommended for Direct Shell Execution
- Content
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Vulnerability Details
File Location:
scripts/install.sh, lines 153-164
Vulnerability Type: Remote payload retrieval and execution
Risk Level: MediumVulnerable code:
bash else error "SwiftBar not installed and Homebrew not found." echo "" echo " Option 1: Install Homebrew first:" echo " /bin/bash -c \"\$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)\"" echo " brew install --cask swiftbar" echo "" echo " Option 2: Download SwiftBar directly:" echo " https://github.com/swiftbar/SwiftBar/releases" echo "" echo " Then run this installer again." exit 1 fiTechnical Analysis
When Homebrew is unavailable, the installer prints a command that downloads the current
HEADrevision of Homebrew's installation script and passes it directly to Bash. The project does not automatically execute this command, and the URL belongs to the official Homebrew GitHub repository rather than a personal pastebin. Nevertheless, the recommended workflow creates a remote code-execution channel whose effective payload can change after this Skill has been reviewed.No release, commit, checksum, or cryptographic signature is pinned or verified. If the upstream repository, GitHub account, delivery infrastructure, or DNS/TLS trust path is compromised, a user following the displayed instruction would execute the substituted payload immediately.
Installing Homebrew may be useful for obtaining SwiftBar, but direct execution of a mutable remote script is not the minimum-risk method required for the declared menu-bar monitoring functionality. The script already presents direct SwiftBar installation as an alternative.
Attack Path
- SwiftBar and Homebrew are absent from the user's Mac.
- The user runs
scripts/install.sh. - The installer displays the
curl | bash-equivalent command as the primary option. - An attacker compromises or in ...[truncated 866 chars]
- Remediation
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Remediation Suggestions
- Prefer directing users to Homebrew's official installation documentation rather than printing a ready-to-run remote shell pipeline.
- Recommend downloading the installer to a local file, inspecting it, and executing it separately.
- If automated retrieval is retained, pin the URL to a reviewed immutable commit rather than
HEAD. - Verify the downloaded file against a trusted, published cryptographic digest or signature before execution.
- Present direct installation of a signed SwiftBar release as the preferred minimal-dependency path.
- Clearly state that Homebrew installation is optional and requires separate informed user approval.
