T03 · Remote Payload Retrieval and Execution
Error
- Location
README.md:15- Finding
Unpinned Remote Repository Content Executed with PowerShell Policy Bypass
- Content
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" -MakeMp3` ``` ### Technical Analysis The installation instructions clone a mutable Git repository without pinning a reviewed commit, signed tag, release artifact, or cryptographic checksum. The usage instructions then execute `scripts/master_media.ps1` using PowerShell's `-ExecutionPolicy Bypass` option. The referenced script is absent from the audited artifact, which contains only `README.md` and `SKILL.md`. Its actual behavior—including command construction, filesystem access, network operations, FFmpeg invocation, and input validation—therefore cannot be verified. The effective executable payload is determined by the remote repository contents retrieved at installation time and may differ from the content that was originally reviewed. `-ExecutionPolicy Bypass` does not itself elevate operating-system privileges. However, it suppresses PowerShell execution-policy restrictions for that process, reducing a defense-in-depth barrier that might otherwise prevent or warn about script execution. This behavior best matches **T03: Remote Payload Retrieval and Execution**, because externally hosted, mutable content is retrieved and subsequently executed. ### Attack Path 1. A ...[truncated 1543 chars]- Remediation
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``` 3. Prefer signed release artifacts and verify both the publisher signature and a documented SHA-256 checksum before execution. 4. Remove `-ExecutionPolicy Bypass` unless it is strictly necessary. If it is unavoidable, document the reason and constrain its use to the reviewed script and process. 5. Sign the PowerShell script and use an execution policy that validates trusted publisher signatures where supported. 6. Review the script for command injection, unsafe path handling, unintended network access, insecure temporary files, destructive output behavior, and improper quoting before distribution. 7. Execute media processing with least privilege, without administrator rights, and within a restricted working directory or sandbox where practical. 8. Add automated integrity checks that fail closed when the script hash or checked-out commit differs from the reviewed version. ]]>