T03 · Remote Payload Retrieval and Execution
Error
- Location
- video/SadTalker/docs/webui_extension.md:12
- Finding
- Unverified Remote Shell Script Retrieval and Execution<![CDATA[ ## Vulnerability Details **File Location**: `video/SadTalker/docs/webui_extension.md:12` **Vulnerability Type**: Remote payload retrieval and execution **Risk Level**: Critical ### Vulnerable Code ```bash bash <(wget -qO- https://raw.githubusercontent.com/Winfredy/OpenTalker/main/scripts/download_models.sh) ``` ### Technical Analysis The documentation instructs users to retrieve a shell script from a mutable remote GitHub branch and execute it immediately through Bash. The downloaded content is not pinned to a commit, saved for inspection, checked against an expected cryptographic digest, or authenticated with a release signature. The effective payload can therefore change after the local Skill has been reviewed. Although HTTPS protects the network connection under normal conditions, it does not protect against compromise of the hosting account, repository, branch, or upstream release process. This behavior is not necessary for the declared media-generation functionality. Model artifacts can instead be downloaded as data files from immutable releases and verified before use. ### Attack Path 1. An attacker compromises the `Winfredy/OpenTalker` repository, its maintainer account, or the referenced `main` branch. 2. The attacker modifies `scripts/download_models.sh` to contain arbitrary shell commands. 3. A user follows the installation instruction included in this project. 4. `wget` retrieves the attacker-controlled script into process substitution. 5. Bash executes the content immediately with the current user's privileges. 6. The payload can read or alter any resource available to that user, install persistence, steal credentials, or download additional malware. ### Impact Assessment Successful exploitation provides arbitrary command execution with the privileges of the user following the documentation. If the command is run by an administrator, inside a privileged container, or in a sensitive CI environment, the scope can include system-wi ...[truncated 81 chars]
- Remediation
- <![CDATA[ ## Remediation Suggestions 1. Remove the direct `bash <(wget ...)` execution instruction. 2. Pin the remote resource to an immutable audited commit or versioned release. 3. Download the script to a local file rather than piping it directly to Bash. 4. Publish an expected SHA-256 digest or cryptographic signature and verify it before execution. 5. Let users inspect the downloaded script before explicitly executing it. 6. Prefer a local, reviewed model-download script included in the Skill package. 7. Download model artifacts as data only, with a manifest containing immutable URLs, expected sizes, and cryptographic hashes. ]]>