GHSA-23f7-99jx-m54r

### Impact Remote code execution vulnerability in `dependabot-common` and `dependabot-go_modules` when a source branch name contains malicious injectable bash code.

For example, if Dependabot is configured to use the following source branch name: `"/$({curl,127.0.0.1})"`, Dependabot will make a HTTP request to the following URL: 127.0.0.1 when cloning the source repository.

When Dependabot is configured to clone the source repository during an update, Dependabot runs a shell command to git clone the repository:

```bash git clone --no-tags --no-recurse-submodules --depth=1 --branch=<BRANCH> --single-branch <GITHUB_REPO_URL> repo/contents/path ```

Dependabot will always clone the source repository for `go_modules` during the file fetching step and can be configured to clone the repository for other package managers using the `FileFetcher` class from `dependabot-common`.

```ruby source = Dependabot::Source.new( provider: "github", repo: "repo/name", directory: "/", branch: "/$({curl,127.0.0.1})", )

repo_contents_path = "./file/path" fetcher = Dependabot::FileFetchers.for_package_manager("bundler"). new(source: source, credentials: [], repo_contents_path: repo_contents_path) fetcher.clone_repo_contents ```

### Patches

The fix was applied to version `0.125.1`: https://github.com/dependabot/dependabot-core/pull/2727

### Workarounds Escape the branch name prior to passing it to the `Dependabot::Source` class.

For example using `shellwords`:

```ruby require "shellwords" branch = Shellwords.escape("/$({curl,127.0.0.1})") source = Dependabot::Source.new( provider: "github", repo: "repo/name", directory: "/", branch: branch, ) ```