GHSA-g485-8j3v-p6x8

### Summary Anonymous GitHub fetches repository content (e.g., markdown files) from GitHub's API and renders it without sanitization. On the client side, markdown is parsed with `marked` (with `sanitize: false`) and injected into the DOM via `$sce.trustAsHtml()` + `ng-bind-html`, bypassing AngularJS's built-in XSS protection. An attacker can craft a malicious GitHub repository whose README executes arbitrary JavaScript in the Anonymous GitHub origin. ### Details #### README fetched from GitHub API The server fetches the README via GitHub's REST API and stores the raw markdown in MongoDB: ```typescript // https://github.com/tdurieux/anonymous_github/blob/b2d77faa6c6f35ad9ae6ed46e3a3fa4681ac84c2/src/core/source/GitHubRepository.ts#L162-L174 const ghRes = await oct.repos.getReadme({ owner: this.owner, repo: this.repo, ref: selected?.commit, }); const readme = Buffer.from( ghRes.data.content, ghRes.data.encoding as BufferEncoding ).toString("utf-8"); selected.readme = readme; await model.save(); ``` It is then served to the client with no sanitization: ```typescript // https://github.com/tdurieux/anonymous_github/blob/b2d77faa6c6f35ad9ae6ed46e3a3fa4681ac84c2/src/server/routes/repository-private.ts#L254-L260 return res.send( await repo.readme({ accessToken: token, force: req.query.force == "1", branch: req.query.branch as string, }) ); ``` #### Client-side rendering via `$sce.trustAsHtml()` + `ng-bind-html` The client fetches the raw README, parses it with `renderMD()` (which uses `marked` with `sanitize: false`), then bypasses AngularJS sanitization: ```javascript // https://github.com/tdurieux/anonymous_github/blob/b2d77faa6c6f35ad9ae6ed46e3a3fa4681ac84c2/public/script/app.js#L1219-L1226 const res = await $http.get(`/api/repo/${o.owner}/${o.repo}/readme`, { params: { force: force === true ? "1" : "0", branch: $scope.source.branch }, }); $scope.readme = res.data; ``` ```javascript // https://github.com/tdurieux/anonymous_github/blo