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GHSA-wm7q-rxch-43mx
No affected components available
Versions of serve before 6.5.2 are vulnerable to the bypass of the ignore functionality. The bypass is possible because validation happens before canonicalization of paths and filenames.
Example: Here we have a server that ignores the file test.txt.
const serve = require('serve')
const server = serve(__dirname, {
port: 1337,
ignore: ['test.txt']
})
Using the URL encoded form of a letter (%65 instead of e) attacker can bypass the ignore control accessing the file.
curl http://localhost:1337/t%65st.txt
Additionally this technique can be used to get directory listings of ignored directories.
Recommendation
Update to version 6.5.2 or later.
Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.
No exploitation activity has been observed at this time. Continue routine monitoring.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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