Arbitrary File Write via Archive Extraction (Zip Slip)

Affecting microweber/microweber package, versions <1.2.0.x-dev

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Overview

microweber/microweber is a new generation CMS with drag and drop.

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip). A directory traversal issue in the Utils/Unzip module allows an authenticated attacker to gain remote code execution via the backup restore feature. To exploit the vulnerability, an attacker must have the credentials of an administrative user, upload a maliciously constructed ZIP file with file paths including relative paths (i.e., ../../), move this file into the backup directory, and execute a restore on this file.

Details

It is exploited using a specially crafted zip archive, that holds path traversal filenames. When exploited, a filename in a malicious archive is concatenated to the target extraction directory, which results in the final path ending up outside of the target folder. For instance, a zip may hold a file with a "../../file.exe" location and thus break out of the target folder. If an executable or a configuration file is overwritten with a file containing malicious code, the problem can turn into an arbitrary code execution issue quite easily.

The following is an example of a zip archive with one benign file and one malicious file. Extracting the malicous file will result in traversing out of the target folder, ending up in /root/.ssh/ overwriting the authorized_keys file:


+2018-04-15 22:04:29 ..... 19 19 good.txt

+2018-04-15 22:04:42 ..... 20 20 ../../../../../../root/.ssh/authorized_keys

Remediation

Upgrade microweber/microweber to version 1.2.0.x-dev or higher.

References

CVSS Score

7.2
high severity
  • Attack Vector
    Network
  • Attack Complexity
    Low
  • Privileges Required
    High
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    High
  • Integrity
    High
  • Availability
    High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P
Credit
sl1nki
CWE
CWE-29
Snyk ID
SNYK-PHP-MICROWEBERMICROWEBER-1075032
Disclosed
16 Feb, 2021
Published
16 Feb, 2021