Arbitrary File Write via Archive Extraction (Zip Slip) Affecting platformio package, versions [,4.1.0)


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

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  • Snyk IDSNYK-PYTHON-PLATFORMIO-568834
  • published12 May 2020
  • disclosed24 Oct 2019
  • creditUnknown

Introduced: 24 Oct 2019

CVE NOT AVAILABLE CWE-29  (opens in a new tab)

How to fix?

Upgrade platformio to version 4.1.0 or higher.

Overview

platformio is a new generation ecosystem for embedded development. Cross-platform IDE and Unified Debugger. Static Code Analyzer and Remote Unit Testing. Multi-platform and Multi-architecture Build System. Firmware File Explorer and Memory Inspection. Arduino, ARM mbed, Espressif (ESP8266/ESP32), STM32, PIC32, nRF51/nRF52, RISC-V, FPGA, CMSIS, SPL, AVR, Samsung ARTIK, libOpenCM3.

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip). It is possible to overwrite files when using FileUnpacker to extract items from TAR archive.

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

CVSS Scores

version 3.1