PT-2021-17327 · Pystemon · Pystemon

Published 2021-02-14 · Updated 2021-02-18 · CVE-2021-27213

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions: pystemon versions prior to 2021-02-13

Description: The issue allows code execution via YAML deserialization because SafeLoader and safe load are not used. This is related to the config.py file in pystemon.

Recommendations: For versions prior to 2021-02-13, update to a version that uses SafeLoader and safe load for YAML deserialization to prevent code execution. As a temporary workaround, consider disabling YAML deserialization in config.py until a patch is available.

Exploit

Fix

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2021-27213

Affected Products

Pystemon

References · 5

• 🔥 https://huntr.dev/bounties/1-other-pystemon · Exploit
• https://github.com/cvandeplas/pystemon/commit/dbeb87afefdb63de2f4cff69b6f10c5965d14b54 · Patch
• https://osv.dev/vulnerability/CVE-2021-27213 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-27213 · Security Note
• https://t.me/cibsecurity/23578 · Telegram Post