CVE-2020-28169

Severity: high (CVSS 7.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-12-24 · updated 2026-06-17
Weakness: CWE-732

Description

The td-agent-builder plugin before 2020-12-18 for Fluentd allows attackers to gain privileges because the bin directory is writable by a user account, but a file in bin is executed as NT AUTHORITY\SYSTEM.

Affected products

Debian Linux: 10.0
Td-Agent-Builder Project Td-Agent-Builder: before 2020-12-18 — fixed in 2020-12-18

How to fix

Upgrade to a fixed version: Td-Agent-Builder Project Td-Agent-Builder 2020-12-18. Check the vendor advisory for mitigations.

References

http://packetstormsecurity.com/files/160791/Fluentd-TD-agent-4.0.1-Insecure-Folder-Permission.html
https://docs.fluentd.org/installation/install-by-msi
https://github.com/fluent-plugins-nursery/td-agent-builder/pull/247/commits/6f9cb6393392d62caa99907c0ebbcbab6b94a3f1
https://github.com/fluent/fluentd/issues/3201
https://github.com/kenhys/td-agent-builder/commit/eec6e2dedf12f2e0c01c2bbe7b8c15b639b3b938
https://td-agent-package-browser.herokuapp.com/4/windows
https://www.debian.org/security/2021/dsa-4949
https://www.fluentd.org/
http://packetstormsecurity.com/files/160791/Fluentd-TD-agent-4.0.1-Insecure-Folder-Permission.html
https://docs.fluentd.org/installation/install-by-msi
https://github.com/fluent-plugins-nursery/td-agent-builder/pull/247/commits/6f9cb6393392d62caa99907c0ebbcbab6b94a3f1
https://github.com/fluent/fluentd/issues/3201

Get alerted when CVE-2020-28169 or the next vulnerability affects your stack