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.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- Fluentd TD-agent plugin 4.0.1 - Insecure Folder Permission EDB-49363 · local · Jan 5, 2021
GitHub 1 repository
-
zubrahzz/FluentD-TD-agent-Exploit-CVE-2020-28169 ★ 0 · Dec 24, 2020
Insecure Folder permission that lead to privilege escalation
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- https://docs.fluentd.org/installation/install-by-msi
- https://td-agent-package-browser.herokuapp.com/4/windows
- https://www.fluentd.org/
- https://github.com/kenhys/td-agent-builder/commit/eec6e2dedf12f2e0c01c2bbe7b8c15b639b3b938
- https://github.com/fluent/fluentd/issues/3201
- https://github.com/fluent-plugins-nursery/td-agent-builder/pull/247/commits/6f9cb6393392d62caa99907c0ebbcbab6b94a3f1
- http://packetstormsecurity.com/files/160791/Fluentd-TD-agent-4.0.1-Insecure-Folder-Permission.html
- DSA-4949 vendor-advisory