Vulnerability CVE-2020-28169

Vulnerability Name:

CVE-2020-28169 (CCN-193794)

Assigned:

2020-12-12

Published:

2020-12-12

Updated:

2022-04-05

Summary:

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.

CVSS v3 Severity:

7.0 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.1 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Local Attack Complexity (AC): High Privileges Required (PR): Low User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): High Integrity (I): High Availibility (A): High

7.8 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Local Attack Complexity (AC): Low Privileges Required (PR): Low User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): High Integrity (I): High Availibility (A): High

CVSS v2 Severity:

6.9 Medium (CVSS v2 Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C)

Exploitability Metrics:	Access Vector (AV): Local Access Complexity (AC): Medium Authentication (Au): None
Impact Metrics:	Confidentiality (C): Complete Integrity (I): Complete Availibility (A): Complete

6.8 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:C/I:C/A:C)

Exploitability Metrics:	Access Vector (AV): Local Access Complexity (AC): Low Athentication (Au): Single_Instance
Impact Metrics:	Confidentiality (C): Complete Integrity (I): Complete Availibility (A): Complete

Vulnerability Type:

CWE-732

Vulnerability Consequences:

Gain Privileges

References:

Source: MITRE
Type: CNA
CVE-2020-28169

Source: MISC
Type: Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/160791/Fluentd-TD-agent-4.0.1-Insecure-Folder-Permission.html

Source: MISC
Type: Product, Vendor Advisory
https://docs.fluentd.org/installation/install-by-msi

Source: XF
Type: UNKNOWN
fluentd-cve202028169-priv-esc(193794)

Source: CONFIRM
Type: Patch, Third Party Advisory
https://github.com/fluent-plugins-nursery/td-agent-builder/pull/247/commits/6f9cb6393392d62caa99907c0ebbcbab6b94a3f1

Source: CCN
Type: fluentd GIT Repository
Possible Vulnerability #3201

Source: CONFIRM
Type: Exploit, Issue Tracking, Third Party Advisory
https://github.com/fluent/fluentd/issues/3201

Source: CONFIRM
Type: Patch, Third Party Advisory
https://github.com/kenhys/td-agent-builder/commit/eec6e2dedf12f2e0c01c2bbe7b8c15b639b3b938

Source: CCN
Type: Packet Storm Security [01-05-2021]
Fluentd TD-agent 4.0.1 Insecure Folder Permission

Source: MISC
Type: Third Party Advisory
https://td-agent-package-browser.herokuapp.com/4/windows

Source: DEBIAN
Type: Third Party Advisory
DSA-4949

Source: EXPLOIT-DB
Type: EXPLOIT
Offensive Security Exploit Database [01-05-2021]

Source: MISC
Type: Vendor Advisory
https://www.fluentd.org/

Vulnerable Configuration:

Configuration 1:

cpe:/a:td-agent-builder_project:td-agent-builder:*:*:*:*:*:fluentd:*:* (Version < 2020-12-18)

AND

cpe:/o:microsoft:windows:-:*:*:*:*:*:*:*

Configuration 2:

cpe:/o:debian:debian_linux:10.0:*:*:*:*:*:*:*

Denotes that component is vulnerable

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