Bug 2183161 (CVE-2021-36156)

Summary:	CVE-2021-36156 loki: Path traversal in Grafana Loki
Product:	[Other] Security Response	Reporter:	Avinash Hanwate <ahanwate>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dfreiber, gparvin, grafana-maint, jburrell, jcantril, jkurik, jwendell, nathans, njean, owatkins, pahickey, periklis, rcernich, rogbas, scox, stcannon, teagle, twalsh, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Grafana loki 2.3.0	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in Grafana Loki that could allow a remote attacker to traverse directories on the system, caused by improper input validation by the X-Scope-OrgID header value. An attacker could send a specially-crafted URL request containing "dot dot" sequences (/../) to view some of the contents in the error message.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2183163, 2183165, 2183176
Bug Blocks:	2180566

Description Avinash Hanwate 2023-03-30 13:22:27 UTC

An issue was discovered in Grafana Loki through 2.2.1. The header value X-Scope-OrgID is used to construct file paths for rules files, and if crafted to conduct directory traversal such as ae ../../sensitive/path/in/deployment pathname, then Loki will attempt to parse a rules file at that location and include some of the contents in the error message.

https://github.com/grafana/loki/pull/4020#issue-694377133
https://github.com/grafana/loki/releases/tag/v2.3.0

Comment 1 Avinash Hanwate 2023-03-30 13:27:21 UTC

Created grafana tracking bugs for this issue:

Affects: fedora-all [bug 2183163]