CVE-2021-36156: Path Traversal
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.
Affected Software
Remediation
Patch Available
Event History
Frequently Asked Questions
What is the vulnerability ID of this issue in Grafana Loki?
The vulnerability ID of this issue in Grafana Loki is CVE-2021-36156.
What is the severity of CVE-2021-36156?
The severity of CVE-2021-36156 is medium with a CVSS score of 5.3.
What is the affected software version of CVE-2021-36156?
The affected software version of CVE-2021-36156 is Grafana Loki up to and including version 2.2.1.
How can an attacker exploit CVE-2021-36156?
An attacker can exploit CVE-2021-36156 by crafting a malicious X-Scope-OrgID header value to conduct directory traversal and attempt to parse rules files from sensitive locations.
How can I mitigate CVE-2021-36156?
To mitigate CVE-2021-36156, update to Grafana Loki version 2.3.0 or later.