Path Traversal in Grafana Loki
CVE-2021-36156
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.015 (72.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: -0.000
Affected products
Weakness classification (CWE)
References
- github.com/grafana/loki/pull/4020 (Third Party Advisory, Issue Tracking)
- github.com/grafana/loki/releases/tag/v2.3.0 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-36156?
- CVE-2021-36156 is a medium-severity vulnerability in Grafana Loki, classified under Path Traversal. CVSS score: 5.3/10. Published 2021-08-03.
- How severe is CVE-2021-36156?
- Medium severity. CVSS v3 base score is 5.3 out of 10.