PT-2021-21144 · Grafana+1 · Grafana Loki+1

Simonswine · Published 2021-08-03 · Updated 2026-04-16 · CVE-2021-36156

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions: Grafana Loki versions through 2.2.1

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

Recommendations: For versions through 2.2.1, as a temporary workaround, consider restricting the use of the X-Scope-OrgID header to prevent directory traversal attacks until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

ALT-PU-2021-2558

ALT-PU-2022-2584

CVE-2021-36156

GHSA-GRJ5-8X6Q-HC9Q

Affected Products

Alt Linux

Grafana Loki

References · 9

• https://github.com/grafana/loki/releases/tag/v2.3.0 · Patch
• https://osv.dev/vulnerability/GHSA-grj5-8x6q-hc9q · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-36156 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-36156 · Security Note
• https://github.com/grafana/loki · Note
• https://github.com/grafana/loki/pull/4020#issue-694377133 · Note
• https://github.com/grafana/loki/pull/4020 · Note
• https://twitter.com/CVEnew/status/2044701623096836511 · Twitter Post
• https://t.me/cibsecurity/26740 · Telegram Post