An issue was discovered in Grafana Cortex through 1.9.0. 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 Cortex will attempt to parse a rules file at that location and include some of the contents in the error message. (Other Cortex API requests can also be sent a malicious OrgID header, e.g., tricking the ingester into writing metrics to a different location, but the effect is nuisance rather than information disclosure.)

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-36157
• cortexproject/cortex#4375
• cortexproject/cortex@d9e1f81
• https://grafana.com/docs/grafana/latest/release-notes/