CVE-2021-36157 Path traversal in Grafana Cortex
Attackers can read sensitive files via directory traversal in the X-Scope-OrgID header, exposing deployment contents in error messages.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-36157?
CVE-2021-36157 is a medium-severity path traversal vulnerability in n/a, published on 3 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.)
Weakness: CWE-22
Which versions are affected by CVE-2021-36157?
2 open source packages ship an affected version, including github.com/cortexproject/cortex. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/cortexproject/cortex Go | All versions to 1.9.0 | None |
github.com/cortexproject/cortex Go | All versions to 1.9.0 | None |
Products include Linuxfoundation Cortex.
How do I fix CVE-2021-36157?
No fix has been published for CVE-2021-36157 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2021-36157 being exploited?
There is no known exploitation of CVE-2021-36157 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-jphm-g89m-v42p.