CVE-2021-31232 Improper input validation in CNCF Cortex
Attackers can read arbitrary local files via webhook or templates when the experimental API is enabled in Cortex Alertmanager.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-31232?
CVE-2021-31232 is a medium-severity path traversal vulnerability in n/a, published on 30 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The Alertmanager in CNCF Cortex before 1.8.1 has a local file disclosure vulnerability when -experimental.alertmanager.enable-api is used. The HTTP basic auth password_file can be used as an attack vector to send any file content via a webhook. The alertmanager templates can be used as an attack vector to send any file content because the alertmanager can load any text file specified in the templates list.
Which versions are affected by CVE-2021-31232?
3 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 | 1.8.1 |
github.com/cortexproject/cortex Go | All versions | 1.8.1 |
github.com/cortexproject/cortex Go | All versions | 1.8.1 |
Products include Linuxfoundation Cortex.
How do I fix CVE-2021-31232?
Upgrade github.com/cortexproject/cortex to 1.8.1 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2021-31232 being exploited?
There is no known exploitation of CVE-2021-31232 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-m45g-f45x-vv22, GO-2022-0915.