CVE-2021-39172 New line injection during configuration edition
Authenticated users can inject newlines in configuration settings to achieve arbitrary code execution on the Cachet status page server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-39172?
CVE-2021-39172 is a high-severity code injection vulnerability in fiveai Cachet, published on 27 Aug 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Cachet is an open source status page system. Prior to version 2.5.1, authenticated users, regardless of their privileges (User or Admin), can exploit a new line injection in the configuration edition feature (e.g. mail settings) and gain arbitrary code execution on the server. This issue was addressed in version 2.5.1 by improving `UpdateConfigCommandHandler` and preventing the use of new lines characters in new configuration values. As a workaround, only allow trusted source IP addresses to access to the administration dashboard.
Weakness: CWE-93
Which versions are affected by CVE-2021-39172?
2 open source packages ship an affected version, including cachethq/cachet. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
cachethq/cachet Packagist | All versions | 2.5.1 |
cachethq/cachet Packagist | All versions | 2.5.1 |
Products include Catchethq Catchet.
How do I fix CVE-2021-39172?
Upgrade cachethq/cachet to 2.5.1 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2021-39172 being exploited?
There is no known exploitation of CVE-2021-39172 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in fiveai Cachet
Sources
Also known as GHSA-9jxw-cfrh-jxq6.