CVE-2022-24348: Path Traversal
Impact
All versions of Argo CD are vulnerable to a path traversal bug that allows to pass arbitrary values files to be consumed by Helm charts.
Additionally, it is possible to craft special Helm chart packages containing value files that are actually symbolic links, pointing to arbitrary files outside the repository's root directory.
If an attacker with permissions to create or update Applications knows or can guess the full path to a file containing valid YAML, they can create a malicious Helm chart to consume that YAML as values files, thereby gaining access to data they would otherwise have no access to.
The impact can especially become critical in environments that make use of encrypted value files (e.g. using plugins with git-crypt or SOPS) containing sensitive or confidential data, and decrypt these secrets to disk before rendering the Helm chart.
Also, because any error message from helm template is passed back to the user, and these error messages are quite verbose, enumeration of files on the repository server's file system is possible.
Patches
A patch for this vulnerability has been released in the following Argo CD versions:
v2.3.0 v2.2.4 v2.1.9
We urge users of Argo CD to update their installation to one of the fixed versions as listed above.
Workarounds
No workaround for this issue.
References
https://apiiro.com/blog/malicious-kubernetes-helm-charts-can-be-used-to-steal-sensitive-information-from-argo-cd-deployments https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-24348
For more information
Open an issue in the Argo CD issue tracker or discussions Join us on Slack in channel #argo-cd
Credits
The path traversal vulnerability was discovered and reported by Moshe Zioni, VP Security Research, Apiiro.
During the development of a fix for the path traversal vulnerability, the Argo CD team discovered the related issue with symbolic links.
The Argo CD team would like to thank Moshe Zioni for the responsible disclosure, and the constructive discussions during handling this issue!
Other sources
Argo CD before 2.1.9 and 2.2.x before 2.2.4 allows directory traversal related to Helm charts because of an error in helmTemplate in repository.go. For example, an attacker may be able to discover credentials stored in a YAML file.
— MITRE
Affected Software
Event History
Frequently Asked Questions
What is the vulnerability ID for this Argo CD vulnerability?
The vulnerability ID for this Argo CD vulnerability is CVE-2022-24348.
What is the severity of CVE-2022-24348?
The severity of CVE-2022-24348 is high.
What is the affected software for CVE-2022-24348?
The affected software for CVE-2022-24348 is Argo CD before 2.1.9 and 2.2.x before 2.2.4.
How does CVE-2022-24348 allow directory traversal?
CVE-2022-24348 allows directory traversal related to Helm charts due to an error in helmTemplate in repository.go.
What could an attacker do with CVE-2022-24348?
An attacker may be able to discover credentials stored in a YAML file.