Arch Linux Security Advisory ASA-202102-22 ========================================== Severity: Low Date : 2021-02-07 CVE-ID : CVE-2021-21303 Package : helm Type : insufficient validation Remote : No Link : https://security.archlinux.org/AVG-1539 Summary ======= The package helm before version 3.5.2-1 is vulnerable to insufficient validation. Resolution ========== Upgrade to 3.5.2-1. # pacman -Syu "helm>=3.5.2-1" The problem has been fixed upstream in version 3.5.2. Workaround ========== None. Description =========== In Helm from version 3.0 and before version 3.5.2, there are a few cases where data loaded from potentially untrusted sources was not properly sanitized. When a SemVer in the `version` field of a chart is invalid, in some cases Helm allows the string to be used "as is" without sanitizing. Helm fails to properly sanitize some fields present in Helm repository `index.yaml` files. Helm does not properly sanitize some fields in the `plugin.yaml` file for plugins. In some cases, Helm does not properly sanitize the fields in the `Chart.yaml` file. By exploiting these attack vectors, core maintainers were able to send deceptive information to a terminal screen running the `helm` command, as well as obscure or alter information on the screen. In some cases, attackers could send codes that terminals used to execute higher-order logic, like clearing a terminal screen. Further, during evaluation, the Helm maintainers discovered a few other fields that were not properly sanitized when read out of repository index files. This fix remedies all such cases, and once again enforces SemVer2 policies on version fields. All users of Helm 3 should upgrade to the fixed version 3.5.2 or later. Those who use Helm as a library should verify that they either sanitize this data on their own, or use the proper Helm API calls to sanitize the data. Impact ====== An attacker might be able to spoof the contents of the terminal when the user runs the "helm" command on a crafted Helm chart that includes unsanitized terminal input codes. References ========== https://github.com/helm/helm/security/advisories/GHSA-c38g-469g-cmgx https://github.com/helm/helm/commit/2bf5c280d56e0043bf1870f84d63e82d5c5d4230 https://security.archlinux.org/CVE-2021-21303