Symlink Attack Affecting github.com/opencontainers/runc/libcontainer package, versions <1.0.0-rc95
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Test your applications- Snyk ID SNYK-GOLANG-GITHUBCOMOPENCONTAINERSRUNCLIBCONTAINER-1294545
- published 19 May 2021
- disclosed 19 May 2021
- credit Etienne Champetier
Introduced: 19 May 2021
CVE-2021-30465 Open this link in a new tabHow to fix?
Upgrade github.com/opencontainers/runc/libcontainer to version 1.0.0-rc95 or higher.
Overview
github.com/opencontainers/runc/libcontainer is a package for a modern container runtime.
Affected versions of this package are vulnerable to Symlink Attack. The runc package is vulnerable to a symlink exchange attack whereby an attacker can request a seemingly innocuous container configuration that results in the host filesystem being bind-mounted into the container. An attacker must have the ability to start containers using some kind of custom volume configuration, and while recommended container hardening mechanisms such as LSMs (AppArmor/SELinux) and user namespaces will restrict the amount of damage an attacker could do, they do not block this attack outright.