[ASA-202105-17] runc: sandbox escape
diabonas at archlinux.org
Wed May 26 10:32:22 UTC 2021
Arch Linux Security Advisory ASA-202105-17
Date : 2021-05-25
CVE-ID : CVE-2021-30465
Package : runc
Type : sandbox escape
Remote : No
Link : https://security.archlinux.org/AVG-1972
The package runc before version 1.0.0rc95-1 is vulnerable to sandbox
Upgrade to 1.0.0rc95-1.
# pacman -Syu "runc>=1.0.0rc95-1"
The problem has been fixed upstream in version 1.0.0rc95.
Container hardening mechanisms such as LSMs (AppArmor/SELinux) and user
namespaces can restrict the amount of damage an attacker could do but
they do not block this attack outright.
runc 1.0.0-rc94 and earlier are vulnerable to a symlink exchange attack
where an attacker with the ability to start containers using a custom
volume configuration can request a seemingly-innocuous container
configuration that results in the host filesystem being bind-mounted
into the container (allowing for a container escape).
An attacker can escape from a container and access arbitrary files on
the host system using a crafted container configuration.
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