CVE-2021-30465
Mount destinations can be swapped via symlink-exchange to cause mounts outside the rootfs in github.com/opencontainers/runc
7.6
HIGH
CVSS 3.1
EPSS 1.5%
Description
runc before 1.0.0-rc95 allows a Container Filesystem Breakout via Directory Traversal. To exploit the vulnerability, an attacker must be able to create multiple containers with a fairly specific mount configuration. The problem occurs via a symlink-exchange attack that relies on a race condition.
How to fix CVE-2021-30465
To remediate CVE-2021-30465, upgrade the affected package to a fixed version below.
- —upgrade to 1.0.0~rc93+ds1-5 or later
- —upgrade to 1.0.0-rc95 or later
- —upgrade to 1.0.0-rc95 or later
Is CVE-2021-30465 being exploited?
Low — EPSS is 1.5%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 1.0.0~rc93+ds1-5
- from 0, < 1.0.0-rc95
- from 0, < 1.0.0-rc95
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.6 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N |