CVE-2021-30465: Race Condition
First published: Wed May 19 2021(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ubuntu/runc | <1.0.0~ | 1.0.0~ |
| ubuntu/runc | <1.0.0~ | 1.0.0~ |
| ubuntu/runc | <1.0.0~ | 1.0.0~ |
| ubuntu/runc | <1.0.0~ | 1.0.0~ |
| ubuntu/runc | <1.0.0~ | 1.0.0~ |
| ubuntu/runc | <1.0.0~ | 1.0.0~ |
| ubuntu/runc | <1.0.0- | 1.0.0- |
| ubuntu/runc | <1.0.0~ | 1.0.0~ |
| debian/runc | <=1.0.0~rc6+dfsg1-3 | 1.0.0~rc6+dfsg1-3+deb10u2 1.0.0~rc93+ds1-5+deb11u3 1.1.5+ds1-1+deb12u1 1.1.12+ds1-1 |
| Microsoft Azure Kubernetes Service | <=0.1.1 | |
| Microsoft Azure Kubernetes Service | =1.0.0-rc1 | |
| Microsoft Azure Kubernetes Service | =1.0.0-rc10 | |
| Microsoft Azure Kubernetes Service | =1.0.0-rc2 | |
| Microsoft Azure Kubernetes Service | =1.0.0-rc3 | |
| Microsoft Azure Kubernetes Service | =1.0.0-rc4 | |
| Microsoft Azure Kubernetes Service | =1.0.0-rc5 | |
| Microsoft Azure Kubernetes Service | =1.0.0-rc6 | |
| Microsoft Azure Kubernetes Service | =1.0.0-rc7 | |
| Microsoft Azure Kubernetes Service | =1.0.0-rc8 | |
| Microsoft Azure Kubernetes Service | =1.0.0-rc9 | |
| Microsoft Azure Kubernetes Service | =1.0.0-rc90 | |
| Microsoft Azure Kubernetes Service | =1.0.0-rc91 | |
| Microsoft Azure Kubernetes Service | =1.0.0-rc92 | |
| Microsoft Azure Kubernetes Service | =1.0.0-rc93 | |
| Microsoft Azure Kubernetes Service | =1.0.0-rc94 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 |
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Reference Links
- https://github.com/opencontainers/runc/security/advisories/GHSA-c3xm-pvg7-gh7r
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4HOARVIT47RULTTFWAU7XBG4WY6TDDHV/
- http://www.openwall.com/lists/oss-security/2021/05/19/2
- https://github.com/opencontainers/runc/releases
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/35ZW6NBZSBH5PWIT7JU4HXOXGFVDCOHH/
- https://bugzilla.opensuse.org/show_bug.cgi?id=1185405
- https://github.com/opencontainers/runc/commit/0ca91f44f1664da834bc61115a849b56d22f595f
- https://security.netapp.com/advisory/ntap-20210708-0003/
- https://security.gentoo.org/glsa/202107-26
- https://lists.debian.org/debian-lts-announce/2023/03/msg00023.html
- https://launchpad.net/bugs/cve/CVE-2021-30465
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/35ZW6NBZSBH5PWIT7JU4HXOXGFVDCOHH/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4HOARVIT47RULTTFWAU7XBG4WY6TDDHV/
- https://www.openwall.com/lists/oss-security/2021/05/19/2
- https://security-tracker.debian.org/tracker/CVE-2021-30465
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30465
- https://ubuntu.com/security/notices/USN-4960-1
- https://nvd.nist.gov/vuln/detail/CVE-2021-30465
- https://ubuntu.com/security/CVE-2021-30465
Frequently Asked Questions
What is CVE-2021-30465?
CVE-2021-30465 is a vulnerability in runc before version 1.0.0-rc95 that allows a container filesystem breakout via directory traversal.
How severe is CVE-2021-30465?
CVE-2021-30465 has a severity rating of 8.5 (high).
How can an attacker exploit CVE-2021-30465?
To exploit CVE-2021-30465, an attacker must be able to create multiple containers with a specific mount configuration and perform a symlink-exchange attack that relies on a race condition.
Which versions of runc are affected by CVE-2021-30465?
runc versions before 1.0.0-rc95 are affected by CVE-2021-30465.
Is there a fix for CVE-2021-30465?
Yes, upgrading to runc version 1.0.0-rc95 or later will fix CVE-2021-30465.
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