Vulnerability in Linuxfoundation Runc
CVE-2021-30465
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.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.066 (93.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 93.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.066 · newest: 0.066 · change: 0.000
Affected products
- Linuxfoundation Runc — versions 1.0.0
- Fedoraproject Fedora — versions 33, 34
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/opencontainers/runc/releases (Third Party Advisory, Release Notes)
- www.openwall.com/lists/oss-security/2021/05/19/2 (mailing-list, Mailing List, Third Party Advisory)
- github.com/opencontainers/runc/security/advisories/GHSA-c3xm-pvg7-gh7r (Patch, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- github.com/opencontainers/runc/commit/0ca91f44f1664da834bc61115a849b56d22f595f (Patch, Third Party Advisory)
- bugzilla.opensuse.org/show_bug.cgi (Issue Tracking)
- security.netapp.com/advisory/ntap-20210708-0003/ (Third Party Advisory)
- security.gentoo.org/glsa/202107-26 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/03/msg00023.html (mailing-list)
Frequently asked questions
- What is CVE-2021-30465?
- CVE-2021-30465 is a high-severity vulnerability in Linuxfoundation Runc, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 8.5/10. Published 2021-05-27.
- How severe is CVE-2021-30465?
- High severity. CVSS v3 base score is 8.5 out of 10.
- Is CVE-2021-30465 known to be exploited?
- 29 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.