Description

runc is a CLI tool for spawning and running containers on Linux according to the OCI specification. In runc 1.1.11 and earlier, due to an internal file descriptor leak, an attacker could cause a newly-spawned container process (from runc exec) to have a working directory in the host filesystem namespace, allowing for a container escape by giving access to the host filesystem ("attack 2"). The same attack could be used by a malicious image to allow a container process to gain access to the host filesystem through runc run ("attack 1"). Variants of attacks 1 and 2 could be also be used to overwrite semi-arbitrary host binaries, allowing for complete container escapes ("attack 3a" and "attack 3b"). runc 1.1.12 includes patches for this issue.

Classification

CVE ID: CVE-2024-21626

CVSS Base Severity: HIGH

CVSS Base Score: 8.6

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected Products

Vendor: opencontainers

Product: runc

Exploit Prediction Scoring System (EPSS)

EPSS Score: 1.37% (probability of being exploited)

EPSS Percentile: 86.38% (scored less or equal to compared to others)

EPSS Date: 2025-03-14 (when was this score calculated)

References

https://github.com/opencontainers/runc/security/advisories/GHSA-xr7r-f8xq-vfvv
https://github.com/opencontainers/runc/commit/02120488a4c0fc487d1ed2867e901eeed7ce8ecf
https://github.com/opencontainers/runc/releases/tag/v1.1.12
http://www.openwall.com/lists/oss-security/2024/02/01/1
http://www.openwall.com/lists/oss-security/2024/02/02/3
http://packetstormsecurity.com/files/176993/runc-1.1.11-File-Descriptor-Leak-Privilege-Escalation.html
https://lists.fedoraproject.org/archives/list/[email protected]/message/SYMO3BANINS6RGFQFKPRG4FIOJ7GWYTL/
https://lists.fedoraproject.org/archives/list/[email protected]/message/2NLXNE23Q5ESQUAI22Z7A63JX2WMPJ2J/
https://lists.debian.org/debian-lts-announce/2024/02/msg00005.html

Timeline