CVE-2024-21626

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CVE-2024-21626

Summary: runc container breakout through process.cwd trickery and leaked fds

Details: 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.

References: http://packetstormsecurity.com/files/176993/runc-1.1.11-File-Descriptor-Leak-Privilege-Escalation.html, http://www.openwall.com/lists/oss-security/2024/02/01/1, http://www.openwall.com/lists/oss-security/2024/02/02/3, https://github.com/opencontainers/runc/releases/tag/v1.1.12, https://lists.debian.org/debian-lts-announce/2024/02/msg00005.html, https://lists.fedoraproject.org/archives/list/[email protected]/message/2NLXNE23Q5ESQUAI22Z7A63JX2WMPJ2J/, https://lists.fedoraproject.org/archives/list/[email protected]/message/SYMO3BANINS6RGFQFKPRG4FIOJ7GWYTL/, https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-21626.json, https://www.vicarius.io/vsociety/posts/leaky-vessels-part-1-cve-2024-21626, https://access.redhat.com/errata/RHSA-2024:0645, https://access.redhat.com/errata/RHSA-2024:0662, https://access.redhat.com/errata/RHSA-2024:0666, https://access.redhat.com/errata/RHSA-2024:0670, https://access.redhat.com/errata/RHSA-2024:0684, https://access.redhat.com/errata/RHSA-2024:0717, https://access.redhat.com/errata/RHSA-2024:0748, https://access.redhat.com/errata/RHSA-2024:0752, https://access.redhat.com/errata/RHSA-2024:0755, https://access.redhat.com/errata/RHSA-2024:0756, https://access.redhat.com/errata/RHSA-2024:0757, https://access.redhat.com/errata/RHSA-2024:0758, https://access.redhat.com/errata/RHSA-2024:0759, https://access.redhat.com/errata/RHSA-2024:0760, https://access.redhat.com/errata/RHSA-2024:0764, https://access.redhat.com/errata/RHSA-2024:10149, https://access.redhat.com/errata/RHSA-2024:10520, https://access.redhat.com/errata/RHSA-2024:10525, https://access.redhat.com/errata/RHSA-2024:10841, https://access.redhat.com/errata/RHSA-2024:1270, https://access.redhat.com/errata/RHSA-2024:4597, https://access.redhat.com/errata/RHSA-2025:0115, https://access.redhat.com/errata/RHSA-2025:0650, https://access.redhat.com/errata/RHSA-2025:1711, https://access.redhat.com/errata/RHSA-2025:2441, https://access.redhat.com/errata/RHSA-2025:2701, https://access.redhat.com/errata/RHSA-2025:2710, https://access.redhat.com/security/cve/CVE-2024-21626, https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/21xxx/CVE-2024-21626.json, https://github.com/opencontainers/runc/security/advisories/GHSA-xr7r-f8xq-vfvv, https://nvd.nist.gov/vuln/detail/CVE-2024-21626, https://bugzilla.redhat.com/show_bug.cgi?id=2258725, https://github.com/opencontainers/runc/commit/02120488a4c0fc487d1ed2867e901eeed7ce8ecf