Information disclosure in Linuxfoundation Runc
CVE-2024-21626
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.189 (97.3th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.181 · newest: 0.189 · change: +0.008
Affected products
- Linuxfoundation Runc
- Opencontainers Runc — versions >=v1.0.0-rc93, < 1.1.12
- Fedoraproject Fedora — versions 39
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/opencontainers/runc/security/advisories/GHSA-xr7r-f8xq-vfvv (Exploit, Vendor Advisory)
- github.com/opencontainers/runc/commit/02120488a4c0fc487d1ed2867e901eeed7ce8ecf (Patch)
- github.com/opencontainers/runc/releases/tag/v1.1.12 (Release Notes)
- www.openwall.com/lists/oss-security/2024/02/01/1 (Mailing List)
- www.openwall.com/lists/oss-security/2024/02/02/3 (Mailing List)
- packetstormsecurity.com/files/176993/runc-1.1.11-File-Descriptor-Leak-Privilege… (Exploit, VDB Entry, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/…
- lists.debian.org/debian-lts-announce/2024/02/msg00005.html
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2024-21626?
- CVE-2024-21626 is a high-severity vulnerability in Linuxfoundation Runc, classified under Exposure of File Descriptor to Unintended Control Sphere (File Descriptor Leak). CVSS score: 8.6/10. Published 2024-01-31.
- How severe is CVE-2024-21626?
- High severity. CVSS v3 base score is 8.6 out of 10.
- Is CVE-2024-21626 known to be exploited?
- 73 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.