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CVE-2024-21626

Published: 31 January 2024

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.

Notes

AuthorNote
Priority reason:
Allows an attacker to escape containers
0xnishit
affected versions >=v1.0.0-rc93,<=1.1.11

Priority

High

Cvss 3 Severity Score

8.6

Score breakdown

Status

Package Release Status
runc
Launchpad, Ubuntu, Debian
trusty Ignored
(end of standard support)
bionic
Released (1.1.4-0ubuntu1~18.04.2+esm1)
Available with Ubuntu Pro
focal
Released (1.1.7-0ubuntu1~20.04.2)
jammy
Released (1.1.7-0ubuntu1~22.04.2)
lunar Ignored
(end of life, was needs-triage)
mantic
Released (1.1.7-0ubuntu2.2)
upstream
Released (1.1.12)
xenial Not vulnerable
(version not affected)

Severity score breakdown

Parameter Value
Base score 8.6
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Changed
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H