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. 

GitHub, Inc. AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

GitHub, Inc. CWE-403

GitHub, Inc. CWE-668

GitHub, Inc. https://github.com/opencontainers/runc/commit/02120488a4c0fc487d1ed2867e901eeed7ce8ecf [No types assigned]

GitHub, Inc. https://github.com/opencontainers/runc/releases/tag/v1.1.12 [No types assigned]

GitHub, Inc. https://github.com/opencontainers/runc/security/advisories/GHSA-xr7r-f8xq-vfvv [No types assigned]