This is the twelfth patch release in the 1.1.z release branch of runc.
It fixes a high-severity container breakout vulnerability involving
leaked file descriptors, and users are strongly encouraged to update as
soon as possible.
-
Fix CVE-2024-21626, a container breakout attack that took advantage of
a file descriptor that was leaked internally within runc (but never
leaked to the container process).In addition to fixing the leak, several strict hardening measures were
added to ensure that future internal leaks could not be used to break
out in this manner again.Based on our research, while no other container runtime had a similar
leak, none had any of the hardening steps we've introduced (and some
runtimes would not check for any file descriptors that a calling
process may have leaked to them, allowing for container breakouts due
to basic user error).
Static Linking Notices
The runc binary distributed with this release are statically linked with
the following GNU LGPL-2.1 licensed libraries, with runc acting
as a "work that uses the Library":
The versions of these libraries were not modified from their upstream versions,
but in order to comply with the LGPL-2.1 (§6(a)), we have attached the
complete source code for those libraries which (when combined with the attached
runc source code) may be used to exercise your rights under the LGPL-2.1.
However we strongly suggest that you make use of your distribution's packages
or download them from the authoritative upstream sources, especially since
these libraries are related to the security of your containers.
Thanks to all of the contributors who made this release possible:
- Aleksa Sarai cyphar@cyphar.com
- hang.jiang hang.jiang@daocloud.io
- lfbzhm lifubang@acmcoder.com
Signed-off-by: Aleksa Sarai cyphar@cyphar.com