Update module github.com/docker/docker to v24 [SECURITY] - autoclosed #161
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This PR contains the following updates:
v23.0.0-rc.1+incompatible
->v24.0.9+incompatible
GitHub Vulnerability Alerts
GHSA-jq35-85cj-fj4p
Intel's RAPL (Running Average Power Limit) feature, introduced by the Sandy Bridge microarchitecture, provides software insights into hardware energy consumption. To facilitate this, Intel introduced the powercap framework in Linux kernel 3.13, which reads values via relevant MSRs (model specific registers) and provides unprivileged userspace access via
sysfs
. As RAPL is an interface to access a hardware feature, it is only available when running on bare metal with the module compiled into the kernel.By 2019, it was realized that in some cases unprivileged access to RAPL readings could be exploited as a power-based side-channel against security features including AES-NI (potentially inside a SGX enclave) and KASLR (kernel address space layout randomization). Also known as the PLATYPUS attack, Intel assigned CVE-2020-8694 and CVE-2020-8695, and AMD assigned CVE-2020-12912.
Several mitigations were applied; Intel reduced the sampling resolution via a microcode update, and the Linux kernel prevents access by non-root users since 5.10. However, this kernel-based mitigation does not apply to many container-based scenarios:
sysfs
is mounted inside containers read-only; however only read access is needed to carry out this attack on an unpatched CPUWhile this is not a direct vulnerability in container runtimes, defense in depth and safe defaults are valuable and preferred, especially as this poses a risk to multi-tenant container environments running directly on affected hardware. This is provided by masking
/sys/devices/virtual/powercap
in the default mount configuration, and adding an additional set of rules to deny it in the default AppArmor profile.While
sysfs
is not the only way to read from the RAPL subsystem, other ways of accessing it require additional capabilities such asCAP_SYS_RAWIO
which is not available to containers by default, orperf
paranoia level less than 1, which is a non-default kernel tunable.References
CVE-2024-24557
The classic builder cache system is prone to cache poisoning if the image is built
FROM scratch
.Also, changes to some instructions (most important being
HEALTHCHECK
andONBUILD
) would not cause a cache miss.An attacker with the knowledge of the Dockerfile someone is using could poison their cache by making them pull a specially crafted image that would be considered as a valid cache candidate for some build steps.
For example, an attacker could create an image that is considered as a valid cache candidate for:
when in fact the malicious image used as a cache would be an image built from a different Dockerfile.
In the second case, the attacker could for example substitute a different
HEALTCHECK
command.Impact
23.0+ users are only affected if they explicitly opted out of Buildkit (
DOCKER_BUILDKIT=0
environment variable) or are using the/build
API endpoint (which uses the classic builder by default).All users on versions older than 23.0 could be impacted. An example could be a CI with a shared cache, or just a regular Docker user pulling a malicious image due to misspelling/typosquatting.
Image build API endpoint (
/build
) andImageBuild
function fromgit.luolix.top/docker/docker/client
is also affected as it the uses classic builder by default.Patches
Patches are included in Moby releases:
Workarounds
--no-cache
or use Buildkit if possible (DOCKER_BUILDKIT=1
, it's default on 23.0+ assuming that the buildx plugin is installed).Version = types.BuilderBuildKit
orNoCache = true
inImageBuildOptions
forImageBuild
call.CVE-2024-29018
Moby is an open source container framework originally developed by Docker Inc. as Docker. It is a key component of Docker Engine, Docker Desktop, and other distributions of container tooling or runtimes. As a batteries-included container runtime, Moby comes with a built-in networking implementation that enables communication between containers, and between containers and external resources.
Moby's networking implementation allows for creating and using many networks, each with their own subnet and gateway. This feature is frequently referred to as custom networks, as each network can have a different driver, set of parameters, and thus behaviors. When creating a network, the
--internal
flag is used to designate a network as internal. Theinternal
attribute in a docker-compose.yml file may also be used to mark a network internal, and other API clients may specify theinternal
parameter as well.When containers with networking are created, they are assigned unique network interfaces and IP addresses (typically from a non-routable RFC 1918 subnet). The root network namespace (hereafter referred to as the 'host') serves as a router for non-internal networks, with a gateway IP that provides SNAT/DNAT to/from container IPs.
Containers on an internal network may communicate between each other, but are precluded from communicating with any networks the host has access to (LAN or WAN) as no default route is configured, and firewall rules are set up to drop all outgoing traffic. Communication with the gateway IP address (and thus appropriately configured host services) is possible, and the host may communicate with any container IP directly.
In addition to configuring the Linux kernel's various networking features to enable container networking,
dockerd
directly provides some services to container networks. Principal among these is serving as a resolver, enabling service discovery (looking up other containers on the network by name), and resolution of names from an upstream resolver.When a DNS request for a name that does not correspond to a container is received, the request is forwarded to the configured upstream resolver (by default, the host's configured resolver). This request is made from the container network namespace: the level of access and routing of traffic is the same as if the request was made by the container itself.
As a consequence of this design, containers solely attached to internal network(s) will be unable to resolve names using the upstream resolver, as the container itself is unable to communicate with that nameserver. Only the names of containers also attached to the internal network are able to be resolved.
Many systems will run a local forwarding DNS resolver, typically present on a loopback address (
127.0.0.0/8
), such as systemd-resolved or dnsmasq. Common loopback address examples include127.0.0.1
or127.0.0.53
. As the host and any containers have separate loopback devices, a consequence of the design described above is that containers are unable to resolve names from the host's configured resolver, as they cannot reach these addresses on the host loopback device.To bridge this gap, and to allow containers to properly resolve names even when a local forwarding resolver is used on a loopback address,
dockerd
will detect this scenario and instead forward DNS requests from the host/root network namespace. The loopback resolver will then forward the requests to its configured upstream resolvers, as expected.Impact
Because
dockerd
will forward DNS requests to the host loopback device, bypassing the container network namespace's normal routing semantics entirely, internal networks can unexpectedly forward DNS requests to an external nameserver.By registering a domain for which they control the authoritative nameservers, an attacker could arrange for a compromised container to exfiltrate data by encoding it in DNS queries that will eventually be answered by their nameservers. For example, if the domain
evil.example
was registered, the authoritative nameserver(s) for that domain could (eventually and indirectly) receive a request forthis-is-a-secret.evil.example
.Docker Desktop is not affected, as Docker Desktop always runs an internal resolver on a RFC 1918 address.
Patches
Moby releases 26.0.0-rc3, 25.0.5 (released) and 23.0.11 (to be released) are patched to prevent forwarding DNS requests from internal networks.
Workarounds
--dns
argument todocker run
, or API equivalent), which will force all upstream DNS queries to be resolved from the container network namespace.Background
--internal
flag that will completely isolate containers on a network from any communications external to that network," which necessitated this advisory and CVE.CVE-2024-41110
A security vulnerability has been detected in certain versions of Docker Engine, which could allow an attacker to bypass authorization plugins (AuthZ) under specific circumstances. The base likelihood of this being exploited is low. This advisory outlines the issue, identifies the affected versions, and provides remediation steps for impacted users.
Impact
Using a specially-crafted API request, an Engine API client could make the daemon forward the request or response to an authorization plugin without the body. In certain circumstances, the authorization plugin may allow a request which it would have otherwise denied if the body had been forwarded to it.
A security issue was discovered In 2018, where an attacker could bypass AuthZ plugins using a specially crafted API request. This could lead to unauthorized actions, including privilege escalation. Although this issue was fixed in Docker Engine v18.09.1 in January 2019, the fix was not carried forward to later major versions, resulting in a regression. Anyone who depends on authorization plugins that introspect the request and/or response body to make access control decisions is potentially impacted.
Docker EE v19.03.x and all versions of Mirantis Container Runtime are not vulnerable.
Vulnerability details
Patches
Remediation steps
References
Release Notes
docker/docker (github.com/docker/docker)
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