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Authentication Bypass Using an Alternate Path or Channel
Affected range
<29.3.1
Fixed version
Not Fixed
CVSS Score
8.8
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS Score
0.008%
EPSS Percentile
1st percentile
Description
Summary
A security vulnerability has been detected that allows attackers to bypass authorization plugins (AuthZ) under specific circumstances. The base likelihood of this being exploited is low.
If you don't use AuthZ plugins, you are not affected.
Using a specially-crafted API request, an attacker could make the Docker daemon forward the request to an authorization plugin without the body. The authorization plugin may allow a request which it would have otherwise denied if the body had been forwarded to it.
Anyone who depends on authorization plugins that introspect the request body to make access control decisions is potentially impacted.
Workarounds
If unable to update immediately:
Avoid using AuthZ plugins that rely on request body inspection for security decisions.
Restrict access to the Docker API to trusted parties, following the principle of least privilege.
A security vulnerability has been detected that allows plugins privilege validation to be bypassed during docker plugin install. Due to an error in the daemon's privilege comparison logic, the daemon may incorrectly accept a privilege set that differs from the one approved by the user.
Plugins that request exactly one privilege are also affected, because no comparison is performed at all.
Impact
If plugins are not in use, there is no impact.
When a plugin is installed, the daemon computes the privileges required by the plugin's configuration and compares them with the privileges approved during installation. A malicious plugin can exploit this bug so that the daemon accepts privileges that differ from what was intended to be approved.
Anyone who depends on the plugin installation approval flow as a meaningful security boundary is potentially impacted.
Depending on the privilege set involved, this may include highly sensitive plugin permissions such as broad device access.
For consideration: exploitation still requires a plugin to be installed from a malicious source, and Docker plugins are relatively uncommon. Docker Desktop also does not support plugins.
Workarounds
If unable to update immediately:
Do not install plugins from untrusted sources
Carefully review all privileges requested during docker plugin install
Restrict access to the Docker daemon to trusted parties, following the principle of least privilege
Avoid relying on plugin privilege approval as the only control boundary for sensitive environments
Credits
Reported by Cody (c@wormhole.guru, PGP 0x9FA5B73E)
Authentication Bypass Using an Alternate Path or Channel
Affected range
<29.3.1
Fixed version
Not Fixed
CVSS Score
8.8
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS Score
0.008%
EPSS Percentile
1st percentile
Description
Summary
A security vulnerability has been detected that allows attackers to bypass authorization plugins (AuthZ) under specific circumstances. The base likelihood of this being exploited is low.
If you don't use AuthZ plugins, you are not affected.
Using a specially-crafted API request, an attacker could make the Docker daemon forward the request to an authorization plugin without the body. The authorization plugin may allow a request which it would have otherwise denied if the body had been forwarded to it.
Anyone who depends on authorization plugins that introspect the request body to make access control decisions is potentially impacted.
Workarounds
If unable to update immediately:
Avoid using AuthZ plugins that rely on request body inspection for security decisions.
Restrict access to the Docker API to trusted parties, following the principle of least privilege.
A security vulnerability has been detected that allows plugins privilege validation to be bypassed during docker plugin install. Due to an error in the daemon's privilege comparison logic, the daemon may incorrectly accept a privilege set that differs from the one approved by the user.
Plugins that request exactly one privilege are also affected, because no comparison is performed at all.
Impact
If plugins are not in use, there is no impact.
When a plugin is installed, the daemon computes the privileges required by the plugin's configuration and compares them with the privileges approved during installation. A malicious plugin can exploit this bug so that the daemon accepts privileges that differ from what was intended to be approved.
Anyone who depends on the plugin installation approval flow as a meaningful security boundary is potentially impacted.
Depending on the privilege set involved, this may include highly sensitive plugin permissions such as broad device access.
For consideration: exploitation still requires a plugin to be installed from a malicious source, and Docker plugins are relatively uncommon. Docker Desktop also does not support plugins.
Workarounds
If unable to update immediately:
Do not install plugins from untrusted sources
Carefully review all privileges requested during docker plugin install
Restrict access to the Docker daemon to trusted parties, following the principle of least privilege
Avoid relying on plugin privilege approval as the only control boundary for sensitive environments
Credits
Reported by Cody (c@wormhole.guru, PGP 0x9FA5B73E)
Docker CLI for Windows searches for plugin binaries in C:\ProgramData\Docker\cli-plugins, a directory that does not exist by default. A low-privileged attacker can create this directory and place malicious CLI plugin binaries (docker-compose.exe, docker-buildx.exe, etc.) that are executed when a victim user opens Docker Desktop or invokes Docker CLI plugin features, and allow privilege-escalation if the docker CLI is executed as a privileged user.
This issue affects Docker CLI through v29.1.5 (fixed in v29.2.0). It impacts Windows binaries acting as a CLI plugin manager via the [github.com/docker/cli/cli-plugins/manager](https://pkg.go.dev/github.com/docker/cli@v29.1.5+incompatible/cli-plugins/manager) package, which is consumed by downstream projects such as Docker Compose.
Docker Compose became affected starting in v2.31.0, when it incorporated the relevant CLI plugin manager code (see docker/compose#12300), and is fixed in v5.1.0.
This issue does not impact non-Windows binaries or projects that do not use the plugin manager code.
Patches
Fixed version starts with 29.2.0
This issue was fixed in docker/cli@1375933 (docker/cli#6713), which removed %PROGRAMDATA%\Docker\cli-plugins from the list of paths used for plugin-discovery on Windows.
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