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amazonAmazonALAS-2021-1537
HistorySep 30, 2021 - 7:22 p.m.

Medium: docker

2021-09-3019:22:00
alas.aws.amazon.com
15

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

0.001 Low

EPSS

Percentile

43.2%

Issue Overview:

A bug was found in Moby (Docker Engine) where attempting to copy files using docker cp into a specially-crafted container can result in Unix file permission changes for existing files in the host 2019s filesystem, widening access to others. This bug does not directly allow files to be read, modified, or executed without an additional cooperating process. (CVE-2021-41089)

A bug was found in Moby (Docker Engine) where the data directory (typically /var/lib/docker) contained subdirectories with insufficiently restricted permissions, allowing otherwise unprivileged Linux users to traverse directory contents and execute programs. When containers included executable programs with extended permission bits (such as setuid), unprivileged Linux users could discover and execute those programs. When the UID of an unprivileged Linux user on the host collided with the file owner or group inside a container, the unprivileged Linux user on the host could discover, read, and modify those files. (CVE-2021-41091)

A bug was found in the Docker CLI where running docker login my-private-registry.example.com with a misconfigured configuration file (typically ~/.docker/config.json) listing a credsStore or credHelpers that could not be executed would result in any provided credentials being sent to registry-1.docker.io rather than the intended private registry. (CVE-2021-41092)

Affected Packages:

docker

Issue Correction:
Run yum update docker to update your system.

New Packages:

src:  
    docker-20.10.7-3.71.amzn1.src  
  
x86_64:  
    docker-20.10.7-3.71.amzn1.x86_64  
    docker-debuginfo-20.10.7-3.71.amzn1.x86_64  

Additional References

Red Hat: CVE-2021-41089, CVE-2021-41091, CVE-2021-41092

Mitre: CVE-2021-41089, CVE-2021-41091, CVE-2021-41092

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

0.001 Low

EPSS

Percentile

43.2%