Fedora 35 update for containerd, moby-engine



Risk Medium
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2021-41103
CVE-2021-41092
CVE-2021-41089
CVE-2021-41091
CWE-ID CWE-276
CWE-200
CWE-281
Exploitation vector Network
Public exploit Public exploit code for vulnerability #4 is available.
Vulnerable software
 Fedora
Operating systems & Components / Operating system

moby-engine
Operating systems & Components / Operating system package or component

containerd
Operating systems & Components / Operating system package or component

Vendor Fedoraproject

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Incorrect default permissions

EUVDB-ID: #VU57038

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-41103

CWE-ID: CWE-276 - Incorrect Default Permissions

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to incorrect default permissions for container root directories and some plugins. 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 can discover, read, and modify those files.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 35

moby-engine: before 20.10.9-1.fc35

containerd: before 1.5.7-1.fc35

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2021-b5a9a481a2


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Information disclosure

EUVDB-ID: #VU64417

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-41092

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application. A remote attacker can gain unauthorized access to sensitive information on the system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 35

moby-engine: before 20.10.9-1.fc35

containerd: before 1.5.7-1.fc35

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2021-b5a9a481a2


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Improper Preservation of Permissions

EUVDB-ID: #VU64415

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:U/U:Clear]

CVE-ID: CVE-2021-41089

CWE-ID: CWE-281 - Improper preservation of permissions

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions, which leads to security restrictions bypass and privilege escalation.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 35

moby-engine: before 20.10.9-1.fc35

containerd: before 1.5.7-1.fc35

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2021-b5a9a481a2


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Improper Preservation of Permissions

EUVDB-ID: #VU64416

Risk: Low

CVSSv4.0: 1.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/U:Clear]

CVE-ID: CVE-2021-41091

CWE-ID: CWE-281 - Improper preservation of permissions

Exploit availability: Yes

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions, which leads to security restrictions bypass and privilege escalation.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 35

moby-engine: before 20.10.9-1.fc35

containerd: before 1.5.7-1.fc35

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2021-b5a9a481a2


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



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