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containerd is an open source container runtime with an emphasis on simplicity, robustness and portability. A bug was found in containerd where container root directories and some plugins had 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. This vulnerability has been fixed in containerd 1.4.11 and containerd 1.5.7. Users should update to these version when they are released and may restart containers or update directory permissions to mitigate the vulnerability. Users unable to update should limit access to the host to trusted users. Update directory permission on container bundles directories.
Publish Date : 2021-10-04 Last Update Date : 2022-06-14
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CVSS Scores & Vulnerability Types
| CVSS Score |
7.2 |
| Confidentiality Impact |
Complete
(There is total information disclosure, resulting in all system files being revealed.) |
| Integrity Impact |
Complete
(There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.) |
| Availability Impact |
Complete
(There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.) |
| Access Complexity |
Low
(Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. ) |
| Authentication |
Not required
(Authentication is not required to exploit the vulnerability.) |
| Gained Access |
None |
| Vulnerability Type(s) |
Directory traversal |
| CWE ID |
22 |
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Products Affected By CVE-2021-41103
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Number Of Affected Versions By Product
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References For CVE-2021-41103
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Metasploit Modules Related To CVE-2021-41103
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