Vulnerability Monitor

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CVE-2021-32760

containerd is a container runtime. A bug was found in containerd versions prior to 1.4.8 and 1.5.4 where pulling and extracting a specially-crafted container image can result in Unix file permission changes for existing files in the host’s filesystem. Changes to file permissions can deny access to the expected owner of the file, widen access to others, or set extended bits like setuid, setgid, and sticky. This bug does not directly allow files to be read, modified, or executed without an additional cooperating process. This bug has been fixed in containerd 1.5.4 and 1.4.8. As a workaround, ensure that users only pull images from trusted sources. Linux security modules (LSMs) like SELinux and AppArmor can limit the files potentially affected by this bug through policies and profiles that prevent containerd from interacting with specific files.

Published

2021-07-19T21:15:07.857

Last Modified

2024-11-21T06:07:41.097

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.0 (MEDIUM)

CVSSv2 Vector

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

  • Access Vector: NETWORK
  • Access Complexity: MEDIUM
  • Authentication: NONE
  • Confidentiality Impact: PARTIAL
  • Integrity Impact: PARTIAL
  • Availability Impact: PARTIAL
Exploitability Score

8.6

Impact Score

6.4

Weaknesses
  • Type: Secondary
    CWE-668
  • Type: Primary
    CWE-732
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application linuxfoundation containerd < 1.4.8 Yes
Application linuxfoundation containerd < 1.5.4 Yes
Operating System fedoraproject fedora 34 Yes
References