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DoS when signing the CSR from EdgeCore

Moderate
kevin-wangzefeng published GHSA-x3px-2p95-f6jr Jul 11, 2022

Package

gomod KubeEdge (Go)

Affected versions

<=1.11.0, 1.10.1, 1.9.3

Patched versions

1.11.1, 1.10.2, 1.9.4

Description

Impact

EdgeCore may be susceptible to a DoS attack on CloudHub if an attacker was to send a well-crafted HTTP request to /edge.crt.
If an attacker can send a well-crafted HTTP request to CloudHub, and that request has a very large body, that request could crash the HTTP service through a memory exhaustion vector. The request body is being read into memory, and a body that was larger than the available memory could lead to a successful attack.
Because the request would have to make it through authorization, only authorized users could perform this attack. The consequence of the exhaustion is that CloudHub will be in denial of service. It will be affected only when users enable the CloudHub module in the file cloudcore.yaml as below:

modules:
  ...
  cloudHub:
    enable: true

Patches

This bug has been fixed in Kubeedge 1.11.1, 1.10.2, 1.9.4. Users should update to these versions to resolve the issue.

Workarounds

Disable the CloudHub module in the config file cloudcore.yaml.

References

NA

Credits

Thanks David Korczynski and Adam Korczynski of ADA Logics for responsibly disclosing this issue in accordance with the kubeedge security policy during a security audit sponsored by CNCF and facilitated by OSTIF.

For more information

If you have any questions or comments about this advisory:

Severity

Moderate
4.9
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVE ID

CVE-2022-31075

Weaknesses

No CWEs

Credits