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CVE-2021-20288

HIGHCVSS 7.2/10EPSS 2.11%

Last modified

CVE-2021-20288 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. An authentication flaw was found in ceph in versions before 14.2.20. When the monitor handles CEPHX_GET_AUTH_SESSION_KEY requests, it doesn't sanitize other_keys, allowing key reuse. EPSS estimates a 2.11% chance of exploitation in the next 30 days.

Description

An authentication flaw was found in ceph in versions before 14.2.20. When the monitor handles CEPHX_GET_AUTH_SESSION_KEY requests, it doesn't sanitize other_keys, allowing key reuse. An attacker who can request a global_id can exploit the ability of any user to request a global_id previously associated with another user, as ceph does not force the reuse of old keys to generate new ones. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Metrics

CVSS 3.1
7.2/10

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

EPSS Probability
2.11%

79.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
LinuxfoundationCeph< 14.2.21
RedhatCeph Storage4.0
FedoraprojectFedora32
FedoraprojectFedora33
FedoraprojectFedora34
DebianDebian Linux10.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-20288?
An authentication flaw was found in ceph in versions before 14.2.20. When the monitor handles CEPHX_GET_AUTH_SESSION_KEY requests, it doesn't sanitize other_keys, allowing key reuse. An attacker who can request a global_id can exploit the ability of any user to request a global_id previously associated with another user, as ceph does not force the reuse of old keys to generate new ones. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
How severe is CVE-2021-20288?
CVE-2021-20288 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 2.11% probability of exploitation in the next 30 days.
How do I fix CVE-2021-20288?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20288?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST