Executive Summary

Informations
Name CVE-2021-3493 First vendor Publication 2021-04-17
Vendor Cve Last vendor Modification 2021-05-03

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Overall CVSS Score 7.8
Base Score 7.8 Environmental Score 7.8
impact SubScore 5.9 Temporal Score 7.8
Exploitabality Sub Score 1.8
 
Attack Vector Local Attack Complexity Low
Privileges Required Low User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact High Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:C/I:C/A:C)
Cvss Base Score 7.2 Attack Range Local
Cvss Impact Score 10 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

The overlayfs implementation in the linux kernel did not properly validate with respect to user namespaces the setting of file capabilities on files in an underlying file system. Due to the combination of unprivileged user namespaces along with a patch carried in the Ubuntu kernel to allow unprivileged overlay mounts, an attacker could use this to gain elevated privileges.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3493

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-269 Improper Privilege Management

CPE : Common Platform Enumeration

TypeDescriptionCount
Os 60

Sources (Detail)

Source Url
MISC http://packetstormsecurity.com/files/162434/Kernel-Live-Patch-Security-Notice...
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id...
https://ubuntu.com/security/notices/USN-4917-1
https://www.openwall.com/lists/oss-security/2021/04/16/1

Alert History

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Date Informations
2021-05-04 14:09:58
  • Multiple Updates
2021-05-04 13:24:51
  • Multiple Updates
2021-05-04 05:22:51
  • Multiple Updates
2021-04-23 01:10:32
  • Multiple Updates
2021-04-19 17:22:59
  • Multiple Updates
2021-04-17 12:37:39
  • First insertion