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CVE-2021-3493

Date: April 16, 2021

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.

Language: C

Severity Score

Related Resources (9)

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7c03e2cda4a584cadc398e8f6641ca9988a39d52
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-3493
http://packetstormsecurity.com/files/165151/Ubuntu-Overlayfs-Local-Privilege-Escalation.html
https://ubuntu.com/security/notices/USN-4917-1
https://nvd.nist.gov/vuln/detail/CVE-2021-3493
http://packetstormsecurity.com/files/162866/Ubuntu-OverlayFS-Local-Privilege-Escalation.html
http://packetstormsecurity.com/files/162434/Kernel-Live-Patch-Security-Notice-LSN-0076-1.html
https://www.openwall.com/lists/oss-security/2021/04/16/1
https://www.mend.io/vulnerability-database/CVE-2021-3493

Severity Score

Weakness Type (CWE)

Improper Privilege Management

CWE-269

Privilege Context Switching Error

CWE-270

Incorrect Authorization

CWE-863

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): COMPLETE
Integrity (I): COMPLETE
Availability (A): COMPLETE
Additional information:

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