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CVE-2021-3493

HIGHCISA KEV

8.8

Descripcion

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.

Detalles CVE

Puntuacion CVSS v3.18.8

SeveridadHIGH

Vector CVSSCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Vector de ataqueLOCAL

ComplejidadLOW

Privilegios requeridosLOW

Interaccion usuarioNONE

Publicado4/17/2021

Ultima modificacion10/28/2025

Fuentekev

Avistamientos honeypot0

CISA KEV

VendedorLinux

ProductoKernel

Nombre vulnerabilidadLinux Kernel Privilege Escalation Vulnerability

Fecha inclusion KEV2022-10-20

Fecha limite remediacion2022-11-10

Uso en ransomwareUnknown

Productos afectados

canonical:ubuntu_linux

Debilidades (CWE)

CWE-270CWE-863

Referencias

http://packetstormsecurity.com/files/162434/Kernel-Live-Patch-Security-Notice-LSN-0076-1.html(security@ubuntu.com)

http://packetstormsecurity.com/files/162866/Ubuntu-OverlayFS-Local-Privilege-Escalation.html(security@ubuntu.com)

http://packetstormsecurity.com/files/165151/Ubuntu-Overlayfs-Local-Privilege-Escalation.html(security@ubuntu.com)

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7c03e2cda4a584cadc398e8f6641ca9988a39d52(security@ubuntu.com)

https://ubuntu.com/security/notices/USN-4917-1(security@ubuntu.com)

https://www.openwall.com/lists/oss-security/2021/04/16/1(security@ubuntu.com)

http://packetstormsecurity.com/files/162434/Kernel-Live-Patch-Security-Notice-LSN-0076-1.html(af854a3a-2127-422b-91ae-364da2661108)

http://packetstormsecurity.com/files/162866/Ubuntu-OverlayFS-Local-Privilege-Escalation.html(af854a3a-2127-422b-91ae-364da2661108)

http://packetstormsecurity.com/files/165151/Ubuntu-Overlayfs-Local-Privilege-Escalation.html(af854a3a-2127-422b-91ae-364da2661108)

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7c03e2cda4a584cadc398e8f6641ca9988a39d52(af854a3a-2127-422b-91ae-364da2661108)

https://ubuntu.com/security/notices/USN-4917-1(af854a3a-2127-422b-91ae-364da2661108)

https://www.openwall.com/lists/oss-security/2021/04/16/1(af854a3a-2127-422b-91ae-364da2661108)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-3493(134c704f-9b21-4f2e-91b3-4a467353bcc0)

Correlaciones IOC

Sin correlaciones registradas

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