Lucene search
K
Database
Vendors
Products
Years
CVSS
Scanner
Agent Scanning
API Scanning
Manual Audit
Perimeter Scanner
Scanning
Projects
Email
Webhook
Plugins
Resources
Documents
Blog
Glossary
FAQ
Pricing
Contacts
About Us
Partners
Branding Guideline
ubuntucveUbuntu.comUB:CVE-2021-3493
HistoryApr 15, 2021 - 12:00 a.m.

CVE-2021-3493

2021-04-1500:00:00
ubuntu.com
ubuntu.com
32
linux kernel
overlayfs
user namespace
file capabilities
ubuntu
unprivileged mount

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS3

8.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

EPSS

0.008

Percentile

82.3%

JSON

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.

Notes

Author Note
sbeattie issue is specific to Ubuntu or any other distribution that patched the kernel to allow unprivileged overlay mounts, prior to the 5.11 commit (459c7c565ac36b) that permits it upstream.
OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux<ย 4.15.0-142.146UNKNOWN
ubuntu20.04noarchlinux<ย 5.4.0-72.80UNKNOWN
ubuntu20.10noarchlinux<ย 5.8.0-50.56UNKNOWN
ubuntu16.04noarchlinux<ย 4.4.0-209.241UNKNOWN
ubuntu18.04noarchlinux-aws<ย 4.15.0-1099.106UNKNOWN
ubuntu20.04noarchlinux-aws<ย 5.4.0-1045.47UNKNOWN
ubuntu20.10noarchlinux-aws<ย 5.8.0-1030.32UNKNOWN
ubuntu14.04noarchlinux-aws<ย 4.4.0-1091.95UNKNOWN
ubuntu16.04noarchlinux-aws<ย 4.4.0-1127.141UNKNOWN
ubuntu18.04noarchlinux-aws-5.4<ย 5.4.0-1045.47~18.04.1UNKNOWN
Rows per page:
1-10 of 561

Related

githubexploit 13
nvd 1
redhatcve 1
cve 1
seebug 1
metasploit 1
debiancve 1
rapid7blog 1
attackerkb 1
cisa_kev 1
veracode 1
prion 1
cvelist 1
f5 1
packetstorm 1
nessus 4
ubuntu 5
osv 4
malwarebytes 1
openvas 4
cloudfoundry 1
thn 2
githubexploit
githubexploit
Exploit for Improper Privilege Management in Canonical Ubuntu Linux
2021-05-03 05:58:06
Exploit for Improper Privilege Management in Canonical Ubuntu Linux
2021-10-02 14:44:43
Exploit for Privilege Context Switching Error in Canonical Ubuntu Linux
2021-04-19 20:07:01
nvd
nvd
CVE-2021-3493
2021-04-17 05:15:14
redhatcve
redhatcve
CVE-2021-3493
2021-04-16 19:11:59
cve
cve
CVE-2021-3493
2021-04-17 05:15:14
seebug
seebug
ubuntu็‰นๆƒๆๅ‡ๆผๆดž๏ผˆCVE-2021-3493๏ผ‰
2021-04-20 00:00:00
metasploit
metasploit
2021 Ubuntu Overlayfs LPE
2021-12-01 20:54:47
debiancve
debiancve
CVE-2021-3493
2021-04-17 05:15:14
rapid7blog
rapid7blog
Metasploit Wrap-Up
2021-12-03 21:03:18
attackerkb
attackerkb
CVE-2021-3493
2021-04-15 00:00:00
cisa_kev
cisa_kev
Linux Kernel Privilege Escalation Vulnerability
2022-10-20 00:00:00
veracode
veracode
Privilege Escalation
2021-08-12 15:38:55
prion
prion
Design/Logic Flaw
2021-04-17 05:15:00
cvelist
cvelist
CVE-2021-3493
2021-04-17 04:20:16
f5
f5
K54635192 : Linux kernel overlayfs vulnerability CVE-2021-3493
2021-06-04 00:00:00
packetstorm
packetstorm
Ubuntu Overlayfs Local Privilege Escalation
2021-12-03 00:00:00
nessus
nessus
Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-4916-1)
2021-04-16 00:00:00
Ubuntu 20.04 LTS : Linux kernel (OEM) vulnerabilities (USN-4915-1)
2021-04-16 00:00:00
Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Linux kernel regression (USN-4916-2)
2021-04-21 00:00:00
ubuntu
ubuntu
Kernel Live Patch Security Notice
2021-05-03 00:00:00
Linux kernel regression
2021-04-22 00:00:00
Linux kernel vulnerabilities
2021-04-15 00:00:00
osv
osv
linux, linux-aws, linux-gke-5.3, linux-hwe, linux-kvm, linux-lts-xenial, linux-oem-5.6, linux-raspi2, linux-raspi2-5.3, linux-snapdragon regression
2021-04-22 03:59:34
linux-oem-5.6 vulnerabilities
2021-04-15 22:22:20
linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-dell300x, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-lts-xenial, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities
2021-04-15 23:26:22
malwarebytes
malwarebytes
Evasive Shikitega Linux malware drops Monero cryptominer
2022-09-07 22:45:00
openvas
openvas
Ubuntu: Security Advisory (USN-4916-2)
2021-04-22 00:00:00
Ubuntu: Security Advisory (USN-4915-1)
2021-04-16 00:00:00
Ubuntu: Security Advisory (USN-4916-1)
2021-04-16 00:00:00
cloudfoundry
cloudfoundry
USN-4916-1: Linux kernel vulnerabilities | Cloud Foundry
2021-04-29 00:00:00
thn
thn
New Stealthy Shikitega Malware Targeting Linux Systems and IoT Devices
2022-09-07 12:38:00
GameOver(lay): Two Severe Linux Vulnerabilities Impact 40% of Ubuntu Users
2023-07-27 13:25:00

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS3

8.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

EPSS

0.008

Percentile

82.3%

JSON
Related for UB:CVE-2021-3493
githubexploit13nvd1redhatcve1cve1seebug1metasploit1debiancve1rapid7blog1attackerkb1cisa_kev1veracode1prion1cvelist1f51packetstorm1nessus4ubuntu5osv4malwarebytes1openvas4cloudfoundry1thn2