8.8
HIGH
CVE-2021-3492
Ubuntu Linux Shiftfs Double-Free Memory Corruption
Description

Shiftfs, an out-of-tree stacking file system included in Ubuntu Linux kernels, did not properly handle faults occurring during copy_from_user() correctly. These could lead to either a double-free situation or memory not being freed at all. An attacker could use this to cause a denial of service (kernel memory exhaustion) or gain privileges via executing arbitrary code. AKA ZDI-CAN-13562.

INFO

Published Date :

April 17, 2021, 5:15 a.m.

Last Modified :

May 21, 2021, 4:08 p.m.

Source :

[email protected]

Remotely Exploitable :

No

Impact Score :

6.0

Exploitability Score :

2.0
Public PoC/Exploit Available at Github

CVE-2021-3492 has a 12 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2021-3492 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Canonical ubuntu_linux
: Total Affected Vendor : 1 | Products : 1
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-3492.

URL Resource
http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077-1.html Third Party Advisory VDB Entry
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=25c891a949bf918b59cbc6e4932015ba4c35c333 Mailing List Patch Vendor Advisory
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=8fee52ab9da87d82bc6de9ebb3480fff9b4d53e6 Mailing List Patch Vendor Advisory
https://ubuntu.com/security/notices/USN-4917-1 Vendor Advisory
https://www.openwall.com/lists/oss-security/2021/04/16/2 Mailing List Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-422/ Third Party Advisory VDB Entry

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
NaInSec/CVE-PoC-in-GitHub

All CVE - PoC in GitHub

poc proofofconcept tester allcve cvegithub cvenew cvepoc cveupdate

Updated: 1 month, 1 week ago
5 stars 2 fork 2 watcher
Born at : March 22, 2024, 3:58 p.m. This repo has been linked 928 different CVEs too.
Profile Photo
zecool/cve

None

Updated: 6 months, 3 weeks ago
1 stars 0 fork 0 watcher
Born at : March 11, 2024, 1:21 p.m. This repo has been linked 930 different CVEs too.
Profile Photo
whoforget/CVE-POC

None

Updated: 1 year, 6 months ago
0 stars 2 fork 2 watcher
Born at : April 8, 2023, 6:19 a.m. This repo has been linked 923 different CVEs too.
Profile Photo
ndk06/linux-kernel-exploitation

None

Updated: 1 month, 1 week ago
6 stars 0 fork 0 watcher
Born at : Feb. 25, 2023, 10:40 a.m. This repo has been linked 178 different CVEs too.
Profile Photo
k0mi-tg/CVE-POC

None

Updated: 7 months, 3 weeks ago
20 stars 3 fork 3 watcher
Born at : Feb. 14, 2023, 6:10 p.m. This repo has been linked 921 different CVEs too.
Profile Photo
WhooAmii/POC_to_review

None

Updated: 7 months, 2 weeks ago
2 stars 2 fork 2 watcher
Born at : Nov. 25, 2022, 5:43 p.m. This repo has been linked 930 different CVEs too.
Profile Photo
soosmile/POC

None

Updated: 3 months ago
8 stars 1 fork 1 watcher
Born at : June 21, 2022, 7:45 a.m. This repo has been linked 943 different CVEs too.
Profile Photo
hac425xxx/heap-exploitation-in-real-world

None

Updated: 1 month, 3 weeks ago
281 stars 31 fork 31 watcher
Born at : Oct. 6, 2021, 6:39 a.m. This repo has been linked 13 different CVEs too.
Profile Photo
synacktiv/CVE-2021-3492

PoC for CVE-2021-3492 used at Pwn2Own 2021

Shell Python Makefile C

Updated: 1 month, 2 weeks ago
40 stars 6 fork 6 watcher
Born at : June 28, 2021, 9:43 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
joydo/CVE-Writeups

My Personal Reading lists for CVE Writeups

Python

Updated: 2 months, 1 week ago
30 stars 5 fork 5 watcher
Born at : April 15, 2021, 1:15 a.m. This repo has been linked 30 different CVEs too.
Profile Photo
n0-traces/cve_monitor

Automatic monitor github cve using Github Actions

Python

Updated: 2 weeks ago
1 stars 56 fork 56 watcher
Born at : April 7, 2021, 11:16 a.m. This repo has been linked 1007 different CVEs too.
Profile Photo
xairy/linux-kernel-exploitation

A collection of links related to Linux kernel security and exploitation

linux-kernel kernel-exploitation exploit privilege-escalation security

Updated: 3 weeks, 4 days ago
5527 stars 902 fork 902 watcher
Born at : Nov. 13, 2016, 10:21 p.m. This repo has been linked 225 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-3492 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-3492 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Modified Analysis by [email protected]

    May. 21, 2021

    Action Type Old Value New Value
    Changed Reference Type http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077-1.html No Types Assigned http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077-1.html Third Party Advisory, VDB Entry
  • CVE Modified by [email protected]

    May. 18, 2021

    Action Type Old Value New Value
    Added Reference http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077-1.html [No Types Assigned]
  • Initial Analysis by [email protected]

    Apr. 22, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:C/I:C/A:C)
    Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=25c891a949bf918b59cbc6e4932015ba4c35c333 No Types Assigned https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=25c891a949bf918b59cbc6e4932015ba4c35c333 Mailing List, Patch, Vendor Advisory
    Changed Reference Type https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=8fee52ab9da87d82bc6de9ebb3480fff9b4d53e6 No Types Assigned https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=8fee52ab9da87d82bc6de9ebb3480fff9b4d53e6 Mailing List, Patch, Vendor Advisory
    Changed Reference Type https://ubuntu.com/security/notices/USN-4917-1 No Types Assigned https://ubuntu.com/security/notices/USN-4917-1 Vendor Advisory
    Changed Reference Type https://www.openwall.com/lists/oss-security/2021/04/16/2 No Types Assigned https://www.openwall.com/lists/oss-security/2021/04/16/2 Mailing List, Third Party Advisory
    Changed Reference Type https://www.zerodayinitiative.com/advisories/ZDI-21-422/ No Types Assigned https://www.zerodayinitiative.com/advisories/ZDI-21-422/ Third Party Advisory, VDB Entry
    Added CWE NIST CWE-401
    Added CWE NIST CWE-415
    Added CPE Configuration OR *cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:lts:*:*:* versions up to (excluding) 18.04 *cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:lts:*:*:* versions from (including) 18.04.1 up to (excluding) 20.04
    Added CPE Configuration OR *cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:-:*:*:* versions up to (excluding) 20.10
  • CVE Modified by [email protected]

    Apr. 21, 2021

    Action Type Old Value New Value
    Added Reference https://www.zerodayinitiative.com/advisories/ZDI-21-422/ [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-3492 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-3492 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.05 }} 0.00%

score

0.14955

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: