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.
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).
All CVE - PoC in GitHub
poc proofofconcept tester allcve cvegithub cvenew cvepoc cveupdate
None
None
None
None
None
None
None
PoC for CVE-2021-3492 used at Pwn2Own 2021
Shell Python Makefile C
My Personal Reading lists for CVE Writeups
Python
Automatic monitor github cve using Github Actions
Python
A collection of links related to Linux kernel security and exploitation
linux-kernel kernel-exploitation exploit privilege-escalation security
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]
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