CVE-2021-32846
HyperKit Uninitialized Memory Use and Denial of Service Vulnerability
Description
HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107, function `pci_vtsock_proc_tx` in `virtio-sock` can lead to to uninitialized memory use. In this situation, there is a check for the return value to be less or equal to `VTSOCK_MAXSEGS`, but that check is not sufficient because the function can return `-1` if it finds an error it cannot recover from. Moreover, the negative return value will be used by `iovec_pull` in a while condition that can further lead to more corruption because the function is not designed to handle a negative `iov_len`. This issue may lead to a guest crashing the host causing a denial of service and, under certain circumstance, memory corruption. This issue is fixed in commit af5eba2360a7351c08dfd9767d9be863a50ebaba.
INFO
Published Date :
Feb. 17, 2023, 11:15 p.m.
Last Modified :
June 26, 2023, 5:47 p.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
5.9
Exploitability Score :
1.8
Public PoC/Exploit Available at Github
CVE-2021-32846 has a 1 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-2021-32846.
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).
None
C JavaScript C++ HTML
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The following list is the news that have been mention
CVE-2021-32846 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-32846 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 -
Reanalysis by [email protected]
Jun. 26, 2023
Action Type Old Value New Value Removed CWE NIST CWE-908 Added CWE NIST CWE-754 -
Initial Analysis by [email protected]
Feb. 28, 2023
Action Type Old Value New Value 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://github.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebaba No Types Assigned https://github.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebaba Patch Changed Reference Type https://github.com/moby/hyperkit/pull/313 No Types Assigned https://github.com/moby/hyperkit/pull/313 Patch Changed Reference Type https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/ No Types Assigned https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/ Third Party Advisory Added CWE NIST CWE-908 Added CPE Configuration OR *cpe:2.3:a:mobyproject:hyperkit:*:*:*:*:*:*:*:* versions up to (including) 0.20210107
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-32846 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-2021-32846
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.04 }} 0.00%
score
0.13238
percentile