CVE-2021-33626
Intel SMM Unvalidated Pointer Vulnerability
Description
A vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated buffer pointer(QWORD values for CommBuffer). This can be used by an attacker to corrupt data in SMRAM memory and even lead to arbitrary code execution.
INFO
Published Date :
Oct. 1, 2021, 3:15 a.m.
Last Modified :
April 24, 2022, 2:03 a.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
5.9
Exploitability Score :
1.8
Affected Products
The following products are affected by CVE-2021-33626
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.
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-2021-33626.
| URL | Resource |
|---|---|
| https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf | Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20220216-0006/ | Third Party Advisory |
| https://www.insyde.com/security-pledge | Vendor Advisory |
| https://www.insyde.com/security-pledge/SA-2021001 | Vendor Advisory |
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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-33626 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-33626 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]
Apr. 24, 2022
Action Type Old Value New Value Changed Reference Type https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf No Types Assigned https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf Third Party Advisory Changed Reference Type https://security.netapp.com/advisory/ntap-20220216-0006/ No Types Assigned https://security.netapp.com/advisory/ntap-20220216-0006/ Third Party Advisory Changed Reference Type https://www.insyde.com/security-pledge No Types Assigned https://www.insyde.com/security-pledge Vendor Advisory Added CPE Configuration AND OR *cpe:2.3:o:siemens:ruggedcom_apr1808_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:ruggedcom_apr1808:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_field_pg_m5_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_field_pg_m5:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_field_pg_m6_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_field_pg_m6:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_ipc127e_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_ipc127e:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_ipc227g_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_ipc227g:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_ipc277g_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_ipc277g:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_ipc327g_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_ipc327g:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_ipc377g_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_ipc377g:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_ipc427e_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_ipc427e:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_ipc477e_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_ipc477e:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_ipc477e_pro_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_ipc477e_pro:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_ipc627e_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_ipc627e:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_ipc647e_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_ipc647e:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_ipc677e_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_ipc677e:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_ipc847e_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_ipc847e:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_itp1000_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_itp1000:-:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Feb. 24, 2022
Action Type Old Value New Value Added Reference https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf [No Types Assigned] -
CVE Modified by [email protected]
Feb. 17, 2022
Action Type Old Value New Value Added Reference https://security.netapp.com/advisory/ntap-20220216-0006/ [No Types Assigned] -
CVE Modified by [email protected]
Feb. 03, 2022
Action Type Old Value New Value Changed Description In the kernel in Insyde InsydeH2O 5.x, certain SMM drivers did not correctly validate the CommBuffer and CommBufferSize parameters, allowing callers to corrupt either the firmware or the OS memory. The fixed versions for this issue in the PnpSmm, SmmResourceCheckDxe, and BeepStatusCode drivers are 05.08.23, 05.16.23, 05.26.23, 05.35.23, 05.43.23, and 05.51.23 (for Kernel 5.0 through 5.5). A vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated buffer pointer(QWORD values for CommBuffer). This can be used by an attacker to corrupt data in SMRAM memory and even lead to arbitrary code execution. Added Reference https://www.insyde.com/security-pledge [No Types Assigned] -
Initial Analysis by [email protected]
Oct. 15, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:P/I:P/A:P) 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://www.insyde.com/security-pledge/SA-2021001 No Types Assigned https://www.insyde.com/security-pledge/SA-2021001 Vendor Advisory Added CWE NIST CWE-829 Added CPE Configuration OR *cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:* versions from (including) 5.3 up to (excluding) 5.34.44 Added CPE Configuration OR *cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:* versions from (including) 5.2 up to (excluding) 5.25.44 Added CPE Configuration OR *cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:* versions from (including) 5.1 up to (excluding) 5.16.25 Added CPE Configuration OR *cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:* versions from (including) 5.4 up to (excluding) 5.42.44 Added CPE Configuration OR *cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:* versions from (including) 5.3 up to (excluding) 5.35.25 Added CPE Configuration OR *cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:* versions from (including) 5.2 up to (excluding) 5.26.25 Added CPE Configuration OR *cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:* versions from (including) 5.4 up to (excluding) 5.43.25
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-33626 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-2021-33626
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.05 }} 0.01%
score
0.18244
percentile