CVE-2021-38578
edk2: integer underflow in SmmEntryPoint function leads to potential SMM privilege escalation
Severity Score
9.8
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
-
*SSVC
Descriptions
Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.
Unas comprobaciones existentes de CommBuffer en SmmEntryPoint no detectan el desbordamiento cuando es calculado BufferSize
A flaw was found in edk2. A integer underflow in the SmmEntryPoint function leads to a write into the SMM region allowing a local attacker with administration privileges on the system to execute code within the SMM privileged context. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:-
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2021-08-11 CVE Reserved
- 2022-03-03 CVE Published
- 2024-08-06 CVE Updated
- 2024-11-16 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-124: Buffer Underwrite ('Buffer Underflow')
- CWE-787: Out-of-bounds Write
CAPEC
References (4)
| URL | Tag | Source |
|---|---|---|
| https://www.insyde.com/security-pledge/SA-2023024 | Third Party Advisory |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://bugzilla.tianocore.org/show_bug.cgi?id=3387 | 2023-08-02 | |
| https://access.redhat.com/security/cve/CVE-2021-38578 | 2023-05-09 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1960321 | 2023-05-09 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Tianocore Search vendor "Tianocore" | Edk2 Search vendor "Tianocore" for product "Edk2" | <= 202202 Search vendor "Tianocore" for product "Edk2" and version " <= 202202" | - |
Affected
| ||||||
| Insyde Search vendor "Insyde" | Kernel Search vendor "Insyde" for product "Kernel" | 5.0 Search vendor "Insyde" for product "Kernel" and version "5.0" | - |
Affected
| ||||||
| Insyde Search vendor "Insyde" | Kernel Search vendor "Insyde" for product "Kernel" | 5.1 Search vendor "Insyde" for product "Kernel" and version "5.1" | - |
Affected
| ||||||
| Insyde Search vendor "Insyde" | Kernel Search vendor "Insyde" for product "Kernel" | 5.2 Search vendor "Insyde" for product "Kernel" and version "5.2" | - |
Affected
| ||||||
| Insyde Search vendor "Insyde" | Kernel Search vendor "Insyde" for product "Kernel" | 5.3 Search vendor "Insyde" for product "Kernel" and version "5.3" | - |
Affected
| ||||||
| Insyde Search vendor "Insyde" | Kernel Search vendor "Insyde" for product "Kernel" | 5.4 Search vendor "Insyde" for product "Kernel" and version "5.4" | - |
Affected
| ||||||
| Insyde Search vendor "Insyde" | Kernel Search vendor "Insyde" for product "Kernel" | 5.5 Search vendor "Insyde" for product "Kernel" and version "5.5" | - |
Affected
| ||||||