CVE-2020-25579
FreeBSD Security Advisory - FreeBSD-SA-21:01.fsdisclosure
Severity Score
5.3
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
-
*SSVC
Descriptions
In FreeBSD 12.2-STABLE before r368969, 11.4-STABLE before r369047, 12.2-RELEASE before p3, 12.1-RELEASE before p13 and 11.4-RELEASE before p7 msdosfs(5) was failing to zero-fill a pair of padding fields in the dirent structure, resulting in a leak of three uninitialized bytes.
En FreeBSD versiones 12.2-STABLE anteriores a r368969, 11.4-STABLE anteriores a r369047, 12.2-RELEASE anteriores a p3, 12.1-RELEASE anteriores a p13 y 11.4-RELEASE anteriores a p7, msdosfs(5) no lograba llenar con cero un par de campos de relleno en la estructura dirent, resultando en una pérdida de tres bytes no inicializados.
Several file systems were not properly initializing the d_off field of the dirent structures returned by VOP_READDIR. In particular, tmpfs(5), smbfs(5), autofs(5) and mqueuefs(5) were failing to do so. As a result, eight uninitialized kernel stack bytes may be leaked to userspace by these file systems. This problem is not present in FreeBSD 11. Additionally, msdosfs(5) was failing to zero-fill a pair of padding fields in the dirent structure, resulting in a leak of three uninitialized bytes. Kernel stack disclosures may leak sensitive information which could be used to compromise the security of the system.
*Credits:
N/A
CVSS Scores
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
- 2020-09-14 CVE Reserved
- 2021-01-29 CVE Published
- 2024-08-04 CVE Updated
- 2025-03-30 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-909: Missing Initialization of Resource
CAPEC
References (2)
| URL | Tag | Source |
|---|---|---|
| https://security.netapp.com/advisory/ntap-20210423-0002 | Third Party Advisory |
|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://security.FreeBSD.org/advisories/FreeBSD-SA-21:01.fsdisclosure.asc | 2022-07-12 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 11.4 Search vendor "Freebsd" for product "Freebsd" and version "11.4" | - |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 11.4 Search vendor "Freebsd" for product "Freebsd" and version "11.4" | p1 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 11.4 Search vendor "Freebsd" for product "Freebsd" and version "11.4" | p2 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 11.4 Search vendor "Freebsd" for product "Freebsd" and version "11.4" | p3 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 11.4 Search vendor "Freebsd" for product "Freebsd" and version "11.4" | p4 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 11.4 Search vendor "Freebsd" for product "Freebsd" and version "11.4" | p5 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 11.4 Search vendor "Freebsd" for product "Freebsd" and version "11.4" | p6 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1" | - |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1" | p1 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1" | p10 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1" | p11 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1" | p12 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1" | p2 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1" | p3 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1" | p4 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1" | p5 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1" | p6 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1" | p7 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1" | p8 |
Affected
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1" | p9 |
Affected
| ||||||
| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.2 Search vendor "Freebsd" for product "Freebsd" and version "12.2" | - |
Affected
| ||||||
| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.2 Search vendor "Freebsd" for product "Freebsd" and version "12.2" | p1 |
Affected
| ||||||
| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | 12.2 Search vendor "Freebsd" for product "Freebsd" and version "12.2" | p2 |
Affected
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