CVE-2020-26147

kernel: reassembling mixed encrypted/plaintext fragments

Severity Score

5.4

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in the Linux kernel 5.8.9. The WEP, WPA, WPA2, and WPA3 implementations reassemble fragments even though some of them were sent in plaintext. This vulnerability can be abused to inject packets and/or exfiltrate selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP data-confidentiality protocol is used.

Se detectó un problema en el kernel de Linux versión 5.8.9. Las implementaciones de WEP, WPA, WPA2 y WPA3 reensamblan fragmentos aunque algunos de ellos se enviaron en texto plano. Esta vulnerabilidad puede ser abusada para inyectar paquetes y/o exfiltrar fragmentos seleccionados cuando otro dispositivo envía tramas fragmentadas y el protocolo de confidencialidad de datos WEP, CCMP o GCMP es usado

A flaw was found in ieee80211_rx_h_defragment in net/mac80211/rx.c in the Linux Kernel's WiFi implementation. This vulnerability can be abused to inject packets or exfiltrate selected fragments when another device sends fragmented frames, and the WEP, CCMP, or GCMP data-confidentiality protocol is used. The highest threat from this vulnerability is to integrity.

*Credits: N/A

Attack Vector

Adjacent

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

None

Attack Vector

Adjacent

Attack Complexity

High

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-09-29 CVE Reserved
2021-05-11 CVE Published
2024-07-12 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-307: Improper Restriction of Excessive Authentication Attempts

CAPEC

References (10)

URL	Tag	Source
https://cert-portal.siemens.com/productcert/pdf/ssa-913875.pdf	Third Party Advisory
https://github.com/vanhoefm/fragattacks/blob/master/SUMMARY.md	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html	Mailing List
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html	Mailing List
https://www.arista.com/en/support/advisories-notices/security-advisories/12602-security-advisory-63	Third Party Advisory
https://www.fragattacks.com	Product

URL	Date	SRC

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2021/05/11/12	2022-07-12

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epcEWu	2022-07-12
https://access.redhat.com/security/cve/CVE-2020-26147	2021-11-09
https://bugzilla.redhat.com/show_bug.cgi?id=1960504	2021-11-09

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Arista Search vendor "Arista"	C-75 Firmware Search vendor "Arista" for product "C-75 Firmware"	-	-	Affected	in	Arista Search vendor "Arista"	C-75 Search vendor "Arista" for product "C-75"	-	-	Safe
Arista Search vendor "Arista"	O-90 Firmware Search vendor "Arista" for product "O-90 Firmware"	-	-	Affected	in	Arista Search vendor "Arista"	O-90 Search vendor "Arista" for product "O-90"	-	-	Safe
Arista Search vendor "Arista"	C-65 Firmware Search vendor "Arista" for product "C-65 Firmware"	-	-	Affected	in	Arista Search vendor "Arista"	C-65 Search vendor "Arista" for product "C-65"	-	-	Safe
Arista Search vendor "Arista"	W-68 Firmware Search vendor "Arista" for product "W-68 Firmware"	-	-	Affected	in	Arista Search vendor "Arista"	W-68 Search vendor "Arista" for product "W-68"	-	-	Safe
Siemens Search vendor "Siemens"	Scalance W700 Ieee 802.11n Firmware Search vendor "Siemens" for product "Scalance W700 Ieee 802.11n Firmware"	*	-	Affected	in	Siemens Search vendor "Siemens"	Scalance W700 Ieee 802.11n Search vendor "Siemens" for product "Scalance W700 Ieee 802.11n"	-	-	Safe
Siemens Search vendor "Siemens"	Scalance W1700 Ieee 802.11ac Firmware Search vendor "Siemens" for product "Scalance W1700 Ieee 802.11ac Firmware"	*	-	Affected	in	Siemens Search vendor "Siemens"	Scalance W1700 Ieee 802.11ac Search vendor "Siemens" for product "Scalance W1700 Ieee 802.11ac"	-	-	Safe
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.4 < 4.4.271 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.4 < 4.4.271"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.9 < 4.9.271 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9 < 4.9.271"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.14 < 4.14.235 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14 < 4.14.235"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.19 < 4.19.193 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.19 < 4.19.193"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.4 < 5.4.124 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.4 < 5.4.124"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.10 < 5.10.42 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.10 < 5.10.42"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.12 < 5.12.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.12 < 5.12.9"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected