CVE-2021-47132

mptcp: fix sk_forward_memory corruption on retransmission

Severity Score

"-"

*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

In the Linux kernel, the following vulnerability has been resolved:

mptcp: fix sk_forward_memory corruption on retransmission

MPTCP sk_forward_memory handling is a bit special, as such field
is protected by the msk socket spin_lock, instead of the plain
socket lock.

Currently we have a code path updating such field without handling
the relevant lock:

__mptcp_retrans() -> __mptcp_clean_una_wakeup()

Several helpers in __mptcp_clean_una_wakeup() will update
sk_forward_alloc, possibly causing such field corruption, as reported
by Matthieu.

Address the issue providing and using a new variant of blamed function
which explicitly acquires the msk spin lock.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mptcp: corrige la corrupción de sk_forward_memory en la retransmisión El manejo de MPTCP sk_forward_memory es un poco especial, ya que dicho campo está protegido por el socket msk spin_lock, en lugar del bloqueo de socket simple. Actualmente tenemos una ruta de código que actualiza dicho campo sin manejar el bloqueo relevante: __mptcp_retrans() -> __mptcp_clean_una_wakeup() Varios ayudantes en __mptcp_clean_una_wakeup() actualizarán sk_forward_alloc, posiblemente causando dicha corrupción de campo, según lo informado por Matthieu. Solucione el problema proporcionando y utilizando una nueva variante de la función culpada que adquiere explícitamente el bloqueo de giro msk.

*Credits: N/A

CVSS Scores

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-03-04 CVE Reserved
2024-03-15 CVE Published
2024-03-16 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (4)

URL	Tag	Source
https://git.kernel.org/stable/c/64b9cea7a0afe579dd2682f1f1c04f2e4e72fd25	Vuln. Introduced
https://git.kernel.org/stable/c/96db8ffef07516a6d7414b6988f2a4298a839977	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/b9c78b1a95966a7bd2ddae05b73eafc0cda4fba3	2021-06-10
https://git.kernel.org/stable/c/b5941f066b4ca331db225a976dae1d6ca8cf0ae3	2021-05-28

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.12 < 5.12.10 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.12 < 5.12.10"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.12 < 5.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.12 < 5.13"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				5.11.4 Search vendor "Linux" for product "Linux Kernel" and version "5.11.4"		en		Affected