CVE-2021-47591

mptcp: remove tcp ulp setsockopt support

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: remove tcp ulp setsockopt support

TCP_ULP setsockopt cannot be used for mptcp because its already
used internally to plumb subflow (tcp) sockets to the mptcp layer.

syzbot managed to trigger a crash for mptcp connections that are
in fallback mode:

KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 1 PID: 1083 Comm: syz-executor.3 Not tainted 5.16.0-rc2-syzkaller #0
RIP: 0010:tls_build_proto net/tls/tls_main.c:776 [inline]
[..]
__tcp_set_ulp net/ipv4/tcp_ulp.c:139 [inline]
tcp_set_ulp+0x428/0x4c0 net/ipv4/tcp_ulp.c:160
do_tcp_setsockopt+0x455/0x37c0 net/ipv4/tcp.c:3391
mptcp_setsockopt+0x1b47/0x2400 net/mptcp/sockopt.c:638

Remove support for TCP_ULP setsockopt.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: mptcp: elimina el soporte de tcp ulp setsockopt TCP_ULP setsockopt no se puede usar para mptcp porque ya se usa internamente para conectar sockets de subflujo (tcp) a la capa mptcp. syzbot logró desencadenar un bloqueo para las conexiones mptcp que están en modo alternativo: KASAN: null-ptr-deref en el rango [0x0000000000000020-0x0000000000000027] CPU: 1 PID: 1083 Comm: syz-executor.3 Not tainted 5.16.0-rc2- syzkaller #0 RIP: 0010:tls_build_proto net/tls/tls_main.c:776 [en línea] [..] __tcp_set_ulp net/ipv4/tcp_ulp.c:139 [en línea] tcp_set_ulp+0x428/0x4c0 net/ipv4/tcp_ulp.c: 160 do_tcp_setsockopt+0x455/0x37c0 net/ipv4/tcp.c:3391 mptcp_setsockopt+0x1b47/0x2400 net/mptcp/sockopt.c:638 Elimina la compatibilidad con TCP_ULP setsockopt.

*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

2024-05-24 CVE Reserved
2024-06-19 CVE Published
2024-06-20 EPSS Updated
2024-11-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (3)

URL	Tag	Source
https://git.kernel.org/stable/c/d9e4c129181004ec94b315b0c9db5eeb09da75e6	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/3de0c86d42f841d1d64f316cd949e65c566f0734	2021-12-22
https://git.kernel.org/stable/c/404cd9a22150f24acf23a8df2ad0c094ba379f57	2021-12-15

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"				>= 5.13 < 5.15.11 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.13 < 5.15.11"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.13 < 5.16 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.13 < 5.16"		en		Affected