CVE-2024-35900

netfilter: nf_tables: reject new basechain after table flag update

Severity Score

5.5

*CVSS v3.1

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:

netfilter: nf_tables: reject new basechain after table flag update

When dormant flag is toggled, hooks are disabled in the commit phase by
iterating over current chains in table (existing and new).

The following configuration allows for an inconsistent state:

add table x
add chain x y { type filter hook input priority 0; }
add table x { flags dormant; }
add chain x w { type filter hook input priority 1; }

which triggers the following warning when trying to unregister chain w
which is already unregistered.

[ 127.322252] WARNING: CPU: 7 PID: 1211 at net/netfilter/core.c:50 1 __nf_unregister_net_hook+0x21a/0x260
[...]
[ 127.322519] Call Trace:
[ 127.322521] <TASK>
[ 127.322524] ? __warn+0x9f/0x1a0
[ 127.322531] ? __nf_unregister_net_hook+0x21a/0x260
[ 127.322537] ? report_bug+0x1b1/0x1e0
[ 127.322545] ? handle_bug+0x3c/0x70
[ 127.322552] ? exc_invalid_op+0x17/0x40
[ 127.322556] ? asm_exc_invalid_op+0x1a/0x20
[ 127.322563] ? kasan_save_free_info+0x3b/0x60
[ 127.322570] ? __nf_unregister_net_hook+0x6a/0x260
[ 127.322577] ? __nf_unregister_net_hook+0x21a/0x260
[ 127.322583] ? __nf_unregister_net_hook+0x6a/0x260
[ 127.322590] ? __nf_tables_unregister_hook+0x8a/0xe0 [nf_tables]
[ 127.322655] nft_table_disable+0x75/0xf0 [nf_tables]
[ 127.322717] nf_tables_commit+0x2571/0x2620 [nf_tables]

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: netfilter: nf_tables: rechazar nueva cadena base después de actualizar la bandera de la tabla Cuando se activa la bandera inactiva, los enlaces se desactivan en la fase de confirmación al iterar sobre las cadenas actuales en la tabla (existentes y nuevas). La siguiente configuración permite un estado inconsistente: agregar tabla x agregar cadena xy { tipo filtro gancho entrada prioridad 0; } agregar tabla x {banderas inactivas; } agregar cadena xw {tipo filtro gancho entrada prioridad 1; } que activa la siguiente advertencia al intentar cancelar el registro de la cadena w que ya está cancelada. [127.322252] ADVERTENCIA: CPU: 7 PID: 1211 en net/netfilter/core.c:50 1 __nf_unregister_net_hook+0x21a/0x260 [...] [ 127.322519] Seguimiento de llamadas: [ 127.322521] [ 127.322524] ? __advertir+0x9f/0x1a0 [ 127.322531] ? __nf_unregister_net_hook+0x21a/0x260 [127.322537]? report_bug+0x1b1/0x1e0 [127.322545]? handle_bug+0x3c/0x70 [127.322552]? exc_invalid_op+0x17/0x40 [127.322556]? asm_exc_invalid_op+0x1a/0x20 [127.322563]? kasan_save_free_info+0x3b/0x60 [127.322570]? __nf_unregister_net_hook+0x6a/0x260 [127.322577]? __nf_unregister_net_hook+0x21a/0x260 [127.322583]? __nf_unregister_net_hook+0x6a/0x260 [127.322590]? __nf_tables_unregister_hook+0x8a/0xe0 [nf_tables] [ 127.322655] nft_table_disable+0x75/0xf0 [nf_tables] [ 127.322717] nf_tables_commit+0x2571/0x2620 [nf_tables]

*Credits: N/A

CVSS Scores

Red Hatv3.1 5.5

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-05-17 CVE Reserved
2024-05-19 CVE Published
2024-05-20 EPSS Updated
2024-09-11 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (14)

URL	Tag	Source
https://git.kernel.org/stable/c/e10f661adc556c4969c70ddaddf238bffdaf1e87	Vuln. Introduced
https://git.kernel.org/stable/c/d9c4da8cb74e8ee6e58a064a3573aa37acf6c935	Vuln. Introduced
https://git.kernel.org/stable/c/179d9ba5559a756f4322583388b3213fe4e391b0	Vuln. Introduced
https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/41bad13c0e8a5a2b47a7472cced922555372daab	2024-04-13
https://git.kernel.org/stable/c/7b6fba6918714afee3e17796113ccab636255c7b	2024-04-13
https://git.kernel.org/stable/c/8ba81dca416adf82fc5a2a23abc1a8cc02ad32fb	2024-04-10
https://git.kernel.org/stable/c/745cf6a843896cdac8766c74379300ed73c78830	2024-04-10
https://git.kernel.org/stable/c/420132bee3d0136b7fba253a597b098fe15493a7	2024-04-10
https://git.kernel.org/stable/c/e95bb4cba94c018be24b11f017d1c55dd6cda31a	2024-04-10
https://git.kernel.org/stable/c/994209ddf4f430946f6247616b2e33d179243769	2024-04-04
https://git.kernel.org/stable/c/6d12f21f8bbe23fde25b77c2bf5973c136b8bef8	2024-06-16

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2024-35900	2024-08-08
https://bugzilla.redhat.com/show_bug.cgi?id=2281664	2024-08-08

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"				>= 5.4.262 < 5.4.274 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.4.262 < 5.4.274"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.10.202 < 5.10.215 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.10.202 < 5.10.215"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.13 < 5.15.154 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.13 < 5.15.154"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.13 < 6.1.85 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.13 < 6.1.85"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.13 < 6.6.26 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.13 < 6.6.26"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.13 < 6.8.5 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.13 < 6.8.5"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.13 < 6.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.13 < 6.9"		en		Affected