CVE-2021-47576

scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select()

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:

scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select()

In resp_mode_select() sanity check the block descriptor len to avoid UAF.

BUG: KASAN: use-after-free in resp_mode_select+0xa4c/0xb40 drivers/scsi/scsi_debug.c:2509
Read of size 1 at addr ffff888026670f50 by task scsicmd/15032

CPU: 1 PID: 15032 Comm: scsicmd Not tainted 5.15.0-01d0625 #15
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
Call Trace:
<TASK>
dump_stack_lvl+0x89/0xb5 lib/dump_stack.c:107
print_address_description.constprop.9+0x28/0x160 mm/kasan/report.c:257
kasan_report.cold.14+0x7d/0x117 mm/kasan/report.c:443
__asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306
resp_mode_select+0xa4c/0xb40 drivers/scsi/scsi_debug.c:2509
schedule_resp+0x4af/0x1a10 drivers/scsi/scsi_debug.c:5483
scsi_debug_queuecommand+0x8c9/0x1e70 drivers/scsi/scsi_debug.c:7537
scsi_queue_rq+0x16b4/0x2d10 drivers/scsi/scsi_lib.c:1521
blk_mq_dispatch_rq_list+0xb9b/0x2700 block/blk-mq.c:1640
__blk_mq_sched_dispatch_requests+0x28f/0x590 block/blk-mq-sched.c:325
blk_mq_sched_dispatch_requests+0x105/0x190 block/blk-mq-sched.c:358
__blk_mq_run_hw_queue+0xe5/0x150 block/blk-mq.c:1762
__blk_mq_delay_run_hw_queue+0x4f8/0x5c0 block/blk-mq.c:1839
blk_mq_run_hw_queue+0x18d/0x350 block/blk-mq.c:1891
blk_mq_sched_insert_request+0x3db/0x4e0 block/blk-mq-sched.c:474
blk_execute_rq_nowait+0x16b/0x1c0 block/blk-exec.c:63
sg_common_write.isra.18+0xeb3/0x2000 drivers/scsi/sg.c:837
sg_new_write.isra.19+0x570/0x8c0 drivers/scsi/sg.c:775
sg_ioctl_common+0x14d6/0x2710 drivers/scsi/sg.c:941
sg_ioctl+0xa2/0x180 drivers/scsi/sg.c:1166
__x64_sys_ioctl+0x19d/0x220 fs/ioctl.c:52
do_syscall_64+0x3a/0x80 arch/x86/entry/common.c:50
entry_SYSCALL_64_after_hwframe+0x44/0xae arch/x86/entry/entry_64.S:113

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: scsi: scsi_debug: Verifique la longitud del descriptor del bloque en resp_mode_select() En resp_mode_select(), verifique la longitud del descriptor del bloque para evitar UAF. ERROR: KASAN: use-after-free en resp_mode_select+0xa4c/0xb40 drivers/scsi/scsi_debug.c:2509 Lectura del tamaño 1 en la dirección ffff888026670f50 por tarea scsicmd/15032 CPU: 1 PID: 15032 Comm: scsicmd Not tainted 5.15.0 -01d0625 #15 Nombre del hardware: PC estándar QEMU (i440FX + PIIX, 1996), seguimiento de llamadas del BIOS: dump_stack_lvl+0x89/0xb5 lib/dump_stack.c:107 print_address_description.constprop.9+0x28/0x160 mm/kasan/ report.c:257 kasan_report.cold.14+0x7d/0x117 mm/kasan/report.c:443 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 resp_mode_select+0xa4c/0xb40 drivers/scsi/scsi_debug.c: 2509 Schedule_resp+0x4af/0x1a10 controladores/scsi/scsi_debug.c:5483 scsi_debug_queuecommand+0x8c9/0x1e70 controladores/scsi/scsi_debug.c:7537 scsi_queue_rq+0x16b4/0x2d10 controladores/scsi/scsi_lib.c:1521 blk_mq_dispatch_rq_list+0xb9b/0x2700 bloque/ blk-mq.c:1640 __blk_mq_sched_dispatch_requests+0x28f/0x590 block/blk-mq-sched.c:325 blk_mq_sched_dispatch_requests+0x105/0x190 block/blk-mq-sched.c:358 __blk_mq_run_hw_queue+0xe5/ 0x150 cuadra/blk-mq. c:1762 __blk_mq_delay_run_hw_queue+0x4f8/0x5c0 block/blk-mq.c:1839 blk_mq_run_hw_queue+0x18d/0x350 block/blk-mq.c:1891 blk_mq_sched_insert_request+0x3db/0x4e0 ched.c:474 blk_execute_rq_nowait+0x16b /0x1c0 block/blk-exec.c:63 sg_common_write.isra.18+0xeb3/0x2000 controladores/scsi/sg.c:837 sg_new_write.isra.19+0x570/0x8c0 controladores/scsi/sg.c:775 sg_ioctl_common+0x14d6 /0x2710 controladores/scsi/sg.c:941 sg_ioctl+0xa2/0x180 controladores/scsi/sg.c:1166 __x64_sys_ioctl+0x19d/0x220 fs/ioctl.c:52 do_syscall_64+0x3a/0x80 arch/x86/entry/common. c:50 entrada_SYSCALL_64_after_hwframe+0x44/0xae arch/x86/entry/entry_64.S:113

*Credits: N/A

CVSS Scores

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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
2024-08-28 EPSS Updated
2024-11-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (7)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/adcecd50da6cab7b4957cba0606771dcc846c5a9	2021-12-22
https://git.kernel.org/stable/c/90491283b4064220682e4b0687d07b05df01e3bf	2021-12-22
https://git.kernel.org/stable/c/04181973c38f3d6a353f9246dcf7fee08024fd9e	2021-12-22
https://git.kernel.org/stable/c/b847ecff850719c46c95acd25a0d555dfd16e10d	2021-12-22
https://git.kernel.org/stable/c/a9078e791426c2cbbdf28a320c3670f6e0a611e6	2021-12-22
https://git.kernel.org/stable/c/dfc3fff63793c571147930b13c0f8c689c4281ac	2021-12-22
https://git.kernel.org/stable/c/e0a2c28da11e2c2b963fc01d50acbf03045ac732	2021-11-23

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"				< 4.9.294 Search vendor "Linux" for product "Linux Kernel" and version " < 4.9.294"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.14.259 Search vendor "Linux" for product "Linux Kernel" and version " < 4.14.259"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.19.222 Search vendor "Linux" for product "Linux Kernel" and version " < 4.19.222"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.4.168 Search vendor "Linux" for product "Linux Kernel" and version " < 5.4.168"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.10.88 Search vendor "Linux" for product "Linux Kernel" and version " < 5.10.88"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.15.11 Search vendor "Linux" for product "Linux Kernel" and version " < 5.15.11"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.16 Search vendor "Linux" for product "Linux Kernel" and version " < 5.16"		en		Affected