CVE-2021-47580

scsi: scsi_debug: Fix type in min_t to avoid stack OOB

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: Fix type in min_t to avoid stack OOB

Change min_t() to use type "u32" instead of type "int" to avoid stack out
of bounds. With min_t() type "int" the values get sign extended and the
larger value gets used causing stack out of bounds.

BUG: KASAN: stack-out-of-bounds in memcpy include/linux/fortify-string.h:191 [inline]
BUG: KASAN: stack-out-of-bounds in sg_copy_buffer+0x1de/0x240 lib/scatterlist.c:976
Read of size 127 at addr ffff888072607128 by task syz-executor.7/18707

CPU: 1 PID: 18707 Comm: syz-executor.7 Not tainted 5.15.0-syzk #1
Hardware name: Red Hat KVM, BIOS 1.13.0-2
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x89/0xb5 lib/dump_stack.c:106
print_address_description.constprop.9+0x28/0x160 mm/kasan/report.c:256
__kasan_report mm/kasan/report.c:442 [inline]
kasan_report.cold.14+0x7d/0x117 mm/kasan/report.c:459
check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0x1a3/0x210 mm/kasan/generic.c:189
memcpy+0x23/0x60 mm/kasan/shadow.c:65
memcpy include/linux/fortify-string.h:191 [inline]
sg_copy_buffer+0x1de/0x240 lib/scatterlist.c:976
sg_copy_from_buffer+0x33/0x40 lib/scatterlist.c:1000
fill_from_dev_buffer.part.34+0x82/0x130 drivers/scsi/scsi_debug.c:1162
fill_from_dev_buffer drivers/scsi/scsi_debug.c:1888 [inline]
resp_readcap16+0x365/0x3b0 drivers/scsi/scsi_debug.c:1887
schedule_resp+0x4d8/0x1a70 drivers/scsi/scsi_debug.c:5478
scsi_debug_queuecommand+0x8c9/0x1ec0 drivers/scsi/scsi_debug.c:7533
scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1520 [inline]
scsi_queue_rq+0x16b0/0x2d40 drivers/scsi/scsi_lib.c:1699
blk_mq_dispatch_rq_list+0xb9b/0x2700 block/blk-mq.c:1639
__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:1761
__blk_mq_delay_run_hw_queue+0x4f8/0x5c0 block/blk-mq.c:1838
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:62
sg_common_write.isra.18+0xeb3/0x2000 drivers/scsi/sg.c:836
sg_new_write.isra.19+0x570/0x8c0 drivers/scsi/sg.c:774
sg_ioctl_common+0x14d6/0x2710 drivers/scsi/sg.c:939
sg_ioctl+0xa2/0x180 drivers/scsi/sg.c:1165
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x19d/0x220 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3a/0x80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: scsi: scsi_debug: corrige el tipo min_t para evitar la pila OOB. Cambie min_t() para usar el tipo "u32" en lugar de "int" para evitar la pila fuera de los límites. Con min_t() escriba "int", los valores se extienden y el valor mayor se usa provocando que la pila esté fuera de los límites. ERROR: KASAN: pila fuera de los límites en memcpy include/linux/fortify-string.h:191 [en línea] ERROR: KASAN: pila fuera de los límites en sg_copy_buffer+0x1de/0x240 lib/scatterlist.c: 976 Lectura del tamaño 127 en la dirección ffff888072607128 mediante la tarea syz-executor.7/18707 CPU: 1 PID: 18707 Comm: syz-executor.7 No contaminado 5.15.0-syzk #1 Nombre del hardware: Red Hat KVM, BIOS 1.13.0 -2 Seguimiento de llamadas: __dump_stack lib/dump_stack.c:88 [en línea] dump_stack_lvl+0x89/0xb5 lib/dump_stack.c:106 print_address_description.constprop.9+0x28/0x160 mm/kasan/report.c:256 __kasan_report mm/kasan /report.c:442 [en línea] kasan_report.cold.14+0x7d/0x117 mm/kasan/report.c:459 check_region_inline mm/kasan/generic.c:183 [en línea] kasan_check_range+0x1a3/0x210 mm/kasan/generic .c:189 memcpy+0x23/0x60 mm/kasan/shadow.c:65 memcpy include/linux/fortify-string.h:191 [en línea] sg_copy_buffer+0x1de/0x240 lib/scatterlist.c:976 sg_copy_from_buffer+0x33/0x40 lib/scatterlist.c:1000 fill_from_dev_buffer.part.34+0x82/0x130 controladores/scsi/scsi_debug.c:1162 fill_from_dev_buffer controladores/scsi/scsi_debug.c:1888 [en línea] resp_readcap16+0x365/0x3b0 controladores/scsi/scsi_debug.c :1887 Schedule_resp+0x4d8/0x1a70 controladores/scsi/scsi_debug.c:5478 scsi_debug_queuecommand+0x8c9/0x1ec0 controladores/scsi/scsi_debug.c:7533 controladores scsi_dispatch_cmd/scsi/scsi_lib.c:1520 [en línea] Controladores 0x16b0/0x2d40/ scsi/scsi_lib.c:1699 blk_mq_dispatch_rq_list+0xb9b/0x2700 block/blk-mq.c:1639 __blk_mq_sched_dispatch_requests+0x28f/0x590 block/blk-mq-sched.c:325 blk_mq_sched_dispatch_requests+0x10 5/0x190 cuadra/blk-mq-programado. c:358 __blk_mq_run_hw_queue+0xe5/0x150 block/blk-mq.c:1761 __blk_mq_delay_run_hw_queue+0x4f8/0x5c0 block/blk-mq.c:1838 blk_mq_run_hw_queue+0x18d/0x350 :1891 blk_mq_sched_insert_request+0x3db/0x4e0 block/blk-mq-sched.c:474 blk_execute_rq_nowait+0x16b/0x1c0 block/blk-exec.c:62 sg_common_write.isra.18+0xeb3/0x2000 drivers/scsi/sg.c:836 sg_new_write.isra.19+0x570 /0x8c0 controladores/scsi/sg.c:774 sg_ioctl_common+0x14d6/0x2710 controladores/scsi/sg.c:939 sg_ioctl+0xa2/0x180 controladores/scsi/sg.c:1165 vfs_ioctl fs/ioctl.c:51 [en línea] __do_sys_ioctl fs/ioctl.c:874 [en línea] __se_sys_ioctl fs/ioctl.c:860 [en línea] __x64_sys_ioctl+0x19d/0x220 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [en línea] llamada al sistema_64 +0x3a/0x80 arch/x86/entry/common.c:80 Entry_SYSCALL_64_after_hwframe+0x44/0xae

*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
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/bdb854f134b964528fa543e0351022eb45bd7346	2021-12-22
https://git.kernel.org/stable/c/3085147645938eb41f0bc0e25ef9791e71f5ee4b	2021-12-22
https://git.kernel.org/stable/c/36e07d7ede88a1f1ef8f0f209af5b7612324ac2c	2021-11-19

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"				< 5.10.88 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