CVE-2021-47097
Input: elantech - fix stack out of bound access in elantech_change_report_id()
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
Input: elantech - fix stack out of bound access in elantech_change_report_id()
The array param[] in elantech_change_report_id() must be at least 3
bytes, because elantech_read_reg_params() is calling ps2_command() with
PSMOUSE_CMD_GETINFO, that is going to access 3 bytes from param[], but
it's defined in the stack as an array of 2 bytes, therefore we have a
potential stack out-of-bounds access here, also confirmed by KASAN:
[ 6.512374] BUG: KASAN: stack-out-of-bounds in __ps2_command+0x372/0x7e0
[ 6.512397] Read of size 1 at addr ffff8881024d77c2 by task kworker/2:1/118
[ 6.512416] CPU: 2 PID: 118 Comm: kworker/2:1 Not tainted 5.13.0-22-generic #22+arighi20211110
[ 6.512428] Hardware name: LENOVO 20T8000QGE/20T8000QGE, BIOS R1AET32W (1.08 ) 08/14/2020
[ 6.512436] Workqueue: events_long serio_handle_event
[ 6.512453] Call Trace:
[ 6.512462] show_stack+0x52/0x58
[ 6.512474] dump_stack+0xa1/0xd3
[ 6.512487] print_address_description.constprop.0+0x1d/0x140
[ 6.512502] ? __ps2_command+0x372/0x7e0
[ 6.512516] __kasan_report.cold+0x7d/0x112
[ 6.512527] ? _raw_write_lock_irq+0x20/0xd0
[ 6.512539] ? __ps2_command+0x372/0x7e0
[ 6.512552] kasan_report+0x3c/0x50
[ 6.512564] __asan_load1+0x6a/0x70
[ 6.512575] __ps2_command+0x372/0x7e0
[ 6.512589] ? ps2_drain+0x240/0x240
[ 6.512601] ? dev_printk_emit+0xa2/0xd3
[ 6.512612] ? dev_vprintk_emit+0xc5/0xc5
[ 6.512621] ? __kasan_check_write+0x14/0x20
[ 6.512634] ? mutex_lock+0x8f/0xe0
[ 6.512643] ? __mutex_lock_slowpath+0x20/0x20
[ 6.512655] ps2_command+0x52/0x90
[ 6.512670] elantech_ps2_command+0x4f/0xc0 [psmouse]
[ 6.512734] elantech_change_report_id+0x1e6/0x256 [psmouse]
[ 6.512799] ? elantech_report_trackpoint.constprop.0.cold+0xd/0xd [psmouse]
[ 6.512863] ? ps2_command+0x7f/0x90
[ 6.512877] elantech_query_info.cold+0x6bd/0x9ed [psmouse]
[ 6.512943] ? elantech_setup_ps2+0x460/0x460 [psmouse]
[ 6.513005] ? psmouse_reset+0x69/0xb0 [psmouse]
[ 6.513064] ? psmouse_attr_set_helper+0x2a0/0x2a0 [psmouse]
[ 6.513122] ? phys_pmd_init+0x30e/0x521
[ 6.513137] elantech_init+0x8a/0x200 [psmouse]
[ 6.513200] ? elantech_init_ps2+0xf0/0xf0 [psmouse]
[ 6.513249] ? elantech_query_info+0x440/0x440 [psmouse]
[ 6.513296] ? synaptics_send_cmd+0x60/0x60 [psmouse]
[ 6.513342] ? elantech_query_info+0x440/0x440 [psmouse]
[ 6.513388] ? psmouse_try_protocol+0x11e/0x170 [psmouse]
[ 6.513432] psmouse_extensions+0x65d/0x6e0 [psmouse]
[ 6.513476] ? psmouse_try_protocol+0x170/0x170 [psmouse]
[ 6.513519] ? mutex_unlock+0x22/0x40
[ 6.513526] ? ps2_command+0x7f/0x90
[ 6.513536] ? psmouse_probe+0xa3/0xf0 [psmouse]
[ 6.513580] psmouse_switch_protocol+0x27d/0x2e0 [psmouse]
[ 6.513624] psmouse_connect+0x272/0x530 [psmouse]
[ 6.513669] serio_driver_probe+0x55/0x70
[ 6.513679] really_probe+0x190/0x720
[ 6.513689] driver_probe_device+0x160/0x1f0
[ 6.513697] device_driver_attach+0x119/0x130
[ 6.513705] ? device_driver_attach+0x130/0x130
[ 6.513713] __driver_attach+0xe7/0x1a0
[ 6.513720] ? device_driver_attach+0x130/0x130
[ 6.513728] bus_for_each_dev+0xfb/0x150
[ 6.513738] ? subsys_dev_iter_exit+0x10/0x10
[ 6.513748] ? _raw_write_unlock_bh+0x30/0x30
[ 6.513757] driver_attach+0x2d/0x40
[ 6.513764] serio_handle_event+0x199/0x3d0
[ 6.513775] process_one_work+0x471/0x740
[ 6.513785] worker_thread+0x2d2/0x790
[ 6.513794] ? process_one_work+0x740/0x740
[ 6.513802] kthread+0x1b4/0x1e0
[ 6.513809] ? set_kthread_struct+0x80/0x80
[ 6.513816] ret_from_fork+0x22/0x30
[ 6.513832] The buggy address belongs to the page:
[ 6.513838] page:00000000bc35e189 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1024d7
[ 6.513847] flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)
[ 6.513860] raw: 0
---truncated---
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Entrada: elantech - arregla la pila fuera del acceso limitado en elantech_change_report_id() El parámetro de matriz[] en elantech_change_report_id() debe tener al menos 3 bytes, porque elantech_read_reg_params() está llamando a ps2_command( ) con PSMOUSE_CMD_GETINFO, que accederá a 3 bytes desde param[], pero está definido en la pila como una matriz de 2 bytes, por lo tanto, aquí tenemos un posible acceso fuera de los límites a la pila, también confirmado por KASAN: [6.512374 ] ERROR: KASAN: pila fuera de los límites en __ps2_command+0x372/0x7e0 [6.512397] Lectura del tamaño 1 en la dirección ffff8881024d77c2 por tarea kworker/2:1/118 [6.512416] CPU: 2 PID: 118 Comm: kworker/ 2:1 No contaminado 5.13.0-22-generic #22+arighi20211110 [6.512428] Nombre de hardware: LENOVO 20T8000QGE/20T8000QGE, BIOS R1AET32W (1.08) 14/08/2020 [6.512436] Cola de trabajo: events_long serio_handle_even t [6.512453] Seguimiento de llamadas: [6.512462] show_stack+0x52/0x58 [6.512474] dump_stack+0xa1/0xd3 [6.512487] print_address_description.constprop.0+0x1d/0x140 [6.512502]? __ps2_command+0x372/0x7e0 [6.512516] __kasan_report.cold+0x7d/0x112 [6.512527] ? _raw_write_lock_irq+0x20/0xd0 [6.512539]? __ps2_command+0x372/0x7e0 [ 6.512552] kasan_report+0x3c/0x50 [ 6.512564] __asan_load1+0x6a/0x70 [ 6.512575] __ps2_command+0x372/0x7e0 [ 6.512589] ? ps2_drain+0x240/0x240 [6.512601]? dev_printk_emit+0xa2/0xd3 [6.512612]? dev_vprintk_emit+0xc5/0xc5 [6.512621]? __kasan_check_write+0x14/0x20 [6.512634]? mutex_lock+0x8f/0xe0 [6.512643]? __mutex_lock_slowpath+0x20/0x20 [ 6.512655] ps2_command+0x52/0x90 [ 6.512670] elantech_ps2_command+0x4f/0xc0 [psmouse] [ 6.512734] elantech_change_report_id+0x1e6/0x256 [psmouse] [ 6.512799] ? elantech_report_trackpoint.constprop.0.cold+0xd/0xd [psmouse] [6.512863]? ps2_command+0x7f/0x90 [6.512877] elantech_query_info.cold+0x6bd/0x9ed [psmouse] [6.512943] ? elantech_setup_ps2+0x460/0x460 [psmouse] [6.513005]? psmouse_reset+0x69/0xb0 [psmouse] [6.513064]? psmouse_attr_set_helper+0x2a0/0x2a0 [psmouse] [6.513122]? phys_pmd_init+0x30e/0x521 [6.513137] elantech_init+0x8a/0x200 [psmouse] [6.513200]? elantech_init_ps2+0xf0/0xf0 [psmouse] [6.513249]? elantech_query_info+0x440/0x440 [psmouse] [6.513296]? synaptics_send_cmd+0x60/0x60 [psmouse] [6.513342]? elantech_query_info+0x440/0x440 [psmouse] [6.513388]? psmouse_try_protocol+0x11e/0x170 [psmouse] [6.513432] psmouse_extensions+0x65d/0x6e0 [psmouse] [6.513476]? psmouse_try_protocol+0x170/0x170 [psmouse] [6.513519]? mutex_unlock+0x22/0x40 [6.513526]? ps2_command+0x7f/0x90 [6.513536]? psmouse_probe+0xa3/0xf0 [psmouse] [ 6.513580] psmouse_switch_protocol+0x27d/0x2e0 [psmouse] [ 6.513624] psmouse_connect+0x272/0x530 [psmouse] [ 6.513669] serio_driver_probe+0x55/0x70 [ 6.513679] realmente_probe+0x190/0x720 [ 6.513689] driver_probe_device +0x160/0x1f0 [6.513697] dispositivo_driver_attach+0x119/0x130 [6.513705] ? dispositivo_driver_attach+0x130/0x130 [6.513713] __driver_attach+0xe7/0x1a0 [6.513720]? device_driver_attach+0x130/0x130 [6.513728] bus_for_each_dev+0xfb/0x150 [6.513738]? subsys_dev_iter_exit+0x10/0x10 [6.513748]? _raw_write_unlock_bh+0x30/0x30 [ 6.513757] driver_attach+0x2d/0x40 [ 6.513764] serio_handle_event+0x199/0x3d0 [ 6.513775] Process_one_work+0x471/0x740 [ 6.513785] trabajador_thread+0x2d2 /0x790 [6.513794] ? Process_one_work+0x740/0x740 [6.513802] kthread+0x1b4/0x1e0 [6.513809]? set_kthread_struct+0x80/0x80 [6.513816] ret_from_fork+0x22/0x30 [6.513832] La dirección del error pertenece a la página: [6.513838] página:00000000bc35e189 refcount:0 mapcount:0 mapeo:0000000000000000 index:0x0 pfn:0x1024d7 [6.513847] banderas: 0x17ffffc0000000(nodo=0|zona=2|lastcpupid=0x1fffff) [6.513860] sin procesar: 0
An out-of-bounds (OOB) stack memory access flaw was found in elantech_change_report_id in drivers/input/mouse/elantech.c in the Linux kernel’s elantech module. This flaw allows a local attacker to crash the system or leak kernel internal information.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-02-29 CVE Reserved
- 2024-03-04 CVE Published
- 2024-03-05 EPSS Updated
- 2024-08-04 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-125: Out-of-bounds Read
CAPEC
References (9)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/9e4815cf178561104881e5d687ef69396aca1c8d | Vuln. Introduced | |
| https://git.kernel.org/stable/c/dde807b4a44273fa5f62c0cb308295e6d6642550 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/e4c9062717feda88900b566463228d1c4910af6d | Vuln. Introduced |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2021-47097 | 2024-09-24 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2267925 | 2024-09-24 |
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" | >= 5.4.103 < 5.4.169 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.4.103 < 5.4.169" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.10.21 < 5.10.89 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.10.21 < 5.10.89" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.11 < 5.15.12 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.11 < 5.15.12" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.11 < 5.16 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.11 < 5.16" | en |
Affected
| ||||||