CVE-2024-26951
wireguard: netlink: check for dangling peer via is_dead instead of empty list
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
wireguard: netlink: check for dangling peer via is_dead instead of empty list
If all peers are removed via wg_peer_remove_all(), rather than setting
peer_list to empty, the peer is added to a temporary list with a head on
the stack of wg_peer_remove_all(). If a netlink dump is resumed and the
cursored peer is one that has been removed via wg_peer_remove_all(), it
will iterate from that peer and then attempt to dump freed peers.
Fix this by instead checking peer->is_dead, which was explictly created
for this purpose. Also move up the device_update_lock lockdep assertion,
since reading is_dead relies on that.
It can be reproduced by a small script like:
echo "Setting config..."
ip link add dev wg0 type wireguard
wg setconf wg0 /big-config
(
while true; do
echo "Showing config..."
wg showconf wg0 > /dev/null
done
) &
sleep 4
wg setconf wg0 <(printf "[Peer]
PublicKey=$(wg genkey)
")
Resulting in:
BUG: KASAN: slab-use-after-free in __lock_acquire+0x182a/0x1b20
Read of size 8 at addr ffff88811956ec70 by task wg/59
CPU: 2 PID: 59 Comm: wg Not tainted 6.8.0-rc2-debug+ #5
Call Trace:
<TASK>
dump_stack_lvl+0x47/0x70
print_address_description.constprop.0+0x2c/0x380
print_report+0xab/0x250
kasan_report+0xba/0xf0
__lock_acquire+0x182a/0x1b20
lock_acquire+0x191/0x4b0
down_read+0x80/0x440
get_peer+0x140/0xcb0
wg_get_device_dump+0x471/0x1130
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: wireguard: netlink: verifique si hay pares pendientes a través de is_dead en lugar de una lista vacía. Si todos los pares se eliminan a través de wg_peer_remove_all(), en lugar de configurar peer_list como vacío, el par se agrega a una lista temporal. lista con un encabezado en la pila de wg_peer_remove_all(). Si se reanuda un volcado de netlink y el par seleccionado es uno que se eliminó mediante wg_peer_remove_all(), iterará desde ese par y luego intentará volcar los pares liberados. Para solucionar este problema, marque peer->is_dead, que se creó explícitamente para este propósito. También suba la aserción de bloqueo de dispositivo_update_lock, ya que la lectura is_dead depende de eso. Se puede reproducir mediante un pequeño script como: echo "Configuración de configuración..." ip link add dev wg0 tipo wireguard wg setconf wg0 /big-config (mientras sea verdadero; haga echo "Mostrando configuración..." wg showconf wg0 > / dev/null done) & sleep 4 wg setconf wg0 <(printf "[Peer]
PublicKey=$(wg genkey)
") Resultando en: ERROR: KASAN: slab-use-after-free en __lock_acquire+0x182a/0x1b20 Lectura de tamaño 8 en la dirección ffff88811956ec70 mediante la tarea wg/59 CPU: 2 PID: 59 Comm: wg Not tainted 6.8.0-rc2-debug+ #5 Seguimiento de llamadas: dump_stack_lvl+0x47/0x70 print_address_description.constprop.0+0x2c /0x380 print_report+0xab/0x250 kasan_report+0xba/0xf0 __lock_acquire+0x182a/0x1b20 lock_acquire+0x191/0x4b0 down_read+0x80/0x440 get_peer+0x140/0xcb0 wg_get_device_dump+0x471/0x1130
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-02-19 CVE Reserved
- 2024-05-01 CVE Published
- 2024-05-01 EPSS Updated
- 2024-12-19 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (11)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/e7096c131e5161fa3b8e52a650d7719d2857adfd | Vuln. Introduced | |
| https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html |
|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2024-26951 | 2024-11-12 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2278197 | 2024-11-12 |
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" | >= 5.6 < 5.10.215 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.6 < 5.10.215" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.6 < 5.15.154 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.6 < 5.15.154" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.6 < 6.1.84 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.6 < 6.1.84" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.6 < 6.6.24 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.6 < 6.6.24" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.6 < 6.7.12 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.6 < 6.7.12" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.6 < 6.8.3 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.6 < 6.8.3" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.6 < 6.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.6 < 6.9" | en |
Affected
| ||||||