CVE-2021-47309
net: validate lwtstate->data before returning from skb_tunnel_info()
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
net: validate lwtstate->data before returning from skb_tunnel_info()
skb_tunnel_info() returns pointer of lwtstate->data as ip_tunnel_info
type without validation. lwtstate->data can have various types such as
mpls_iptunnel_encap, etc and these are not compatible.
So skb_tunnel_info() should validate before returning that pointer.
Splat looks like:
BUG: KASAN: slab-out-of-bounds in vxlan_get_route+0x418/0x4b0 [vxlan]
Read of size 2 at addr ffff888106ec2698 by task ping/811
CPU: 1 PID: 811 Comm: ping Not tainted 5.13.0+ #1195
Call Trace:
dump_stack_lvl+0x56/0x7b
print_address_description.constprop.8.cold.13+0x13/0x2ee
? vxlan_get_route+0x418/0x4b0 [vxlan]
? vxlan_get_route+0x418/0x4b0 [vxlan]
kasan_report.cold.14+0x83/0xdf
? vxlan_get_route+0x418/0x4b0 [vxlan]
vxlan_get_route+0x418/0x4b0 [vxlan]
[ ... ]
vxlan_xmit_one+0x148b/0x32b0 [vxlan]
[ ... ]
vxlan_xmit+0x25c5/0x4780 [vxlan]
[ ... ]
dev_hard_start_xmit+0x1ae/0x6e0
__dev_queue_xmit+0x1f39/0x31a0
[ ... ]
neigh_xmit+0x2f9/0x940
mpls_xmit+0x911/0x1600 [mpls_iptunnel]
lwtunnel_xmit+0x18f/0x450
ip_finish_output2+0x867/0x2040
[ ... ]
En el kernel de Linux, se resolvió la siguiente vulnerabilidad: net: validar lwtstate->data antes de regresar de skb_tunnel_info() skb_tunnel_info() devuelve un puntero de lwtstate->data como tipo ip_tunnel_info sin validación. lwtstate->data puede tener varios tipos como mpls_iptunnel_encap, etc. y estos no son compatibles. Entonces skb_tunnel_info() debería validarse antes de devolver ese puntero. Splat se ve así: BUG: KASAN: slab fuera de los límites en vxlan_get_route+0x418/0x4b0 [vxlan] Lectura de tamaño 2 en la dirección ffff888106ec2698 mediante tarea ping/811 CPU: 1 PID: 811 Comm: ping No contaminado 5.13.0 + #1195 Seguimiento de llamadas: dump_stack_lvl+0x56/0x7b print_address_description.constprop.8.cold.13+0x13/0x2ee? vxlan_get_route+0x418/0x4b0 [vxlan] ? vxlan_get_route+0x418/0x4b0 [vxlan] kasan_report.cold.14+0x83/0xdf? vxlan_get_route+0x418/0x4b0 [vxlan] vxlan_get_route+0x418/0x4b0 [vxlan] [ ... ] vxlan_xmit_one+0x148b/0x32b0 [vxlan] [ ... ] vxlan_xmit+0x25c5/0x4780 [vxlan] [ ... ] +0x1ae /0x6e0 __dev_queue_xmit+0x1f39/0x31a0 [...] veck_xMit+0x2f9/0x940 mpls_xmit+0x911/0x1600 [mpls_iptunnel] lwtunnel_xmit+0x18f/0x450 ip_finish_output2+0x20467/0x2040
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-05-21 CVE Reserved
- 2024-05-21 CVE Published
- 2024-05-22 EPSS Updated
- 2024-12-19 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (9)
URL | Tag | Source |
---|---|---|
https://git.kernel.org/stable/c/61adedf3e3f1d3f032c5a6a299978d91eff6d555 | Vuln. Introduced |
URL | Date | SRC |
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URL | Date | SRC |
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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" | >= 4.3 < 4.4.277 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 4.4.277" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.3 < 4.9.277 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 4.9.277" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.3 < 4.14.241 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 4.14.241" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.3 < 4.19.199 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 4.19.199" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.3 < 5.4.135 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 5.4.135" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.3 < 5.10.53 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 5.10.53" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.3 < 5.13.5 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 5.13.5" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.3 < 5.14 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 5.14" | en |
Affected
|