CVE-2021-47309
Linux Kernel Vxlan Mpls Out-Of-Bounds Read Vulnerability
Description
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 [ ... ]
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
Dec. 26, 2024, 6:44 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
5.2
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47309.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47309 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47309 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Dec. 26, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H Added CWE NIST CWE-125 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.3 up to (excluding) 4.4.277 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.5 up to (excluding) 4.9.277 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.10 up to (excluding) 4.14.241 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 4.19.199 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.135 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.53 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.13.5 *cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:* Changed Reference Type https://git.kernel.org/stable/c/2179d96ec702cc33ead02a9ce40ece599b8538c5 No Types Assigned https://git.kernel.org/stable/c/2179d96ec702cc33ead02a9ce40ece599b8538c5 Patch Changed Reference Type https://git.kernel.org/stable/c/2179d96ec702cc33ead02a9ce40ece599b8538c5 No Types Assigned https://git.kernel.org/stable/c/2179d96ec702cc33ead02a9ce40ece599b8538c5 Patch Changed Reference Type https://git.kernel.org/stable/c/67a9c94317402b826fc3db32afc8f39336803d97 No Types Assigned https://git.kernel.org/stable/c/67a9c94317402b826fc3db32afc8f39336803d97 Patch Changed Reference Type https://git.kernel.org/stable/c/67a9c94317402b826fc3db32afc8f39336803d97 No Types Assigned https://git.kernel.org/stable/c/67a9c94317402b826fc3db32afc8f39336803d97 Patch Changed Reference Type https://git.kernel.org/stable/c/83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d No Types Assigned https://git.kernel.org/stable/c/83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d Patch Changed Reference Type https://git.kernel.org/stable/c/83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d No Types Assigned https://git.kernel.org/stable/c/83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d Patch Changed Reference Type https://git.kernel.org/stable/c/8aa13a86964cdec4fd969ef677c6614ff068641a No Types Assigned https://git.kernel.org/stable/c/8aa13a86964cdec4fd969ef677c6614ff068641a Patch Changed Reference Type https://git.kernel.org/stable/c/8aa13a86964cdec4fd969ef677c6614ff068641a No Types Assigned https://git.kernel.org/stable/c/8aa13a86964cdec4fd969ef677c6614ff068641a Patch Changed Reference Type https://git.kernel.org/stable/c/8bb1589c89e61e3b182dd546f1021928ebb5c2a6 No Types Assigned https://git.kernel.org/stable/c/8bb1589c89e61e3b182dd546f1021928ebb5c2a6 Patch Changed Reference Type https://git.kernel.org/stable/c/8bb1589c89e61e3b182dd546f1021928ebb5c2a6 No Types Assigned https://git.kernel.org/stable/c/8bb1589c89e61e3b182dd546f1021928ebb5c2a6 Patch Changed Reference Type https://git.kernel.org/stable/c/a915379594f1e045421635c6316d8f3ffa018c58 No Types Assigned https://git.kernel.org/stable/c/a915379594f1e045421635c6316d8f3ffa018c58 Patch Changed Reference Type https://git.kernel.org/stable/c/a915379594f1e045421635c6316d8f3ffa018c58 No Types Assigned https://git.kernel.org/stable/c/a915379594f1e045421635c6316d8f3ffa018c58 Patch Changed Reference Type https://git.kernel.org/stable/c/b61d327cd3cc5ea591f3bf751dd11e034f388bb5 No Types Assigned https://git.kernel.org/stable/c/b61d327cd3cc5ea591f3bf751dd11e034f388bb5 Patch Changed Reference Type https://git.kernel.org/stable/c/b61d327cd3cc5ea591f3bf751dd11e034f388bb5 No Types Assigned https://git.kernel.org/stable/c/b61d327cd3cc5ea591f3bf751dd11e034f388bb5 Patch Changed Reference Type https://git.kernel.org/stable/c/e7f3c9df40515a6c6b46f36c4c94cf48a043f887 No Types Assigned https://git.kernel.org/stable/c/e7f3c9df40515a6c6b46f36c4c94cf48a043f887 Patch Changed Reference Type https://git.kernel.org/stable/c/e7f3c9df40515a6c6b46f36c4c94cf48a043f887 No Types Assigned https://git.kernel.org/stable/c/e7f3c9df40515a6c6b46f36c4c94cf48a043f887 Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/2179d96ec702cc33ead02a9ce40ece599b8538c5 Added Reference https://git.kernel.org/stable/c/67a9c94317402b826fc3db32afc8f39336803d97 Added Reference https://git.kernel.org/stable/c/83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d Added Reference https://git.kernel.org/stable/c/8aa13a86964cdec4fd969ef677c6614ff068641a Added Reference https://git.kernel.org/stable/c/8bb1589c89e61e3b182dd546f1021928ebb5c2a6 Added Reference https://git.kernel.org/stable/c/a915379594f1e045421635c6316d8f3ffa018c58 Added Reference https://git.kernel.org/stable/c/b61d327cd3cc5ea591f3bf751dd11e034f388bb5 Added Reference https://git.kernel.org/stable/c/e7f3c9df40515a6c6b46f36c4c94cf48a043f887 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 21, 2024
Action Type Old Value New Value Added Description 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 [ ... ] Added Reference kernel.org https://git.kernel.org/stable/c/e7f3c9df40515a6c6b46f36c4c94cf48a043f887 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/b61d327cd3cc5ea591f3bf751dd11e034f388bb5 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/8bb1589c89e61e3b182dd546f1021928ebb5c2a6 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/8aa13a86964cdec4fd969ef677c6614ff068641a [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/2179d96ec702cc33ead02a9ce40ece599b8538c5 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/a915379594f1e045421635c6316d8f3ffa018c58 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/67a9c94317402b826fc3db32afc8f39336803d97 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47309 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47309
weaknesses.