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CVE-2022-48651

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.7 · Élevée
EPSS 0.3%
Linux•Linux•Versions : 3.19, 0, 5.15.71, 5.4.215, <e2b46cd5796f083e452fbc624f65b80328b0c1a4, <=4.9.*, <=5.10.*, <=4.14.*, 6.0, <25efdbe5fe542c3063d1948cc4e98abcb57621ca, 4.14.295, <=5.4.*, <346e94aa4a99378592c46d6a34c72703a32bd5be, 2ad7bf3638411cb547f2823df08166c13ab04269, 5.10.146, <ab4a733874ead120691e8038272d22f8444d3638, <=4.19.*, 4.9.330, <81225b2ea161af48e093f58e8dfee6d705b16af4, <8d06006c7eb75587d986da46c48ba9274f94e8e7, <b583e6b25bf9321c91154f6c78d2173ef12c4241, <=*, 4.19.260, <=5.15.*, <bffcdade259c05ab3436b5fab711612093c275ef, <3.19, <=5.19.*, 5.19.12

Description

In the Linux kernel, the following vulnerability has been resolved: ipvlan: Fix out-of-bound bugs caused by unset skb->mac_header If an AF_PACKET socket is used to send packets through ipvlan and the default xmit function of the AF_PACKET socket is changed from dev_queue_xmit() to packet_direct_xmit() via setsockopt() with the option name of PACKET_QDISC_BYPASS, the skb->mac_header may not be reset and remains as the initial value of 65535, this may trigger slab-out-of-bounds bugs as following: ================================================================= UG: KASAN: slab-out-of-bounds in ipvlan_xmit_mode_l2+0xdb/0x330 [ipvlan] PU: 2 PID: 1768 Comm: raw_send Kdump: loaded Not tainted 6.0.0-rc4+ #6 ardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 all Trace: print_address_description.constprop.0+0x1d/0x160 print_report.cold+0x4f/0x112 kasan_report+0xa3/0x130 ipvlan_xmit_mode_l2+0xdb/0x330 [ipvlan] ipvlan_start_xmit+0x29/0xa0 [ipvlan] __dev_direct_xmit+0x2e2/0x380 packet_direct_xmit+0x22/0x60 packet_snd+0x7c9/0xc40 sock_sendmsg+0x9a/0xa0 __sys_sendto+0x18a/0x230 __x64_sys_sendto+0x74/0x90 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd The root cause is: 1. packet_snd() only reset skb->mac_header when sock->type is SOCK_RAW and skb->protocol is not specified as in packet_parse_headers() 2. packet_direct_xmit() doesn't reset skb->mac_header as dev_queue_xmit() In this case, skb->mac_header is 65535 when ipvlan_xmit_mode_l2() is called. So when ipvlan_xmit_mode_l2() gets mac header with eth_hdr() which use "skb->head + skb->mac_header", out-of-bound access occurs. This patch replaces eth_hdr() with skb_eth_hdr() in ipvlan_xmit_mode_l2() and reset mac header in multicast to solve this out-of-bound bug.

Gravité et risque d'exploitation

CVE-2022-48651 obtient un score CVSS de 7.7/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.25 %, ce qui la place devant 15.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 3.19, 0, 5.15.71, 5.4.215, <e2b46cd5796f083e452fbc624f65b80328b0c1a4, <=4.9.*, <=5.10.*, <=4.14.*, 6.0, <25efdbe5fe542c3063d1948cc4e98abcb57621ca, 4.14.295, <=5.4.*, <346e94aa4a99378592c46d6a34c72703a32bd5be, 2ad7bf3638411cb547f2823df08166c13ab04269, 5.10.146, <ab4a733874ead120691e8038272d22f8444d3638, <=4.19.*, 4.9.330, <81225b2ea161af48e093f58e8dfee6d705b16af4, <8d06006c7eb75587d986da46c48ba9274f94e8e7, <b583e6b25bf9321c91154f6c78d2173ef12c4241, <=*, 4.19.260, <=5.15.*, <bffcdade259c05ab3436b5fab711612093c275ef, <3.19, <=5.19.*, 5.19.12) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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