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ipvlan: Fix out-of-bound bugs caused by unset skb->mac_header (Linux Linux)

CVE-2022-48651
HIGH 7.7

En bref

Source
NVD
EPSS
EPSS 0.25 % · centile 17 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Analyzed

Rechercher sur…

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.

Faiblesses (CWE)

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.7CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HCISA-ADP
CVSS 3.1HIGH 7.7CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HNVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 2ad7bf3638411cb547f2823df08166c13ab04269 < e2b46cd5796f083e452fbc624f65b80328b0c1a4 ; affected 2ad7bf3638411cb547f2823df08166c13ab04269 < 25efdbe5fe542c3063d1948cc4e98abcb57621ca ; affected 2ad7bf3638411cb547f2823df08166c13ab04269 < bffcdade259c05ab3436b5fab711612093c275ef ; affected 2ad7bf3638411cb547f2823df08166c13ab04269 < 346e94aa4a99378592c46d6a34c72703a32bd5be ; affected 2ad7bf3638411cb547f2823df08166c13ab04269 < ab4a733874ead120691e8038272d22f8444d3638 ; affected 2ad7bf3638411cb547f2823df08166c13ab04269 < 8d06006c7eb75587d986da46c48ba9274f94e8e7
Linux · Linuxaffected 3.19 ; unaffected 0 < 3.19 ; unaffected 4.9.330 ≤ 4.9.* ; unaffected 4.14.295 ≤ 4.14.* ; unaffected 4.19.260 ≤ 4.19.* ; unaffected 5.4.215 ≤ 5.4.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD