net: ip_tunnel：确保在 ip_tunnel_rcv() 中提取内部标头 (CVE-2024-26882)

CVE编号

CVE-2024-26882

利用情况

暂无

补丁情况

N/A

披露时间

2024-04-17
漏洞描述
In the Linux kernel, the following vulnerability has been resolved:

net: ip_tunnel: make sure to pull inner header in ip_tunnel_rcv()

Apply the same fix than ones found in :

8d975c15c0cd ("ip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()")
1ca1ba465e55 ("geneve: make sure to pull inner header in geneve_rx()")

We have to save skb->network_header in a temporary variable
in order to be able to recompute the network_header pointer
after a pskb_inet_may_pull() call.

pskb_inet_may_pull() makes sure the needed headers are in skb->head.

syzbot reported:
BUG: KMSAN: uninit-value in __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]
BUG: KMSAN: uninit-value in INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]
BUG: KMSAN: uninit-value in IP_ECN_decapsulate include/net/inet_ecn.h:302 [inline]
BUG: KMSAN: uninit-value in ip_tunnel_rcv+0xed9/0x2ed0 net/ipv4/ip_tunnel.c:409
__INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]
INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]
IP_ECN_decapsulate include/net/inet_ecn.h:302 [inline]
ip_tunnel_rcv+0xed9/0x2ed0 net/ipv4/ip_tunnel.c:409
__ipgre_rcv+0x9bc/0xbc0 net/ipv4/ip_gre.c:389
ipgre_rcv net/ipv4/ip_gre.c:411 [inline]
gre_rcv+0x423/0x19f0 net/ipv4/ip_gre.c:447
gre_rcv+0x2a4/0x390 net/ipv4/gre_demux.c:163
ip_protocol_deliver_rcu+0x264/0x1300 net/ipv4/ip_input.c:205
ip_local_deliver_finish+0x2b8/0x440 net/ipv4/ip_input.c:233
NF_HOOK include/linux/netfilter.h:314 [inline]
ip_local_deliver+0x21f/0x490 net/ipv4/ip_input.c:254
dst_input include/net/dst.h:461 [inline]
ip_rcv_finish net/ipv4/ip_input.c:449 [inline]
NF_HOOK include/linux/netfilter.h:314 [inline]
ip_rcv+0x46f/0x760 net/ipv4/ip_input.c:569
__netif_receive_skb_one_core net/core/dev.c:5534 [inline]
__netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5648
netif_receive_skb_internal net/core/dev.c:5734 [inline]
netif_receive_skb+0x58/0x660 net/core/dev.c:5793
tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1556
tun_get_user+0x53b9/0x66e0 drivers/net/tun.c:2009
tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2055
call_write_iter include/linux/fs.h:2087 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xb6b/0x1520 fs/read_write.c:590
ksys_write+0x20f/0x4c0 fs/read_write.c:643
__do_sys_write fs/read_write.c:655 [inline]
__se_sys_write fs/read_write.c:652 [inline]
__x64_sys_write+0x93/0xd0 fs/read_write.c:652
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was created at:
__alloc_pages+0x9a6/0xe00 mm/page_alloc.c:4590
alloc_pages_mpol+0x62b/0x9d0 mm/mempolicy.c:2133
alloc_pages+0x1be/0x1e0 mm/mempolicy.c:2204
skb_page_frag_refill+0x2bf/0x7c0 net/core/sock.c:2909
tun_build_skb drivers/net/tun.c:1686 [inline]
tun_get_user+0xe0a/0x66e0 drivers/net/tun.c:1826
tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2055
call_write_iter include/linux/fs.h:2087 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xb6b/0x1520 fs/read_write.c:590
ksys_write+0x20f/0x4c0 fs/read_write.c:643
__do_sys_write fs/read_write.c:655 [inline]
__se_sys_write fs/read_write.c:652 [inline]
__x64_sys_write+0x93/0xd0 fs/read_write.c:652
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
解决建议
建议您更新当前系统或软件至最新版，完成漏洞的修复。
参考链接
https://git.kernel.org/stable/c/5c03387021cfa3336b97e0dcba38029917a8af2a
https://git.kernel.org/stable/c/60044ab84836359534bd7153b92e9c1584140e4a
https://git.kernel.org/stable/c/77fd5294ea09b21f6772ac954a121b87323cec80
https://git.kernel.org/stable/c/b0ec2abf98267f14d032102551581c833b0659d3
https://git.kernel.org/stable/c/c4c857723b37c20651300b3de4ff25059848b4b0
https://git.kernel.org/stable/c/ca914f1cdee8a85799942c9b0ce5015bbd6844e1
https://git.kernel.org/stable/c/ec6bb01e02cbd47781dd90775b631a1dc4bd9d2b
https://git.kernel.org/stable/c/f6723d8dbfdc10c784a56748f86a9a3cd410dbd5
受影响软件情况
# 类型 厂商 产品 版本 影响面
1
运行在以下环境
系统 debian_12 linux * Up to
(excluding)
6.1.85-1
运行在以下环境
系统 linux linux_kernel * From
(including)
3.10 		Up to
(excluding)
5.4.273
运行在以下环境
系统 linux linux_kernel * From
(including)
5.11 		Up to
(excluding)
5.15.153
运行在以下环境
系统 linux linux_kernel * From
(including)
5.16 		Up to
(excluding)
6.1.83
运行在以下环境
系统 linux linux_kernel * From
(including)
5.5 		Up to
(excluding)
5.10.214
运行在以下环境
系统 linux linux_kernel * From
(including)
6.2 		Up to
(excluding)
6.6.23
运行在以下环境
系统 linux linux_kernel * From
(including)
6.7 		Up to
(excluding)
6.7.11
运行在以下环境
系统 linux linux_kernel * From
(including)
6.8 		Up to
(excluding)
6.8.2
CVSS3评分
7.8
  • 攻击路径
    本地
  • 攻击复杂度
    低
  • 权限要求
    低
  • 影响范围
    未更改
  • 用户交互
    无
  • 可用性
    高
  • 保密性
    高
  • 完整性
    高
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-ID 漏洞类型
NVD-CWE-noinfo
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