ghsa-q884-jcxw-49wr
Vulnerability from github
Published
2024-06-19 15:30
Modified
2024-08-19 18:32
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Details

In the Linux kernel, the following vulnerability has been resolved:

inet_diag: fix kernel-infoleak for UDP sockets

KMSAN reported a kernel-infoleak [1], that can exploited by unpriv users.

After analysis it turned out UDP was not initializing r->idiag_expires. Other users of inet_sk_diag_fill() might make the same mistake in the future, so fix this in inet_sk_diag_fill().

[1] BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline] BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:156 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x69d/0x25c0 lib/iov_iter.c:670 instrument_copy_to_user include/linux/instrumented.h:121 [inline] copyout lib/iov_iter.c:156 [inline] _copy_to_iter+0x69d/0x25c0 lib/iov_iter.c:670 copy_to_iter include/linux/uio.h:155 [inline] simple_copy_to_iter+0xf3/0x140 net/core/datagram.c:519 __skb_datagram_iter+0x2cb/0x1280 net/core/datagram.c:425 skb_copy_datagram_iter+0xdc/0x270 net/core/datagram.c:533 skb_copy_datagram_msg include/linux/skbuff.h:3657 [inline] netlink_recvmsg+0x660/0x1c60 net/netlink/af_netlink.c:1974 sock_recvmsg_nosec net/socket.c:944 [inline] sock_recvmsg net/socket.c:962 [inline] sock_read_iter+0x5a9/0x630 net/socket.c:1035 call_read_iter include/linux/fs.h:2156 [inline] new_sync_read fs/read_write.c:400 [inline] vfs_read+0x1631/0x1980 fs/read_write.c:481 ksys_read+0x28c/0x520 fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [inline] __se_sys_read fs/read_write.c:627 [inline] __x64_sys_read+0xdb/0x120 fs/read_write.c:627 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae

Uninit was created at: slab_post_alloc_hook mm/slab.h:524 [inline] slab_alloc_node mm/slub.c:3251 [inline] __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4974 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0x545/0xf90 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1126 [inline] netlink_dump+0x3d5/0x16a0 net/netlink/af_netlink.c:2245 __netlink_dump_start+0xd1c/0xee0 net/netlink/af_netlink.c:2370 netlink_dump_start include/linux/netlink.h:254 [inline] inet_diag_handler_cmd+0x2e7/0x400 net/ipv4/inet_diag.c:1343 sock_diag_rcv_msg+0x24a/0x620 netlink_rcv_skb+0x447/0x800 net/netlink/af_netlink.c:2491 sock_diag_rcv+0x63/0x80 net/core/sock_diag.c:276 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x1095/0x1360 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x16f3/0x1870 net/netlink/af_netlink.c:1916 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] sock_write_iter+0x594/0x690 net/socket.c:1057 do_iter_readv_writev+0xa7f/0xc70 do_iter_write+0x52c/0x1500 fs/read_write.c:851 vfs_writev fs/read_write.c:924 [inline] do_writev+0x63f/0xe30 fs/read_write.c:967 __do_sys_writev fs/read_write.c:1040 [inline] __se_sys_writev fs/read_write.c:1037 [inline] __x64_sys_writev+0xe5/0x120 fs/read_write.c:1037 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae

Bytes 68-71 of 312 are uninitialized Memory access of size 312 starts at ffff88812ab54000 Data copied to user address 0000000020001440

CPU: 1 PID: 6365 Comm: syz-executor801 Not tainted 5.16.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

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{
   affected: [],
   aliases: [
      "CVE-2021-47597",
   ],
   database_specific: {
      cwe_ids: [
         "CWE-908",
      ],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2024-06-19T15:15:54Z",
      severity: "MODERATE",
   },
   details: "In the Linux kernel, the following vulnerability has been resolved:\n\ninet_diag: fix kernel-infoleak for UDP sockets\n\nKMSAN reported a kernel-infoleak [1], that can exploited\nby unpriv users.\n\nAfter analysis it turned out UDP was not initializing\nr->idiag_expires. Other users of inet_sk_diag_fill()\nmight make the same mistake in the future, so fix this\nin inet_sk_diag_fill().\n\n[1]\nBUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline]\nBUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:156 [inline]\nBUG: KMSAN: kernel-infoleak in _copy_to_iter+0x69d/0x25c0 lib/iov_iter.c:670\n instrument_copy_to_user include/linux/instrumented.h:121 [inline]\n copyout lib/iov_iter.c:156 [inline]\n _copy_to_iter+0x69d/0x25c0 lib/iov_iter.c:670\n copy_to_iter include/linux/uio.h:155 [inline]\n simple_copy_to_iter+0xf3/0x140 net/core/datagram.c:519\n __skb_datagram_iter+0x2cb/0x1280 net/core/datagram.c:425\n skb_copy_datagram_iter+0xdc/0x270 net/core/datagram.c:533\n skb_copy_datagram_msg include/linux/skbuff.h:3657 [inline]\n netlink_recvmsg+0x660/0x1c60 net/netlink/af_netlink.c:1974\n sock_recvmsg_nosec net/socket.c:944 [inline]\n sock_recvmsg net/socket.c:962 [inline]\n sock_read_iter+0x5a9/0x630 net/socket.c:1035\n call_read_iter include/linux/fs.h:2156 [inline]\n new_sync_read fs/read_write.c:400 [inline]\n vfs_read+0x1631/0x1980 fs/read_write.c:481\n ksys_read+0x28c/0x520 fs/read_write.c:619\n __do_sys_read fs/read_write.c:629 [inline]\n __se_sys_read fs/read_write.c:627 [inline]\n __x64_sys_read+0xdb/0x120 fs/read_write.c:627\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nUninit was created at:\n slab_post_alloc_hook mm/slab.h:524 [inline]\n slab_alloc_node mm/slub.c:3251 [inline]\n __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4974\n kmalloc_reserve net/core/skbuff.c:354 [inline]\n __alloc_skb+0x545/0xf90 net/core/skbuff.c:426\n alloc_skb include/linux/skbuff.h:1126 [inline]\n netlink_dump+0x3d5/0x16a0 net/netlink/af_netlink.c:2245\n __netlink_dump_start+0xd1c/0xee0 net/netlink/af_netlink.c:2370\n netlink_dump_start include/linux/netlink.h:254 [inline]\n inet_diag_handler_cmd+0x2e7/0x400 net/ipv4/inet_diag.c:1343\n sock_diag_rcv_msg+0x24a/0x620\n netlink_rcv_skb+0x447/0x800 net/netlink/af_netlink.c:2491\n sock_diag_rcv+0x63/0x80 net/core/sock_diag.c:276\n netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]\n netlink_unicast+0x1095/0x1360 net/netlink/af_netlink.c:1345\n netlink_sendmsg+0x16f3/0x1870 net/netlink/af_netlink.c:1916\n sock_sendmsg_nosec net/socket.c:704 [inline]\n sock_sendmsg net/socket.c:724 [inline]\n sock_write_iter+0x594/0x690 net/socket.c:1057\n do_iter_readv_writev+0xa7f/0xc70\n do_iter_write+0x52c/0x1500 fs/read_write.c:851\n vfs_writev fs/read_write.c:924 [inline]\n do_writev+0x63f/0xe30 fs/read_write.c:967\n __do_sys_writev fs/read_write.c:1040 [inline]\n __se_sys_writev fs/read_write.c:1037 [inline]\n __x64_sys_writev+0xe5/0x120 fs/read_write.c:1037\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nBytes 68-71 of 312 are uninitialized\nMemory access of size 312 starts at ffff88812ab54000\nData copied to user address 0000000020001440\n\nCPU: 1 PID: 6365 Comm: syz-executor801 Not tainted 5.16.0-rc3-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011",
   id: "GHSA-q884-jcxw-49wr",
   modified: "2024-08-19T18:32:03Z",
   published: "2024-06-19T15:30:55Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2021-47597",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/3a4f6dba1eb98101abc012ef968a8b10dac1ce50",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/71ddeac8cd1d217744a0e060ff520e147c9328d1",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/7b5596e531253ce84213d9daa7120b71c9d83198",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/e5d28205bf1de7082d904ed277ceb2db2879e302",
      },
   ],
   schema_version: "1.4.0",
   severity: [
      {
         score: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
         type: "CVSS_V3",
      },
   ],
}


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