ghsa-74mq-wr7w-wwvw
Vulnerability from github
Published
2024-07-16 15:30
Modified
2024-07-23 15:31
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Details

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

sctp: fix kernel-infoleak for SCTP sockets

syzbot reported a kernel infoleak [1] of 4 bytes.

After analysis, it turned out r->idiag_expires is not initialized if inet_sctp_diag_fill() calls inet_diag_msg_common_fill()

Make sure to clear idiag_timer/idiag_retrans/idiag_expires and let inet_diag_msg_sctpasoc_fill() fill them again if needed.

[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:154 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x6ef/0x25a0 lib/iov_iter.c:668 instrument_copy_to_user include/linux/instrumented.h:121 [inline] copyout lib/iov_iter.c:154 [inline] _copy_to_iter+0x6ef/0x25a0 lib/iov_iter.c:668 copy_to_iter include/linux/uio.h:162 [inline] simple_copy_to_iter+0xf3/0x140 net/core/datagram.c:519 __skb_datagram_iter+0x2d5/0x11b0 net/core/datagram.c:425 skb_copy_datagram_iter+0xdc/0x270 net/core/datagram.c:533 skb_copy_datagram_msg include/linux/skbuff.h:3696 [inline] netlink_recvmsg+0x669/0x1c80 net/netlink/af_netlink.c:1977 sock_recvmsg_nosec net/socket.c:948 [inline] sock_recvmsg net/socket.c:966 [inline] __sys_recvfrom+0x795/0xa10 net/socket.c:2097 __do_sys_recvfrom net/socket.c:2115 [inline] __se_sys_recvfrom net/socket.c:2111 [inline] __x64_sys_recvfrom+0x19d/0x210 net/socket.c:2111 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:737 [inline] slab_alloc_node mm/slub.c:3247 [inline] __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4975 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0x545/0xf90 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1158 [inline] netlink_dump+0x3e5/0x16c0 net/netlink/af_netlink.c:2248 __netlink_dump_start+0xcf8/0xe90 net/netlink/af_netlink.c:2373 netlink_dump_start include/linux/netlink.h:254 [inline] inet_diag_handler_cmd+0x2e7/0x400 net/ipv4/inet_diag.c:1341 sock_diag_rcv_msg+0x24a/0x620 netlink_rcv_skb+0x40c/0x7e0 net/netlink/af_netlink.c:2494 sock_diag_rcv+0x63/0x80 net/core/sock_diag.c:277 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x1093/0x1360 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x14d9/0x1720 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg net/socket.c:725 [inline] sock_write_iter+0x594/0x690 net/socket.c:1061 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+0x645/0xe00 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 2508 are uninitialized Memory access of size 2508 starts at ffff888114f9b000 Data copied to user address 00007f7fe09ff2e0

CPU: 1 PID: 3478 Comm: syz-executor306 Not tainted 5.17.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

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{
  "affected": [],
  "aliases": [
    "CVE-2022-48855"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-16T13:15:12Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix kernel-infoleak for SCTP sockets\n\nsyzbot reported a kernel infoleak [1] of 4 bytes.\n\nAfter analysis, it turned out r-\u003eidiag_expires is not initialized\nif inet_sctp_diag_fill() calls inet_diag_msg_common_fill()\n\nMake sure to clear idiag_timer/idiag_retrans/idiag_expires\nand let inet_diag_msg_sctpasoc_fill() fill them again if needed.\n\n[1]\n\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:154 [inline]\nBUG: KMSAN: kernel-infoleak in _copy_to_iter+0x6ef/0x25a0 lib/iov_iter.c:668\n instrument_copy_to_user include/linux/instrumented.h:121 [inline]\n copyout lib/iov_iter.c:154 [inline]\n _copy_to_iter+0x6ef/0x25a0 lib/iov_iter.c:668\n copy_to_iter include/linux/uio.h:162 [inline]\n simple_copy_to_iter+0xf3/0x140 net/core/datagram.c:519\n __skb_datagram_iter+0x2d5/0x11b0 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:3696 [inline]\n netlink_recvmsg+0x669/0x1c80 net/netlink/af_netlink.c:1977\n sock_recvmsg_nosec net/socket.c:948 [inline]\n sock_recvmsg net/socket.c:966 [inline]\n __sys_recvfrom+0x795/0xa10 net/socket.c:2097\n __do_sys_recvfrom net/socket.c:2115 [inline]\n __se_sys_recvfrom net/socket.c:2111 [inline]\n __x64_sys_recvfrom+0x19d/0x210 net/socket.c:2111\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:737 [inline]\n slab_alloc_node mm/slub.c:3247 [inline]\n __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4975\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:1158 [inline]\n netlink_dump+0x3e5/0x16c0 net/netlink/af_netlink.c:2248\n __netlink_dump_start+0xcf8/0xe90 net/netlink/af_netlink.c:2373\n netlink_dump_start include/linux/netlink.h:254 [inline]\n inet_diag_handler_cmd+0x2e7/0x400 net/ipv4/inet_diag.c:1341\n sock_diag_rcv_msg+0x24a/0x620\n netlink_rcv_skb+0x40c/0x7e0 net/netlink/af_netlink.c:2494\n sock_diag_rcv+0x63/0x80 net/core/sock_diag.c:277\n netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]\n netlink_unicast+0x1093/0x1360 net/netlink/af_netlink.c:1343\n netlink_sendmsg+0x14d9/0x1720 net/netlink/af_netlink.c:1919\n sock_sendmsg_nosec net/socket.c:705 [inline]\n sock_sendmsg net/socket.c:725 [inline]\n sock_write_iter+0x594/0x690 net/socket.c:1061\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+0x645/0xe00 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 2508 are uninitialized\nMemory access of size 2508 starts at ffff888114f9b000\nData copied to user address 00007f7fe09ff2e0\n\nCPU: 1 PID: 3478 Comm: syz-executor306 Not tainted 5.17.0-rc4-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011",
  "id": "GHSA-74mq-wr7w-wwvw",
  "modified": "2024-07-23T15:31:08Z",
  "published": "2024-07-16T15:30:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48855"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1502f15b9f29c41883a6139f2923523873282a83"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d8fa3fdf4542a2174a72d92018f488d65d848c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3fc0fd724d199e061432b66a8d85b7d48fe485f7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41a2864cf719c17294f417726edd411643462ab8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/633593a808980f82d251d0ca89730d8bb8b0220c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7e4d9ba2ddb78801488b4c623875b81fb46b545"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bbf59d7ae558940cfa2b36a287fd1e88d83f89f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d828b0fe6631f3ae8709ac9a10c77c5836c76a08"
    }
  ],
  "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:H",
      "type": "CVSS_V3"
    }
  ]
}


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