nvd-json-data-feeds/CVE-2022/CVE-2022-492xx/CVE-2022-49271.json

{
  "id": "CVE-2022-49271",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-02-26T07:01:04.000",
  "lastModified": "2025-02-26T07:01:04.000",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: prevent bad output lengths in smb2_ioctl_query_info()\n\nWhen calling smb2_ioctl_query_info() with\nsmb_query_info::flags=PASSTHRU_FSCTL and\nsmb_query_info::output_buffer_length=0, the following would return\n0x10\n\n\tbuffer = memdup_user(arg + sizeof(struct smb_query_info),\n\t\t\t     qi.output_buffer_length);\n\tif (IS_ERR(buffer)) {\n\t\tkfree(vars);\n\t\treturn PTR_ERR(buffer);\n\t}\n\nrather than a valid pointer thus making IS_ERR() check fail.  This\nwould then cause a NULL ptr deference in @buffer when accessing it\nlater in smb2_ioctl_query_ioctl().  While at it, prevent having a\n@buffer smaller than 8 bytes to correctly handle SMB2_SET_INFO\nFileEndOfFileInformation requests when\nsmb_query_info::flags=PASSTHRU_SET_INFO.\n\nHere is a small C reproducer which triggers a NULL ptr in @buffer when\npassing an invalid smb_query_info::flags\n\n\t#include <stdio.h>\n\t#include <stdlib.h>\n\t#include <stdint.h>\n\t#include <unistd.h>\n\t#include <fcntl.h>\n\t#include <sys/ioctl.h>\n\n\t#define die(s) perror(s), exit(1)\n\t#define QUERY_INFO 0xc018cf07\n\n\tint main(int argc, char *argv[])\n\t{\n\t\tint fd;\n\n\t\tif (argc < 2)\n\t\t\texit(1);\n\t\tfd = open(argv[1], O_RDONLY);\n\t\tif (fd == -1)\n\t\t\tdie(\"open\");\n\t\tif (ioctl(fd, QUERY_INFO, (uint32_t[]) { 0, 0, 0, 4, 0, 0}) == -1)\n\t\t\tdie(\"ioctl\");\n\t\tclose(fd);\n\t\treturn 0;\n\t}\n\n\tmount.cifs //srv/share /mnt -o ...\n\tgcc repro.c && ./a.out /mnt/f0\n\n\t[  114.138620] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI\n\t[  114.139310] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n\t[  114.139775] CPU: 2 PID: 995 Comm: a.out Not tainted 5.17.0-rc8 #1\n\t[  114.140148] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014\n\t[  114.140818] RIP: 0010:smb2_ioctl_query_info+0x206/0x410 [cifs]\n\t[  114.141221] Code: 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 c8 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 7b 28 4c 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 9c 01 00 00 49 8b 3f e8 58 02 fb ff 48 8b 14 24\n\t[  114.142348] RSP: 0018:ffffc90000b47b00 EFLAGS: 00010256\n\t[  114.142692] RAX: dffffc0000000000 RBX: ffff888115503200 RCX: ffffffffa020580d\n\t[  114.143119] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffffa043a380\n\t[  114.143544] RBP: ffff888115503278 R08: 0000000000000001 R09: 0000000000000003\n\t[  114.143983] R10: fffffbfff4087470 R11: 0000000000000001 R12: ffff888115503288\n\t[  114.144424] R13: 00000000ffffffea R14: ffff888115503228 R15: 0000000000000000\n\t[  114.144852] FS:  00007f7aeabdf740(0000) GS:ffff888151600000(0000) knlGS:0000000000000000\n\t[  114.145338] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n\t[  114.145692] CR2: 00007f7aeacfdf5e CR3: 000000012000e000 CR4: 0000000000350ee0\n\t[  114.146131] Call Trace:\n\t[  114.146291]  <TASK>\n\t[  114.146432]  ? smb2_query_reparse_tag+0x890/0x890 [cifs]\n\t[  114.146800]  ? cifs_mapchar+0x460/0x460 [cifs]\n\t[  114.147121]  ? rcu_read_lock_sched_held+0x3f/0x70\n\t[  114.147412]  ? cifs_strndup_to_utf16+0x15b/0x250 [cifs]\n\t[  114.147775]  ? dentry_path_raw+0xa6/0xf0\n\t[  114.148024]  ? cifs_convert_path_to_utf16+0x198/0x220 [cifs]\n\t[  114.148413]  ? smb2_check_message+0x1080/0x1080 [cifs]\n\t[  114.148766]  ? rcu_read_lock_sched_held+0x3f/0x70\n\t[  114.149065]  cifs_ioctl+0x1577/0x3320 [cifs]\n\t[  114.149371]  ? lock_downgrade+0x6f0/0x6f0\n\t[  114.149631]  ? cifs_readdir+0x2e60/0x2e60 [cifs]\n\t[  114.149956]  ? rcu_read_lock_sched_held+0x3f/0x70\n\t[  114.150250]  ? __rseq_handle_notify_resume+0x80b/0xbe0\n\t[  114.150562]  ? __up_read+0x192/0x710\n\t[  114.150791]  ? __ia32_sys_rseq+0xf0/0xf0\n\t[  114.151025]  ? __x64_sys_openat+0x11f/0x1d0\n\t[  114.151296]  __x64_sys_ioctl+0x127/0x190\n\t[  114.151549]  do_syscall_64+0x3b/0x90\n\t[  114.151768]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n\t[  114.152079] RIP: 0033:0x7f7aead043df\n\t[  114.152306] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cifs: evitar longitudes de salida incorrectas en smb2_ioctl_query_info() Al llamar a smb2_ioctl_query_info() con smb_query_info::flags=PASSTHRU_FSCTL y smb_query_info::output_buffer_length=0, lo siguiente devolver\u00eda 0x10 buffer = memdup_user(arg + sizeof(struct smb_query_info), qi.output_buffer_length); if (IS_ERR(buffer)) { kfree(vars); return PTR_ERR(buffer); } en lugar de un puntero v\u00e1lido, lo que hace que la comprobaci\u00f3n de IS_ERR() falle. Esto provocar\u00eda una deferencia ptr NULL en @buffer al acceder a \u00e9l m\u00e1s tarde en smb2_ioctl_query_ioctl(). Mientras tanto, evite tener un @buffer m\u00e1s peque\u00f1o que 8 bytes para manejar correctamente las solicitudes SMB2_SET_INFO FileEndOfFileInformation cuando smb_query_info::flags=PASSTHRU_SET_INFO. Aqu\u00ed hay un peque\u00f1o reproductor de C que activa un ptr NULL en @buffer cuando pasa un smb_query_info::flags no v\u00e1lido #include  #include  #include  #include  #include  #include  #define die(s) perror(s), exit(1) #define QUERY_INFO 0xc018cf07 int main(int argc, char *argv[]) { int fd; if (argc &lt; 2) exit(1); fd = open(argv[1], O_RDONLY); si (fd == -1) morir(\"abrir\"); si (ioctl(fd, QUERY_INFO, (uint32_t[]) { 0, 0, 0, 4, 0, 0}) == -1) morir(\"ioctl\"); cerrar(fd); devolver 0; } mount.cifs //srv/share /mnt -o ... gcc repro.c &amp;&amp; ./a.out /mnt/f0 [ 114.138620] fallo de protecci\u00f3n general, probablemente para direcci\u00f3n no can\u00f3nica 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI [ 114.139310] KASAN: null-ptr-deref en rango [0x000000000000000-0x0000000000000007] [ 114.139775] CPU: 2 PID: 995 Comm: a.out No contaminado 5.17.0-rc8 #1 [ 114.140148] Nombre del hardware: PC est\u00e1ndar QEMU (Q35 + ICH9, 2009), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 01/04/2014 [ 114.140818] RIP: 0010:smb2_ioctl_query_info+0x206/0x410 [cifs] [ 114.141221] C\u00f3digo: 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 c8 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 7b 28 4c 89 fa 48 c1 ea 03 &lt;80&gt; 3c 02 00 0f 85 9c 01 00 00 49 8b 3f e8 58 02 fb ff 48 8b 14 24 [ 114.142348] RSP: 0018:ffffc90000b47b00 EFLAGS: 00010256 [ 114.142692] RAX: dffffc0000000000 RBX: ffff888115503200 RCX: fffffffa020580d [ 114.143119] RDX: 00000000000000000 RSI: 000000000000000004 RDI: fffffffa043a380 [ 114.143544] PBR: ffff888115503278 R08: 0000000000000001 R09: 00000000000000003 [ 114.143983] R10: fffffbfff4087470 R11: 0000000000000001 R12: ffff888115503288 [ 114.144424] R13: 00000000ffffffea R14: ffff888115503228 R15: 0000000000000000 [ 114.144852] FS: 00007f7aeabdf740(0000) GS:ffff888151600000(0000) knlGS:00000000000000000 [ 114.145338] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 114.145692] CR2: 00007f7aeacfdf5e CR3: 000000012000e000 CR4: 0000000000350ee0 [ 114.146131] Seguimiento de llamadas: [ 114.146291]  [ 114.146432] ? smb2_query_reparse_tag+0x890/0x890 [cifs] [ 114.146800] ? cifs_mapchar+0x460/0x460 [cifs] [ 114.147121] ? rcu_read_lock_sched_held+0x3f/0x70 [ 114.147412] ? cifs_strndup_to_utf16+0x15b/0x250 [cifs] [ 114.147775] ? dentry_path_raw+0xa6/0xf0 [ 114.148024] ? cifs_convert_path_to_utf16+0x198/0x220 [cifs] [ 114.148413] ? smb2_check_message+0x1080/0x1080 [cifs] [ 114.148766] ? rcu_read_lock_sched_held+0x3f/0x70 [ 114.149065] cifs_ioctl+0x1577/0x3320 [cifs] [ 114.149371] ? lock_downgrade+0x6f0/0x6f0 [ 114.149631] ? cifs_readdir+0x2e60/0x2e60 [cifs] [ 114.149956] ? rcu_read_lock_sched_held+0x3f/0x70 [ 114.150250] ? __rseq_handle_notify_resume+0x80b/0xbe0 [ 114.150562] ? __up_read+0x192/0x710 [ 114.150791] ? __ia32_sys_rseq+0xf0/0xf0 [ 114.151025] ? __x64_sys_openat+0x11f/0x1d0 [ 114.151296] __x64_sys_ioctl+0x127/0x190 [ 114.151549] do_syscall_64+0x3b/0x90 [ 114.151768] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 114.152079] RIP: 0033:0x7f7aead043df [ 114.152306] C\u00f3digo: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 ---truncado---"
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/7529fbee10d82493c5cb109e51788bf74816d1c0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9963ccea6087268e1275b992dca5d0dd4b938765",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b92e358757b91c2827af112cae9af513f26a3f34",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f143f8334fb9eb2f6c7c15b9da1472d9c965fd84",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fadddfc1dc3c6f79b21cff4a7e9a6c40b84fbc53",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}