CVE-2023-52463
Vulnerability from cvelistv5
Published
2024-02-23 14:46
Modified
2024-11-04 14:47
Severity ?
Summary
efivarfs: force RO when remounting if SetVariable is not supported
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0049fe7e4a85849bdd778cdb72e51a791ff3d737Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0e8d2444168dd519fea501599d150e62718ed2fePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2aa141f8bc580f8f9811dfe4e0e6009812b73826Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/94c742324ed7e42c5bd6a9ed22e4ec6d764db4d8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d4a714873db0866cc471521114eeac4a5072d548Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d4a9aa7db574a0da64307729cc031fb68597aa8bPatch
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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                "id": "CVE-2023-52463",
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                "role": "CISA Coordinator",
                "timestamp": "2024-03-04T20:59:53.029082Z",
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    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nefivarfs: force RO when remounting if SetVariable is not supported\n\nIf SetVariable at runtime is not supported by the firmware we never assign\na callback for that function. At the same time mount the efivarfs as\nRO so no one can call that.  However, we never check the permission flags\nwhen someone remounts the filesystem as RW. As a result this leads to a\ncrash looking like this:\n\n$ mount -o remount,rw /sys/firmware/efi/efivars\n$ efi-updatevar -f PK.auth PK\n\n[  303.279166] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\n[  303.280482] Mem abort info:\n[  303.280854]   ESR = 0x0000000086000004\n[  303.281338]   EC = 0x21: IABT (current EL), IL = 32 bits\n[  303.282016]   SET = 0, FnV = 0\n[  303.282414]   EA = 0, S1PTW = 0\n[  303.282821]   FSC = 0x04: level 0 translation fault\n[  303.283771] user pgtable: 4k pages, 48-bit VAs, pgdp=000000004258c000\n[  303.284913] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000\n[  303.286076] Internal error: Oops: 0000000086000004 [#1] PREEMPT SMP\n[  303.286936] Modules linked in: qrtr tpm_tis tpm_tis_core crct10dif_ce arm_smccc_trng rng_core drm fuse ip_tables x_tables ipv6\n[  303.288586] CPU: 1 PID: 755 Comm: efi-updatevar Not tainted 6.3.0-rc1-00108-gc7d0c4695c68 #1\n[  303.289748] Hardware name: Unknown Unknown Product/Unknown Product, BIOS 2023.04-00627-g88336918701d 04/01/2023\n[  303.291150] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[  303.292123] pc : 0x0\n[  303.292443] lr : efivar_set_variable_locked+0x74/0xec\n[  303.293156] sp : ffff800008673c10\n[  303.293619] x29: ffff800008673c10 x28: ffff0000037e8000 x27: 0000000000000000\n[  303.294592] x26: 0000000000000800 x25: ffff000002467400 x24: 0000000000000027\n[  303.295572] x23: ffffd49ea9832000 x22: ffff0000020c9800 x21: ffff000002467000\n[  303.296566] x20: 0000000000000001 x19: 00000000000007fc x18: 0000000000000000\n[  303.297531] x17: 0000000000000000 x16: 0000000000000000 x15: 0000aaaac807ab54\n[  303.298495] x14: ed37489f673633c0 x13: 71c45c606de13f80 x12: 47464259e219acf4\n[  303.299453] x11: ffff000002af7b01 x10: 0000000000000003 x9 : 0000000000000002\n[  303.300431] x8 : 0000000000000010 x7 : ffffd49ea8973230 x6 : 0000000000a85201\n[  303.301412] x5 : 0000000000000000 x4 : ffff0000020c9800 x3 : 00000000000007fc\n[  303.302370] x2 : 0000000000000027 x1 : ffff000002467400 x0 : ffff000002467000\n[  303.303341] Call trace:\n[  303.303679]  0x0\n[  303.303938]  efivar_entry_set_get_size+0x98/0x16c\n[  303.304585]  efivarfs_file_write+0xd0/0x1a4\n[  303.305148]  vfs_write+0xc4/0x2e4\n[  303.305601]  ksys_write+0x70/0x104\n[  303.306073]  __arm64_sys_write+0x1c/0x28\n[  303.306622]  invoke_syscall+0x48/0x114\n[  303.307156]  el0_svc_common.constprop.0+0x44/0xec\n[  303.307803]  do_el0_svc+0x38/0x98\n[  303.308268]  el0_svc+0x2c/0x84\n[  303.308702]  el0t_64_sync_handler+0xf4/0x120\n[  303.309293]  el0t_64_sync+0x190/0x194\n[  303.309794] Code: ???????? ???????? ???????? ???????? (????????)\n[  303.310612] ---[ end trace 0000000000000000 ]---\n\nFix this by adding a .reconfigure() function to the fs operations which\nwe can use to check the requested flags and deny anything that\u0027s not RO\nif the firmware doesn\u0027t implement SetVariable at runtime."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-11-04T14:47:16.912Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/94c742324ed7e42c5bd6a9ed22e4ec6d764db4d8"
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          "url": "https://git.kernel.org/stable/c/d4a714873db0866cc471521114eeac4a5072d548"
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        {
          "url": "https://git.kernel.org/stable/c/0e8d2444168dd519fea501599d150e62718ed2fe"
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      ],
      "title": "efivarfs: force RO when remounting if SetVariable is not supported",
      "x_generator": {
        "engine": "bippy-9e1c9544281a"
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-52463",
    "datePublished": "2024-02-23T14:46:23.537Z",
    "dateReserved": "2024-02-20T12:30:33.296Z",
    "dateUpdated": "2024-11-04T14:47:16.912Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52463\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-23T15:15:08.590\",\"lastModified\":\"2024-11-04T13:16:31.973\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nefivarfs: force RO when remounting if SetVariable is not supported\\n\\nIf SetVariable at runtime is not supported by the firmware we never assign\\na callback for that function. At the same time mount the efivarfs as\\nRO so no one can call that.  However, we never check the permission flags\\nwhen someone remounts the filesystem as RW. As a result this leads to a\\ncrash looking like this:\\n\\n$ mount -o remount,rw /sys/firmware/efi/efivars\\n$ efi-updatevar -f PK.auth PK\\n\\n[  303.279166] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\\n[  303.280482] Mem abort info:\\n[  303.280854]   ESR = 0x0000000086000004\\n[  303.281338]   EC = 0x21: IABT (current EL), IL = 32 bits\\n[  303.282016]   SET = 0, FnV = 0\\n[  303.282414]   EA = 0, S1PTW = 0\\n[  303.282821]   FSC = 0x04: level 0 translation fault\\n[  303.283771] user pgtable: 4k pages, 48-bit VAs, pgdp=000000004258c000\\n[  303.284913] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000\\n[  303.286076] Internal error: Oops: 0000000086000004 [#1] PREEMPT SMP\\n[  303.286936] Modules linked in: qrtr tpm_tis tpm_tis_core crct10dif_ce arm_smccc_trng rng_core drm fuse ip_tables x_tables ipv6\\n[  303.288586] CPU: 1 PID: 755 Comm: efi-updatevar Not tainted 6.3.0-rc1-00108-gc7d0c4695c68 #1\\n[  303.289748] Hardware name: Unknown Unknown Product/Unknown Product, BIOS 2023.04-00627-g88336918701d 04/01/2023\\n[  303.291150] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\\n[  303.292123] pc : 0x0\\n[  303.292443] lr : efivar_set_variable_locked+0x74/0xec\\n[  303.293156] sp : ffff800008673c10\\n[  303.293619] x29: ffff800008673c10 x28: ffff0000037e8000 x27: 0000000000000000\\n[  303.294592] x26: 0000000000000800 x25: ffff000002467400 x24: 0000000000000027\\n[  303.295572] x23: ffffd49ea9832000 x22: ffff0000020c9800 x21: ffff000002467000\\n[  303.296566] x20: 0000000000000001 x19: 00000000000007fc x18: 0000000000000000\\n[  303.297531] x17: 0000000000000000 x16: 0000000000000000 x15: 0000aaaac807ab54\\n[  303.298495] x14: ed37489f673633c0 x13: 71c45c606de13f80 x12: 47464259e219acf4\\n[  303.299453] x11: ffff000002af7b01 x10: 0000000000000003 x9 : 0000000000000002\\n[  303.300431] x8 : 0000000000000010 x7 : ffffd49ea8973230 x6 : 0000000000a85201\\n[  303.301412] x5 : 0000000000000000 x4 : ffff0000020c9800 x3 : 00000000000007fc\\n[  303.302370] x2 : 0000000000000027 x1 : ffff000002467400 x0 : ffff000002467000\\n[  303.303341] Call trace:\\n[  303.303679]  0x0\\n[  303.303938]  efivar_entry_set_get_size+0x98/0x16c\\n[  303.304585]  efivarfs_file_write+0xd0/0x1a4\\n[  303.305148]  vfs_write+0xc4/0x2e4\\n[  303.305601]  ksys_write+0x70/0x104\\n[  303.306073]  __arm64_sys_write+0x1c/0x28\\n[  303.306622]  invoke_syscall+0x48/0x114\\n[  303.307156]  el0_svc_common.constprop.0+0x44/0xec\\n[  303.307803]  do_el0_svc+0x38/0x98\\n[  303.308268]  el0_svc+0x2c/0x84\\n[  303.308702]  el0t_64_sync_handler+0xf4/0x120\\n[  303.309293]  el0t_64_sync+0x190/0x194\\n[  303.309794] Code: ???????? ???????? ???????? ???????? (????????)\\n[  303.310612] ---[ end trace 0000000000000000 ]---\\n\\nFix this by adding a .reconfigure() function to the fs operations which\\nwe can use to check the requested flags and deny anything that\u0027s not RO\\nif the firmware doesn\u0027t implement SetVariable at runtime.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: efivarfs: fuerza RO al volver a montar si SetVariable no es compatible. Si SetVariable en tiempo de ejecuci\u00f3n no es compatible con el firmware, nunca asignamos una devoluci\u00f3n de llamada para esa funci\u00f3n. Al mismo tiempo, monte los efivarfs como RO para que nadie pueda llamarlo. Sin embargo, nunca verificamos los indicadores de permiso cuando alguien vuelve a montar el sistema de archivos como RW. Como resultado, esto provoca un bloqueo similar al siguiente: $ mount -o remount,rw /sys/firmware/efi/efivars $ efi-updatevar -f PK.auth PK [303.279166] No se puede manejar la desreferencia del puntero NULL del kernel en la direcci\u00f3n virtual 0000000000000000 [ 303.280482] Informaci\u00f3n de cancelaci\u00f3n de memoria: [ 303.280854] ESR = 0x0000000086000004 [ 303.281338] EC = 0x21: IABT (EL actual), IL = 32 bits [ 303.282016] SET = 0, F nV = 0 [ 303.282414] EA = 0, S1PTW = 0 [ 303.282821] FSC = 0x04: error de traducci\u00f3n de nivel 0 [ 303.283771] tabla de p\u00e1ginas de usuario: p\u00e1ginas 4k, VA de 48 bits, pgdp=000000004258c000 [ 303.284913] [0000000000000000] pgd=00000000 00000000, p4d=00000000000000000 [303.286076] Error interno: Ups: 0000000086000004 [#1] PREEMPT SMP [ 303.286936] M\u00f3dulos vinculados en: qrtr tpm_tis tpm_tis_core crct10dif_ce arm_smccc_trng rng_core drm fuse ip_tables x_tables ipv6 [ 303.288586] CPU: 1 PID: 755 Comm: efi- updatevar No contaminado 6.3.0-rc1-00108-gc7d0c4695c68 #1 [303.289748] Nombre de hardware: Desconocido Producto desconocido/Producto desconocido, BIOS 2023.04-00627-g88336918701d 01/04/2023 [303.291150] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [303.292123] pc: 0x0 [303.292443] lr: efivar_set_variable_locked+0x74/0xec [303.293156] sp: ffff800008673c10 [303.293619] x29: ffff800008673c10 x28: ffff 0000037e8000 x27: 0000000000000000 [ 303.294592] x26: 0000000000000800 x25: ffff000002467400 x24: 0000000000000027 [ 303.295572] x23 : ffffd49ea9832000 x22: ffff0000020c9800 x21: ffff000002467000 [ 303.296566] x20: 00000000000000001 x19: 000000000000007fc x18: 00000000000 00000 [ 303.297531] x17: 0000000000000000 x16: 0000000000000000 x15: 0000aaaac807ab54 [ 303.298495] x14: ed37489f673633c0 x13: 71c45c60 6de13f80 x12: 47464259e219acf4 [ 303.299453] x11: ffff000002af7b01 x10: 0000000000000003 x9: 0000000000000002 [303.300431] x8: 0000000000000010 x7: ffffd49ea8973230 x6: 0000000000a85201 [303.301412] x5: 0000000000000000 x4: ffff0000020c9800 x3: 00000000000007fc [303.302370] x2: 00000000000000027 x1: ffff000002467400 x0: ffff0000024670 00 [ 303.303341] Rastreo de llamadas: [ 303.303679 ] 0x0 [ 303.303938] efivar_entry_set_get_size+0x98/0x16c [ 303.304585] efivarfs_file_write+0xd0/0x1a4 [ 303.305148] vfs_write+0xc4/0x2e4 [ 303.305601] ksys_write+ 0x70/0x104 [ 303.306073] __arm64_sys_write+0x1c/0x28 [ 303.306622] invoke_syscall+0x48/0x114 [ 303.307156] el0_svc_common.constprop.0+0x44/0xec [ 303.307803] do_el0_svc+0x38/0x98 [ 303.308268] el0_svc+0x2c/0x84 [ 303.308702] el0t_64_sync_handler+0x f4/0x120 [303.309293] el0t_64_sync+0x190/0x194 [303.309794] C\u00f3digo:? ??????? ??????? ??????? ??????? (??????????) [ 303.310612] ---[ end trace 0000000000000000 ]--- Solucione este problema agregando una funci\u00f3n .reconfigure() a las operaciones fs que podemos usar para verificar los indicadores solicitados y negar cualquier cosa eso no es RO si el firmware no implementa SetVariable en tiempo de ejecuci\u00f3n.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.8.0\",\"versionEndExcluding\":\"5.10.209\",\"matchCriteriaId\":\"7A15A248-31E4-43F5-BBA0-FC90B42A1823\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11.0\",\"versionEndExcluding\":\"5.15.148\",\"matchCriteriaId\":\"E25E1389-4B0F-407A-9C94-5908FF3EE88B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16.0\",\"versionEndExcluding\":\"6.1.75\",\"matchCriteriaId\":\"2C4951FA-80C0-4B4C-9836-6E5035DEB0F9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2.0\",\"versionEndExcluding\":\"6.6.14\",\"matchCriteriaId\":\"BDBBEB0E-D13A-4567-8984-51C5375350B9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7.0\",\"versionEndExcluding\":\"6.7.2\",\"matchCriteriaId\":\"0EA3778C-730B-464C-8023-18CA6AC0B807\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0049fe7e4a85849bdd778cdb72e51a791ff3d737\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0e8d2444168dd519fea501599d150e62718ed2fe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2aa141f8bc580f8f9811dfe4e0e6009812b73826\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/94c742324ed7e42c5bd6a9ed22e4ec6d764db4d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d4a714873db0866cc471521114eeac4a5072d548\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d4a9aa7db574a0da64307729cc031fb68597aa8b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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