mirror of
https://github.com/fkie-cad/nvd-json-data-feeds.git
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88 lines
8.4 KiB
JSON
88 lines
8.4 KiB
JSON
{
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"id": "CVE-2022-49287",
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"published": "2025-02-26T07:01:05.557",
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"lastModified": "2025-02-27T19:15:42.893",
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"vulnStatus": "Awaiting Analysis",
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"cveTags": [],
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntpm: fix reference counting for struct tpm_chip\n\nThe following sequence of operations results in a refcount warning:\n\n1. Open device /dev/tpmrm.\n2. Remove module tpm_tis_spi.\n3. Write a TPM command to the file descriptor opened at step 1.\n\n------------[ cut here ]------------\nWARNING: CPU: 3 PID: 1161 at lib/refcount.c:25 kobject_get+0xa0/0xa4\nrefcount_t: addition on 0; use-after-free.\nModules linked in: tpm_tis_spi tpm_tis_core tpm mdio_bcm_unimac brcmfmac\nsha256_generic libsha256 sha256_arm hci_uart btbcm bluetooth cfg80211 vc4\nbrcmutil ecdh_generic ecc snd_soc_core crc32_arm_ce libaes\nraspberrypi_hwmon ac97_bus snd_pcm_dmaengine bcm2711_thermal snd_pcm\nsnd_timer genet snd phy_generic soundcore [last unloaded: spi_bcm2835]\nCPU: 3 PID: 1161 Comm: hold_open Not tainted 5.10.0ls-main-dirty #2\nHardware name: BCM2711\n[<c0410c3c>] (unwind_backtrace) from [<c040b580>] (show_stack+0x10/0x14)\n[<c040b580>] (show_stack) from [<c1092174>] (dump_stack+0xc4/0xd8)\n[<c1092174>] (dump_stack) from [<c0445a30>] (__warn+0x104/0x108)\n[<c0445a30>] (__warn) from [<c0445aa8>] (warn_slowpath_fmt+0x74/0xb8)\n[<c0445aa8>] (warn_slowpath_fmt) from [<c08435d0>] (kobject_get+0xa0/0xa4)\n[<c08435d0>] (kobject_get) from [<bf0a715c>] (tpm_try_get_ops+0x14/0x54 [tpm])\n[<bf0a715c>] (tpm_try_get_ops [tpm]) from [<bf0a7d6c>] (tpm_common_write+0x38/0x60 [tpm])\n[<bf0a7d6c>] (tpm_common_write [tpm]) from [<c05a7ac0>] (vfs_write+0xc4/0x3c0)\n[<c05a7ac0>] (vfs_write) from [<c05a7ee4>] (ksys_write+0x58/0xcc)\n[<c05a7ee4>] (ksys_write) from [<c04001a0>] (ret_fast_syscall+0x0/0x4c)\nException stack(0xc226bfa8 to 0xc226bff0)\nbfa0: 00000000 000105b4 00000003 beafe664 00000014 00000000\nbfc0: 00000000 000105b4 000103f8 00000004 00000000 00000000 b6f9c000 beafe684\nbfe0: 0000006c beafe648 0001056c b6eb6944\n---[ end trace d4b8409def9b8b1f ]---\n\nThe reason for this warning is the attempt to get the chip->dev reference\nin tpm_common_write() although the reference counter is already zero.\n\nSince commit 8979b02aaf1d (\"tpm: Fix reference count to main device\") the\nextra reference used to prevent a premature zero counter is never taken,\nbecause the required TPM_CHIP_FLAG_TPM2 flag is never set.\n\nFix this by moving the TPM 2 character device handling from\ntpm_chip_alloc() to tpm_add_char_device() which is called at a later point\nin time when the flag has been set in case of TPM2.\n\nCommit fdc915f7f719 (\"tpm: expose spaces via a device link /dev/tpmrm<n>\")\nalready introduced function tpm_devs_release() to release the extra\nreference but did not implement the required put on chip->devs that results\nin the call of this function.\n\nFix this by putting chip->devs in tpm_chip_unregister().\n\nFinally move the new implementation for the TPM 2 handling into a new\nfunction to avoid multiple checks for the TPM_CHIP_FLAG_TPM2 flag in the\ngood case and error cases."
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},
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{
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"lang": "es",
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tpm: arreglo del recuento de referencias para struct tpm_chip La siguiente secuencia de operaciones genera una advertencia de recuento de referencias: 1. Abra el dispositivo /dev/tpmrm. 2. Elimine el m\u00f3dulo tpm_tis_spi. 3. Escriba un comando TPM en el descriptor de archivo abierto en el paso 1. ------------[ cortar aqu\u00ed ]------------ ADVERTENCIA: CPU: 3 PID: 1161 en lib/refcount.c:25 kobject_get+0xa0/0xa4 refcount_t: adici\u00f3n en 0; use-after-free. M\u00f3dulos vinculados en: tpm_tis_spi tpm_tis_core tpm mdio_bcm_unimac brcmfmac sha256_generic libsha256 sha256_arm hci_uart btbcm bluetooth cfg80211 vc4 brcmutil ecdh_generic ecc snd_soc_core crc32_arm_ce libaes raspberrypi_hwmon ac97_bus snd_pcm_dmaengine bcm2711_thermal snd_pcm snd_timer genet snd phy_generic soundcore [\u00faltima descarga: spi_bcm2835] CPU: 3 PID: 1161 Comm: hold_open No contaminado 5.10.0ls-main-dirty #2 Nombre del hardware: BCM2711 [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [] (show_stack) desde [] (dump_stack+0xc4/0xd8) [] (dump_stack) from [] (__warn+0x104/0x108) [] (__warn) from [] (warn_slowpath_fmt+0x74/0xb8) [] (warn_slowpath_fmt) from [] (kobject_get+0xa0/0xa4) [] (kobject_get) desde [] (tpm_try_get_ops+0x14/0x54 [tpm]) [] (tpm_try_get_ops [tpm]) desde[] (tpm_common_write+0x38/0x60 [tpm]) [] (tpm_common_write [tpm]) desde[] (vfs_write+0xc4/0x3c0) [] (vfs_write) desde[] (ksys_write+0x58/0xcc) [] (ksys_write) desde[] (ret_fast_syscall+0x0/0x4c) Pila de excepciones (0xc226bfa8 a 0xc226bff0) bfa0: 00000000 000105b4 00000003 beafe664 00000014 00000000 bfc0: 00000000 000105b4 000103f8 00000004 00000000 00000000 b6f9c000 beafe684 bfe0: 0000006c beafe648 0001056c b6eb6944 ---[ fin del seguimiento d4b8409def9b8b1f ]--- El motivo de esta advertencia es el intento de obtener el chip->dev referencia en tpm_common_write() aunque el contador de referencia ya es cero. Desde el commit 8979b02aaf1d (\"tpm: Fix reference count to main device\") la referencia adicional utilizada para evitar un contador cero prematuro nunca se toma, porque el indicador TPM_CHIP_FLAG_TPM2 requerido nunca se establece. Corrija esto moviendo la gesti\u00f3n del dispositivo de caracteres TPM 2 de tpm_chip_alloc() a tpm_add_char_device() que se llama en un punto posterior en el tiempo cuando el indicador se ha establecido en el caso de TPM2. el commit fdc915f7f719 (\"tpm: exponer espacios a trav\u00e9s de un enlace de dispositivo /dev/tpmrm\") ya introdujo la funci\u00f3n tpm_devs_release() para liberar la referencia adicional pero no implement\u00f3 la funci\u00f3n put en chip->devs requerida que da como resultado la llamada de esta funci\u00f3n. Corrija esto colocando chip->devs en tpm_chip_unregister(). Finalmente, mueva la nueva implementaci\u00f3n para la gesti\u00f3n de TPM 2 a una nueva funci\u00f3n para evitar m\u00faltiples verificaciones del indicador TPM_CHIP_FLAG_TPM2 en los casos buenos y de error."
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}
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],
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"metrics": {
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"cvssMetricV31": [
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{
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"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"type": "Secondary",
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"cvssData": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH",
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"attackVector": "LOCAL",
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"attackComplexity": "LOW",
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"privilegesRequired": "LOW",
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"userInteraction": "NONE",
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"scope": "UNCHANGED",
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"confidentialityImpact": "HIGH",
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"integrityImpact": "HIGH",
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"availabilityImpact": "HIGH"
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},
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"exploitabilityScore": 1.8,
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"impactScore": 5.9
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}
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]
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},
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"weaknesses": [
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{
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"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"type": "Secondary",
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"description": [
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{
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"lang": "en",
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"value": "CWE-416"
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/290e05f346d1829e849662c97e42d5ad984f5258",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/2f928c0d5c02dbab49e8c19d98725c822f6fc409",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/473a66f99cb8173c14138c5a5c69bfad04e8f9ac",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/662893b4f6bd466ff9e1cd454c44c26d32d554fe",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/6e7baf84149fb43950631415de231b3a41915aa3",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/7e0438f83dc769465ee663bb5dcf8cc154940712",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/a27ed2f3695baf15f9b34d2d7a1f9fc105539a81",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/cb64bd038beacb4331fe464a36c8b5481e8f51e2",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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}
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]
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} |