356 lines
21 KiB
JSON
356 lines
21 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveId": "CVE-2023-52478",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-20T12:30:33.298Z",
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"datePublished": "2024-02-29T05:43:10.698Z",
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"dateUpdated": "2026-08-05T09:10:08.517Z"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: logitech-hidpp: Fix kernel crash on receiver USB disconnect\n\nhidpp_connect_event() has *four* time-of-check vs time-of-use (TOCTOU)\nraces when it races with itself.\n\nhidpp_connect_event() primarily runs from a workqueue but it also runs\non probe() and if a \"device-connected\" packet is received by the hw\nwhen the thread running hidpp_connect_event() from probe() is waiting on\nthe hw, then a second thread running hidpp_connect_event() will be\nstarted from the workqueue.\n\nThis opens the following races (note the below code is simplified):\n\n1. Retrieving + printing the protocol (harmless race):\n\n\tif (!hidpp->protocol_major) {\n\t\thidpp_root_get_protocol_version()\n\t\thidpp->protocol_major = response.rap.params[0];\n\t}\n\nWe can actually see this race hit in the dmesg in the abrt output\nattached to rhbz#2227968:\n\n[ 3064.624215] logitech-hidpp-device 0003:046D:4071.0049: HID++ 4.5 device connected.\n[ 3064.658184] logitech-hidpp-device 0003:046D:4071.0049: HID++ 4.5 device connected.\n\nTesting with extra logging added has shown that after this the 2 threads\ntake turn grabbing the hw access mutex (send_mutex) so they ping-pong\nthrough all the other TOCTOU cases managing to hit all of them:\n\n2. Updating the name to the HIDPP name (harmless race):\n\n\tif (hidpp->name == hdev->name) {\n\t\t...\n\t\thidpp->name = new_name;\n\t}\n\n3. Initializing the power_supply class for the battery (problematic!):\n\nhidpp_initialize_battery()\n{\n if (hidpp->battery.ps)\n return 0;\n\n\tprobe_battery(); /* Blocks, threads take turns executing this */\n\n\thidpp->battery.desc.properties =\n\t\tdevm_kmemdup(dev, hidpp_battery_props, cnt, GFP_KERNEL);\n\n\thidpp->battery.ps =\n\t\tdevm_power_supply_register(&hidpp->hid_dev->dev,\n\t\t\t\t\t &hidpp->battery.desc, cfg);\n}\n\n4. Creating delayed input_device (potentially problematic):\n\n\tif (hidpp->delayed_input)\n\t\treturn;\n\n\thidpp->delayed_input = hidpp_allocate_input(hdev);\n\nThe really big problem here is 3. Hitting the race leads to the following\nsequence:\n\n\thidpp->battery.desc.properties =\n\t\tdevm_kmemdup(dev, hidpp_battery_props, cnt, GFP_KERNEL);\n\n\thidpp->battery.ps =\n\t\tdevm_power_supply_register(&hidpp->hid_dev->dev,\n\t\t\t\t\t &hidpp->battery.desc, cfg);\n\n\t...\n\n\thidpp->battery.desc.properties =\n\t\tdevm_kmemdup(dev, hidpp_battery_props, cnt, GFP_KERNEL);\n\n\thidpp->battery.ps =\n\t\tdevm_power_supply_register(&hidpp->hid_dev->dev,\n\t\t\t\t\t &hidpp->battery.desc, cfg);\n\nSo now we have registered 2 power supplies for the same battery,\nwhich looks a bit weird from userspace's pov but this is not even\nthe really big problem.\n\nNotice how:\n\n1. This is all devm-maganaged\n2. The hidpp->battery.desc struct is shared between the 2 power supplies\n3. hidpp->battery.desc.properties points to the result from the second\n devm_kmemdup()\n\nThis causes a use after free scenario on USB disconnect of the receiver:\n1. The last registered power supply class device gets unregistered\n2. The memory from the last devm_kmemdup() call gets freed,\n hidpp->battery.desc.properties now points to freed memory\n3. The first registered power supply class device gets unregistered,\n this involves sending a remove uevent to userspace which invokes\n power_supply_uevent() to fill the uevent data\n4. power_supply_uevent() uses hidpp->battery.desc.properties which\n now points to freed memory leading to backtraces like this one:\n\nSep 22 20:01:35 eric kernel: BUG: unable to handle page fault for address: ffffb2140e017f08\n...\nSep 22 20:01:35 eric kernel: Workqueue: usb_hub_wq hub_event\nSep 22 20:01:35 eric kernel: RIP: 0010:power_supply_uevent+0xee/0x1d0\n...\nSep 22 20:01:35 eric kernel: ? asm_exc_page_fault+0x26/0x30\nSep 22 20:01:35 eric kernel: ? power_supply_uevent+0xee/0x1d0\nSep 22 20:01:35 eric kernel: ? power_supply_uevent+0x10d/0x1d0\nSep 22 20:01:35 eric kernel: dev_uevent+0x10f/0x2d0\nSep 22 20:01:35 eric kernel: kobject_uevent_env+0x291/0x680\nSep 22 20:01:35 eric kernel: \n---truncated---"
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"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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"value": "AV:A - The logitech-hidpp driver binds Bluetooth HID++ devices and Unifying/DJ wireless children; an adjacent attacker with a malicious Logitech-compatible BT or Unifying RF device can cause probe (race) and destroy/unpair (UAF) without physical USB access.\nAC:L - A malicious HID++ device can send connect events while probe’s hidpp_connect_event() blocks on hardware I/O, creating both sides of the race; the race has also been hit repeatedly in the wild with real Logitech hardware.\nPR:N - Exploitation is via wireless HID/Unifying traffic to an already-present receiver or Bluetooth adapter and requires no OS account or capabilities.\nUI:N - Pairing/connect and unpair/disconnect can be driven by the attacker’s peripheral (or auto-reconnect paths) without requiring a separate victim action such as mounting a volume or confirming a prompt.\nS:U - Impact is confined to the host kernel’s HID/power_supply authority; this is not a VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - The bug is a use-after-free of battery.desc.properties consumed by power_supply_uevent(); UAF of that array can disclose freed heap contents and, via OOB property indices, adjacent kernel data into uevents.\nI:H - UAF of the properties array enables heap-spray control of property enums used in set_bit() and power_supply_attrs lookups during uevent, yielding memory-corruption primitives suitable for integrity compromise/control-flow hijacking.\nA:H - The UAF reliably causes kernel oops/page faults during power_supply_unregister on disconnect, as shown in the documented crash traces."
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