CVE-2023-52885

{"id": "CVE-2023-52885", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2024-07-14T08:15:01.823", "references": [{"url": "https://git.kernel.org/stable/c/42725e5c1b181b757ba11d804443922982334d9b", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/7e1f989055622fd086c5dfb291fc72adf5660b6f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c7b8c2d06e437639694abe76978e915cfb73f428", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/cd5ec3ee52ce4b7e283cc11facfa420c297c8065", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/dfc896c4a75cb8cd7cb2dfd9b469cf1e3f004254", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ef047411887ff0845afd642d6a687819308e1a4e", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fbf4ace39b2e4f3833236afbb2336edbafd75eee", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fc80fc2d4e39137869da3150ee169b40bf879287", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: Fix UAF in svc_tcp_listen_data_ready()\n\nAfter the listener svc_sock is freed, and before invoking svc_tcp_accept()\nfor the established child sock, there is a window that the newsock\nretaining a freed listener svc_sock in sk_user_data which cloning from\nparent. In the race window, if data is received on the newsock, we will\nobserve use-after-free report in svc_tcp_listen_data_ready().\n\nReproduce by two tasks:\n\n1. while :; do rpc.nfsd 0 ; rpc.nfsd; done\n2. while :; do echo \"\" | ncat -4 127.0.0.1 2049 ; done\n\nKASAN report:\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in svc_tcp_listen_data_ready+0x1cf/0x1f0 [sunrpc]\n Read of size 8 at addr ffff888139d96228 by task nc/102553\n CPU: 7 PID: 102553 Comm: nc Not tainted 6.3.0+ #18\n Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020\n Call Trace:\n <IRQ>\n dump_stack_lvl+0x33/0x50\n print_address_description.constprop.0+0x27/0x310\n print_report+0x3e/0x70\n kasan_report+0xae/0xe0\n svc_tcp_listen_data_ready+0x1cf/0x1f0 [sunrpc]\n tcp_data_queue+0x9f4/0x20e0\n tcp_rcv_established+0x666/0x1f60\n tcp_v4_do_rcv+0x51c/0x850\n tcp_v4_rcv+0x23fc/0x2e80\n ip_protocol_deliver_rcu+0x62/0x300\n ip_local_deliver_finish+0x267/0x350\n ip_local_deliver+0x18b/0x2d0\n ip_rcv+0x2fb/0x370\n __netif_receive_skb_one_core+0x166/0x1b0\n process_backlog+0x24c/0x5e0\n __napi_poll+0xa2/0x500\n net_rx_action+0x854/0xc90\n __do_softirq+0x1bb/0x5de\n do_softirq+0xcb/0x100\n </IRQ>\n <TASK>\n ...\n </TASK>\n\n Allocated by task 102371:\n kasan_save_stack+0x1e/0x40\n kasan_set_track+0x21/0x30\n __kasan_kmalloc+0x7b/0x90\n svc_setup_socket+0x52/0x4f0 [sunrpc]\n svc_addsock+0x20d/0x400 [sunrpc]\n __write_ports_addfd+0x209/0x390 [nfsd]\n write_ports+0x239/0x2c0 [nfsd]\n nfsctl_transaction_write+0xac/0x110 [nfsd]\n vfs_write+0x1c3/0xae0\n ksys_write+0xed/0x1c0\n do_syscall_64+0x38/0x90\n entry_SYSCALL_64_after_hwframe+0x72/0xdc\n\n Freed by task 102551:\n kasan_save_stack+0x1e/0x40\n kasan_set_track+0x21/0x30\n kasan_save_free_info+0x2a/0x50\n __kasan_slab_free+0x106/0x190\n __kmem_cache_free+0x133/0x270\n svc_xprt_free+0x1e2/0x350 [sunrpc]\n svc_xprt_destroy_all+0x25a/0x440 [sunrpc]\n nfsd_put+0x125/0x240 [nfsd]\n nfsd_svc+0x2cb/0x3c0 [nfsd]\n write_threads+0x1ac/0x2a0 [nfsd]\n nfsctl_transaction_write+0xac/0x110 [nfsd]\n vfs_write+0x1c3/0xae0\n ksys_write+0xed/0x1c0\n do_syscall_64+0x38/0x90\n entry_SYSCALL_64_after_hwframe+0x72/0xdc\n\nFix the UAF by simply doing nothing in svc_tcp_listen_data_ready()\nif state != TCP_LISTEN, that will avoid dereferencing svsk for all\nchild socket."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: SUNRPC: corrige UAF en svc_tcp_listen_data_ready() Despu\u00e9s de que se libera el oyente svc_sock, y antes de invocar svc_tcp_accept() para el calcet\u00edn secundario establecido, hay una ventana que indica que el newsock retiene un oyente liberado. svc_sock en sk_user_data que clona desde el padre. En la ventana de ejecuci\u00f3n, si se reciben datos en el newsock, observaremos el informe de use-after-free en svc_tcp_listen_data_ready(). Reproducir mediante dos tareas: 1. while:; hacer rpc.nfsd 0; rpc.nfsd; hecho 2. mientras:; hacer eco \"\" | ncat -4 127.0.0.1 2049; Informe KASAN hecho: ================================================= ==================== ERROR: KASAN: slab-use-after-free en svc_tcp_listen_data_ready+0x1cf/0x1f0 [sunrpc] Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff888139d96228 por tarea nc /102553 CPU: 7 PID: 102553 Comm: nc Not tainted 6.3.0+ #18 Nombre de hardware: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 12/11/2020 Seguimiento de llamadas: dump_stack_lvl+ 0x33/0x50 print_address_description.constprop.0+0x27/0x310 print_report+0x3e/0x70 kasan_report+0xae/0xe0 svc_tcp_listen_data_ready+0x1cf/0x1f0 [sunrpc] tcp_data_queue+0x9f4/0x20e0 tcp_rcv_ establecido+0x666/0x1f60 tcp_v4_do_rcv+0x51c/0x850 tcp_v4_rcv+0x23fc/0x2e80 ip_protocol_deliver_rcu+0x62/0x300 ip_local_deliver_finish+0x267/0x350 ip_local_deliver+0x18b/0x2d0 ip_rcv+0x2fb/0x370 __netif_receive_skb_one_core+0x166/0x1b0 Process_backlog+0x24c/0x5e 0 __napi_poll+0xa2/0x500 net_rx_action+0x854/0xc90 __do_softirq+0x1bb/0x5de do_softirq+0xcb/0x100 ... Asignado por la tarea 102371: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_kmalloc+0x7b/0x90 svc_setup_socket+0x52/0x4f0 [sunrpc] 0x400 [sunrpc] __write_ports_addfd+0x209/0x390 [nfsd] write_ports+0x239/0x2c0 [nfsd] nfsctl_transaction_write+0xac/0x110 [nfsd] vfs_write+0x1c3/0xae0 ksys_write+0xed/0x1c0 do_syscall_64+0x3 8/0x90 Entry_SYSCALL_64_after_hwframe+0x72/0xdc Liberado por la tarea 102551: kasan_save_stack +0x1e/0x40 kasan_set_track+0x21/0x30 kasan_save_free_info+0x2a/0x50 __kasan_slab_free+0x106/0x190 __kmem_cache_free+0x133/0x270 svc_xprt_free+0x1e2/0x350 [sunrpc] _destroy_all+0x25a/0x440 [sunrpc] nfsd_put+0x125/0x240 [nfsd] nfsd_svc+ 0x2cb/0x3c0 [nfsd] write_threads+0x1ac/0x2a0 [nfsd] nfsctl_transaction_write+0xac/0x110 [nfsd] vfs_write+0x1c3/0xae0 ksys_write+0xed/0x1c0 do_syscall_64+0x38/0x90 entrada_SYSCALL_ 64_after_hwframe+0x72/0xdc Arregle el UAF simplemente sin hacer nada en svc_tcp_listen_data_ready() si state!= TCP_LISTEN, eso evitar\u00e1 desreferenciar svsk para todos los sockets secundarios."}], "lastModified": "2024-08-21T17:03:01.107", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EA304272-C8A2-45E1-8E51-A4EAB3581183", "versionEndExcluding": "4.14.322", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D2D2CA9F-4CC4-4AF5-8C6D-E58415AB782E", "versionEndExcluding": "4.19.291", "versionStartIncluding": "4.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7FA663C4-CA72-4B5A-8592-7354D978F58E", "versionEndExcluding": "5.4.251", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "43CAE50A-4A6C-488E-813C-F8DB77C13C8B", "versionEndExcluding": "5.10.188", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EC77775B-EC31-4966-966C-1286C02B2A85", "versionEndExcluding": "5.15.121", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9BD1D4A1-304D-4187-8178-6D7C0050B1AF", "versionEndExcluding": "6.1.39", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A91BC267-63EE-413E-A6EF-6B96C2A278D1", "versionEndExcluding": "6.4.4", "versionStartIncluding": "6.2"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}