{"vulnerability": "CVE-2023-52885", "sightings": [{"uuid": "f52e7372-7380-4334-ad0e-8900ace5f4b8", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2023-52885", "type": "seen", "source": "https://t.me/cvedetector/816", "content": "{\n  \"Source\": \"CVE FEED\",\n  \"Title\": \"CVE-2023-52885 - In the Linux kernel, the following vulnerability h\", \n  \"Content\": \"CVE ID : CVE-2023-52885 \nPublished : July 14, 2024, 8:15 a.m. | 22\u00a0minutes ago \nDescription : 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     \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     \n     \n   ...  \n     \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. \nSeverity: 0.0 | NA \nVisit the link for more details, such as CVSS details, affected products, timeline, and more...\",\n  \"Detection Date\": \"14 Jul 2024\",\n  \"Type\": \"Vulnerability\"\n}\n\ud83d\udd39 t.me/cvedetector \ud83d\udd39", "creation_timestamp": "2024-07-14T10:45:04.000000Z"}]}