cve-2021-47068
Vulnerability from cvelistv5
Published
2024-02-29 22:37
Modified
2024-11-04 11:58
Severity ?
Summary
net/nfc: fix use-after-free llcp_sock_bind/connect
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website


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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/nfc: fix use-after-free llcp_sock_bind/connect\n\nCommits 8a4cd82d (\"nfc: fix refcount leak in llcp_sock_connect()\")\nand c33b1cc62 (\"nfc: fix refcount leak in llcp_sock_bind()\")\nfixed a refcount leak bug in bind/connect but introduced a\nuse-after-free if the same local is assigned to 2 different sockets.\n\nThis can be triggered by the following simple program:\n    int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );\n    int sock2 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );\n    memset( \u0026addr, 0, sizeof(struct sockaddr_nfc_llcp) );\n    addr.sa_family = AF_NFC;\n    addr.nfc_protocol = NFC_PROTO_NFC_DEP;\n    bind( sock1, (struct sockaddr*) \u0026addr, sizeof(struct sockaddr_nfc_llcp) )\n    bind( sock2, (struct sockaddr*) \u0026addr, sizeof(struct sockaddr_nfc_llcp) )\n    close(sock1);\n    close(sock2);\n\nFix this by assigning NULL to llcp_sock-\u003elocal after calling\nnfc_llcp_local_put.\n\nThis addresses CVE-2021-23134."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47068",
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    "dateReserved": "2024-02-29T22:33:44.296Z",
    "dateUpdated": "2024-11-04T11:58:48.859Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47068\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-29T23:15:08.170\",\"lastModified\":\"2024-03-01T14:04:26.010\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/nfc: fix use-after-free llcp_sock_bind/connect\\n\\nCommits 8a4cd82d (\\\"nfc: fix refcount leak in llcp_sock_connect()\\\")\\nand c33b1cc62 (\\\"nfc: fix refcount leak in llcp_sock_bind()\\\")\\nfixed a refcount leak bug in bind/connect but introduced a\\nuse-after-free if the same local is assigned to 2 different sockets.\\n\\nThis can be triggered by the following simple program:\\n    int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );\\n    int sock2 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );\\n    memset( \u0026addr, 0, sizeof(struct sockaddr_nfc_llcp) );\\n    addr.sa_family = AF_NFC;\\n    addr.nfc_protocol = NFC_PROTO_NFC_DEP;\\n    bind( sock1, (struct sockaddr*) \u0026addr, sizeof(struct sockaddr_nfc_llcp) )\\n    bind( sock2, (struct sockaddr*) \u0026addr, sizeof(struct sockaddr_nfc_llcp) )\\n    close(sock1);\\n    close(sock2);\\n\\nFix this by assigning NULL to llcp_sock-\u003elocal after calling\\nnfc_llcp_local_put.\\n\\nThis addresses CVE-2021-23134.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/nfc: corrige use-after-free llcp_sock_bind/connect Commits 8a4cd82d (\\\"nfc: corrige la fuga de refcount en llcp_sock_connect()\\\") y c33b1cc62 (\\\"nfc: corrige la fuga de refcount en llcp_sock_bind()\\\") corrigi\u00f3 un error de fuga de recuento en bind/connect pero introdujo un Use-After-Free si el mismo local est\u00e1 asignado a 2 sockets diferentes. Esto puede activarse mediante el siguiente programa simple: int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP ); int sock2 = conector (AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP); memset( \u0026amp;addr, 0, sizeof(struct sockaddr_nfc_llcp) ); addr.sa_family = AF_NFC; addr.nfc_protocol = NFC_PROTO_NFC_DEP; bind( sock1, (struct sockaddr*) \u0026amp; addr, sizeof(struct sockaddr_nfc_llcp) ) bind( sock2, (struct sockaddr*) \u0026amp; addr, sizeof(struct sockaddr_nfc_llcp) ) close(sock1); cerrar(calcet\u00edn2); Solucione este problema asignando NULL a llcp_sock-\u0026gt;local despu\u00e9s de llamar a nfc_llcp_local_put. Esto aborda CVE-2021-23134.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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}


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