CVE-2021-47068
Vulnerability from cvelistv5
Published
2024-02-29 22:37
Modified
2024-12-19 07:34
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/nfc: fix use-after-free llcp_sock_bind/connect Commits 8a4cd82d ("nfc: fix refcount leak in llcp_sock_connect()") and c33b1cc62 ("nfc: fix refcount leak in llcp_sock_bind()") fixed a refcount leak bug in bind/connect but introduced a use-after-free if the same local is assigned to 2 different sockets. This can be triggered by the following simple program: int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP ); int sock2 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP ); memset( &addr, 0, sizeof(struct sockaddr_nfc_llcp) ); addr.sa_family = AF_NFC; addr.nfc_protocol = NFC_PROTO_NFC_DEP; bind( sock1, (struct sockaddr*) &addr, sizeof(struct sockaddr_nfc_llcp) ) bind( sock2, (struct sockaddr*) &addr, sizeof(struct sockaddr_nfc_llcp) ) close(sock1); close(sock2); Fix this by assigning NULL to llcp_sock->local after calling nfc_llcp_local_put. This addresses CVE-2021-23134.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8cPatch
Impacted products
Vendor Product Version
Linux Linux Version: 5.12
Show details on NVD website

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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47068\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-29T23:15:08.170\",\"lastModified\":\"2024-12-10T19:50:49.147\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.4.267\",\"versionEndExcluding\":\"4.4.269\",\"matchCriteriaId\":\"3F56FA3D-5B9E-455D-BA98-AAD5E4B15FDB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.9.267\",\"versionEndExcluding\":\"4.9.269\",\"matchCriteriaId\":\"B10FBDD9-624C-4294-AB93-D37D5CC2A04B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.14.231\",\"versionEndExcluding\":\"4.14.233\",\"matchCriteriaId\":\"60A4360B-1370-4097-A160-B99742C3235F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.19.187\",\"versionEndExcluding\":\"4.19.191\",\"matchCriteriaId\":\"884C2D43-91AB-4AB0-88F9-2DB0A7208D3B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.112\",\"versionEndExcluding\":\"5.4.119\",\"matchCriteriaId\":\"0A06D523-CBB3-4DF4-BCF1-5508C3DB89D9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.30\",\"versionEndExcluding\":\"5.10.37\",\"matchCriteriaId\":\"2D7B8DC6-CB38-4A86-8EC5-C0803B42FC8A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11.14\",\"versionEndExcluding\":\"5.11.21\",\"matchCriteriaId\":\"D0E4DE1B-ADA6-4853-BFAB-67C97C59255F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.12\",\"versionEndExcluding\":\"5.12.4\",\"matchCriteriaId\":\"D8C7052F-1B7B-4327-9C2B-84EBF3243838\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ccddad6dd28530e716448e594c9ca7c76ccd0570\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e32352070bcac22be6ed8ab635debc280bb65b8c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/18175fe17ae043a0b81e5d511f8817825784c299\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/18ae4a192a4496e48a5490b52812645d2413307c\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/26157c82ba756767b2bd66d28a71b1bc454447f6\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/374cdde4dcc9c909a60713abdbbf96d5e3e09f91\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/48fba458fe54cc2a980a05c13e6c19b8b2cfb610\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6b7021ed36dabf29e56842e3408781cd3b82ef6e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6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  }
}


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