CVE-2021-47245 (GCVE-0-2021-47245)
Vulnerability from cvelistv5
Published
2024-05-21 14:19
Modified
2025-05-04 07:07
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: synproxy: Fix out of bounds when parsing TCP options The TCP option parser in synproxy (synproxy_parse_options) could read one byte out of bounds. When the length is 1, the execution flow gets into the loop, reads one byte of the opcode, and if the opcode is neither TCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds the length of 1. This fix is inspired by commit 9609dad263f8 ("ipv4: tcp_input: fix stack out of bounds when parsing TCP options."). v2 changes: Added an early return when length < 0 to avoid calling skb_header_pointer with negative length.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/576c1526b4d83c44ad7b673cb841f36cbc6cb6c4 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/5fc177ab759418c9537433e63301096e733fb915 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/674b5f0c6a4fc5d3abce877048290cea6091fcb1 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/6defc77d48eff74075b80ad5925061b2fc010d98 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/7d9a9a1a88a3da574e019b4de756bc73337b3b0b Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/9cdf299ba4e153b5e56187648420de22c6216f02 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/f648089337cb8ed40b2bb96e244f72b9d97dc96b Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/576c1526b4d83c44ad7b673cb841f36cbc6cb6c4 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/5fc177ab759418c9537433e63301096e733fb915 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/674b5f0c6a4fc5d3abce877048290cea6091fcb1 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/6defc77d48eff74075b80ad5925061b2fc010d98 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/7d9a9a1a88a3da574e019b4de756bc73337b3b0b Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/9cdf299ba4e153b5e56187648420de22c6216f02 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/f648089337cb8ed40b2bb96e244f72b9d97dc96b Patch
Impacted products
Vendor Product Version
Linux Linux Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
Version: 48b1de4c110a7afa4b85862f6c75af817db26fad
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47245\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:13.550\",\"lastModified\":\"2024-12-30T19:03:58.273\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: synproxy: Fix out of bounds when parsing TCP options\\n\\nThe TCP option parser in synproxy (synproxy_parse_options) could read\\none byte out of bounds. When the length is 1, the execution flow gets\\ninto the loop, reads one byte of the opcode, and if the opcode is\\nneither TCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds\\nthe length of 1.\\n\\nThis fix is inspired by commit 9609dad263f8 (\\\"ipv4: tcp_input: fix stack\\nout of bounds when parsing TCP options.\\\").\\n\\nv2 changes:\\n\\nAdded an early return when length \u003c 0 to avoid calling\\nskb_header_pointer with negative length.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: netfilter: synproxy: correcci\u00f3n de l\u00edmites al analizar opciones TCP. El analizador de opciones TCP en synproxy (synproxy_parse_options) podr\u00eda leer un byte fuera de los l\u00edmites. Cuando la longitud es 1, el flujo de ejecuci\u00f3n entra en el bucle, lee un byte del c\u00f3digo de operaci\u00f3n y, si el c\u00f3digo de operaci\u00f3n no es TCPOPT_EOL ni TCPOPT_NOP, lee un byte m\u00e1s, que excede la longitud de 1. Esta soluci\u00f3n est\u00e1 inspirada en la confirmaci\u00f3n. 9609dad263f8 (\\\"ipv4: tcp_input: corrige la pila fuera de los l\u00edmites al analizar las opciones de TCP\\\"). 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      "cveMetadata": "{\"cveId\": \"CVE-2021-47245\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-04T12:02:12.520Z\", \"dateReserved\": \"2024-04-10T18:59:19.533Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:19:43.648Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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