CVE-2021-47245 (GCVE-0-2021-47245)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:19 – Updated: 2025-05-04 07:07
VLAI?
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 48b1de4c110a7afa4b85862f6c75af817db26fad , < e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8 (git)
Affected: 48b1de4c110a7afa4b85862f6c75af817db26fad , < 576c1526b4d83c44ad7b673cb841f36cbc6cb6c4 (git)
Affected: 48b1de4c110a7afa4b85862f6c75af817db26fad , < 674b5f0c6a4fc5d3abce877048290cea6091fcb1 (git)
Affected: 48b1de4c110a7afa4b85862f6c75af817db26fad , < 7d9a9a1a88a3da574e019b4de756bc73337b3b0b (git)
Affected: 48b1de4c110a7afa4b85862f6c75af817db26fad , < 6defc77d48eff74075b80ad5925061b2fc010d98 (git)
Affected: 48b1de4c110a7afa4b85862f6c75af817db26fad , < 9cdf299ba4e153b5e56187648420de22c6216f02 (git)
Affected: 48b1de4c110a7afa4b85862f6c75af817db26fad , < f648089337cb8ed40b2bb96e244f72b9d97dc96b (git)
Affected: 48b1de4c110a7afa4b85862f6c75af817db26fad , < 5fc177ab759418c9537433e63301096e733fb915 (git)
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    Linux Linux Affected: 3.12
Unaffected: 0 , < 3.12 (semver)
Unaffected: 4.4.274 , ≤ 4.4.* (semver)
Unaffected: 4.9.274 , ≤ 4.9.* (semver)
Unaffected: 4.14.238 , ≤ 4.14.* (semver)
Unaffected: 4.19.196 , ≤ 4.19.* (semver)
Unaffected: 5.4.128 , ≤ 5.4.* (semver)
Unaffected: 5.10.46 , ≤ 5.10.* (semver)
Unaffected: 5.12.13 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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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. 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      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.