ghsa-ph84-rcj2-fxxm
Vulnerability from github
Published
2024-12-06 18:30
Modified
2025-01-31 21:32
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Details

Starting in Python 3.12.0, the asyncio._SelectorSocketTransport.writelines() method would not "pause" writing and signal to the Protocol to drain the buffer to the wire once the write buffer reached the "high-water mark". Because of this, Protocols would not periodically drain the write buffer potentially leading to memory exhaustion.

This vulnerability likely impacts a small number of users, you must be using Python 3.12.0 or later, on macOS or Linux, using the asyncio module with protocols, and using .writelines() method which had new zero-copy-on-write behavior in Python 3.12.0 and later. If not all of these factors are true then your usage of Python is unaffected.

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{
   affected: [],
   aliases: [
      "CVE-2024-12254",
   ],
   database_specific: {
      cwe_ids: [
         "CWE-400",
         "CWE-770",
      ],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2024-12-06T16:15:20Z",
      severity: "HIGH",
   },
   details: "Starting in Python 3.12.0, the asyncio._SelectorSocketTransport.writelines()\n method would not \"pause\" writing and signal to the Protocol to drain \nthe buffer to the wire once the write buffer reached the \"high-water \nmark\". Because of this, Protocols would not periodically drain the write\n buffer potentially leading to memory exhaustion.\n\n\n\n\n\nThis\n vulnerability likely impacts a small number of users, you must be using\n Python 3.12.0 or later, on macOS or Linux, using the asyncio module \nwith protocols, and using .writelines() method which had new \nzero-copy-on-write behavior in Python 3.12.0 and later. If not all of \nthese factors are true then your usage of Python is unaffected.",
   id: "GHSA-ph84-rcj2-fxxm",
   modified: "2025-01-31T21:32:44Z",
   published: "2024-12-06T18:30:45Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2024-12254",
      },
      {
         type: "WEB",
         url: "https://github.com/python/cpython/issues/127655",
      },
      {
         type: "WEB",
         url: "https://github.com/python/cpython/pull/127656",
      },
      {
         type: "WEB",
         url: "https://github.com/python/cpython/commit/71e8429ac8e2adc10084ab5ec29a62f4b6671a82",
      },
      {
         type: "WEB",
         url: "https://github.com/python/cpython/commit/9aa0deb2eef2655a1029ba228527b152353135b5",
      },
      {
         type: "WEB",
         url: "https://github.com/python/cpython/commit/e991ac8f2037d78140e417cc9a9486223eb3e786",
      },
      {
         type: "WEB",
         url: "https://mail.python.org/archives/list/security-announce@python.org/thread/H4O3UBAOAQQXGT4RE3E4XQYR5XLROORB",
      },
      {
         type: "WEB",
         url: "http://www.openwall.com/lists/oss-security/2024/12/06/1",
      },
   ],
   schema_version: "1.4.0",
   severity: [
      {
         score: "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
         type: "CVSS_V3",
      },
      {
         score: "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
         type: "CVSS_V4",
      },
   ],
}


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