cve-2024-12254
Vulnerability from cvelistv5
Published
2024-12-06 15:19
Modified
2025-02-05 16:54
Severity ?
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
Summary
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.
References
cna@python.orghttps://github.com/python/cpython/commit/71e8429ac8e2adc10084ab5ec29a62f4b6671a82
cna@python.orghttps://github.com/python/cpython/commit/9aa0deb2eef2655a1029ba228527b152353135b5
cna@python.orghttps://github.com/python/cpython/commit/e991ac8f2037d78140e417cc9a9486223eb3e786
cna@python.orghttps://github.com/python/cpython/issues/127655
cna@python.orghttps://github.com/python/cpython/pull/127656
cna@python.orghttps://mail.python.org/archives/list/security-announce@python.org/thread/H4O3UBAOAQQXGT4RE3E4XQYR5XLROORB/
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/12/06/1
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 3.12.0
Version: 3.13.0
Version: 3.14.0a1
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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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"<div>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.<br></div><div><br></div><div>This\\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.</div><br>\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-400\", \"description\": \"CWE-400 Uncontrolled Resource Consumption\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"CWE-770 Allocation of Resources Without Limits or Throttling\"}]}], \"providerMetadata\": {\"orgId\": \"28c92f92-d60d-412d-b760-e73465c3df22\", \"shortName\": \"PSF\", \"dateUpdated\": \"2025-02-04T20:38:34.082Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-12254\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-02-05T16:54:28.955Z\", \"dateReserved\": \"2024-12-05T16:17:55.154Z\", \"assignerOrgId\": \"28c92f92-d60d-412d-b760-e73465c3df22\", \"datePublished\": \"2024-12-06T15:19:41.576Z\", \"assignerShortName\": \"PSF\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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