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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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.