CVE-2024-0397 Memory race condition in ssl.SSLContext certificate store methods

2024-06-1715:09:40

PSF

github.com

python

ssl module

memory race condition

sslcontext

certificate store

cpython 3.10.14

tls handshake

cpython 3.11.9

cpython 3.12.3

cpython 3.13.0a5

AI Score

6.5

Confidence

Low

SSVC

Exploitation

none

Automatable

Technical Impact

total

JSON

A defect was discovered in the Python “ssl” module where there is a memory
race condition with the ssl.SSLContext methods “cert_store_stats()” and
“get_ca_certs()”. The race condition can be triggered if the methods are
called at the same time as certificates are loaded into the SSLContext,
such as during the TLS handshake with a certificate directory configured.
This issue is fixed in CPython 3.10.14, 3.11.9, 3.12.3, and 3.13.0a5.

ADP Affected

[
  {
    "cpes": [
      "cpe:2.3:a:python_software_foundation:cpython:*:*:*:*:*:*:*:*"
    ],
    "vendor": "python_software_foundation",
    "product": "cpython",
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "3.8.20",
        "versionType": "python"
      },
      {
        "status": "affected",
        "version": "3.9.0",
        "lessThan": "3.9.20",
        "versionType": "python"
      },
      {
        "status": "affected",
        "version": "3.10.0",
        "lessThan": "3.10.14",
        "versionType": "python"
      },
      {
        "status": "affected",
        "version": "3.11.0",
        "lessThan": "3.11.9",
        "versionType": "python"
      },
      {
        "status": "affected",
        "version": "3.12.0",
        "lessThan": "3.12.3",
        "versionType": "python"
      },
      {
        "status": "affected",
        "version": "3.13.0a1",
        "lessThan": "3.13.0a5",
        "versionType": "python"
      }
    ],
    "defaultStatus": "unaffected"
  }
]