CVE-2020-15523

Advisory

Python 3.5.10, 3.6.12, 3.7.9, 3.8.4 and 3.9.0 include a fix for CVE-2020-15523: A Trojan horse python3.dll might be used in cases where CPython is embedded in a native application. This occurs because python3X.dll may use an invalid search path for python3.dll loading (after Py_SetPath has been used).
#NOTE: This vulnerability affects only users of Windows.
#NOTE2: this issue CANNOT occur when using python.exe from a standard (non-embedded) Python installation on Windows.
https://python-security.readthedocs.io/vuln/pysetpath-python-dll-path.html

Affected package

Affected versions

Fixed versions

Vulnerability changelog

In Python 3.6 through 3.6.10, 3.7 through 3.7.8, 3.8 through 3.8.4rc1, and 3.9 through 3.9.0b4 on Windows, a Trojan horse python3.dll might be used in cases where CPython is embedded in a native application. This occurs because python3X.dll may use an invalid search path for python3.dll loading (after Py_SetPath has been used). NOTE: this issue CANNOT occur when using python.exe from a standard (non-embedded) Python installation on Windows.


MISC:https://bugs.python.org/issue29778: https://bugs.python.org/issue29778
MISC:https://github.com/python/cpython/pull/21297: https://github.com/python/cpython/pull/21297

Resources

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15523
• https://github.com/python/cpython/pull/21297
• https://bugs.python.org/issue29778
• https://security.netapp.com/advisory/ntap-20210312-0004/