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.

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.

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Python reports :

bpo-39603: Prevent http header injection by rejecting control characters in http.client.putrequest(...).

bpo-29778: Ensure python3.dll is loaded from correct locations when Python is embedded (CVE-2020-15523).

bpo-41004: CVE-2020-14422: The __hash__() methods of ipaddress.IPv4Interface and ipaddress.IPv6Interface incorrectly generated constant hash values of 32 and 128 respectively. This resulted in always causing hash collisions. The fix uses hash() to generate hash values for the tuple of (address, mask length, network address).

bpo-39073: Disallow CR or LF in email.headerregistry.Address arguments to guard against header injection attacks.

bpo-38576: Disallow control characters in hostnames in http.client, addressing CVE-2019-18348. Such potentially malicious header injection URLs now cause a InvalidURL to be raised.

bpo-39503: CVE-2020-8492: The AbstractBasicAuthHandler class of the urllib.request module uses an inefficient regular expression which can be exploited by an attacker to cause a denial of service. Fix the regex to prevent the catastrophic backtracking. Vulnerability reported by Ben Caller and Matt Schwager.

bpo-38945: Newline characters have been escaped when performing uu encoding to prevent them from overflowing into to content section of the encoded file. This prevents malicious or accidental modification of data during the decoding process.

bpo-38804: Fixes a ReDoS vulnerability in http.cookiejar. Patch by Ben Caller.

bpo-39017: Avoid infinite loop when reading specially crafted TAR files using the tarfile module (CVE-2019-20907).

bpo-41183: Use 3072 RSA keys and SHA-256 signature for test certs and keys.

bpo-39503: AbstractBasicAuthHandler of urllib.request now parses all WWW-Authenticate HTTP headers and accepts multiple challenges per header: use the realm of the first Basic challenge.

Python reports :

bpo-29778: Ensure python3.dll is loaded from correct locations when Python is embedded (CVE-2020-15523).

bpo-41004: CVE-2020-14422: The __hash__() methods of ipaddress.IPv4Interface and ipaddress.IPv6Interface incorrectly generated constant hash values of 32 and 128 respectively. This resulted in always causing hash collisions. The fix uses hash() to generate hash values for the tuple of (address, mask length, network address).

bpo-39603: Prevent http header injection by rejecting control characters in http.client.putrequest(...).

The version of Python installed on the remote Windows host is 3.6.x prior to 3.6.12, 3.7.x prior to 3.7.9, 3.8.x prior to 3.8.4, or 3.9.x prior to 3.9.0b5. It is, therefore, affected by an elevation of privilege vulnerability. 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).

Python reports :

bpo-41162:Audit hooks are now cleared later during finalization to avoid missing events.

bpo-29778:Ensure python3.dll is loaded from correct locations when Python is embedded.

ID	Name	Product	Family	Severity
504099	Siemens SIMATIC S7-1500 Uncontrolled Search Path Element (CVE-2020-15523)	Tenable OT Security	Tenable.ot	high
140678	FreeBSD : Python -- multiple vulnerabilities (2cb21232-fb32-11ea-a929-a4bf014bf5f7)	Nessus	FreeBSD Local Security Checks	high
139714	FreeBSD : Python -- multiple vulnerabilities (3fcb70a4-e22d-11ea-98b2-080027846a02)	Nessus	FreeBSD Local Security Checks	high
139240	Python DLL Loading Local Privilege Escalation	Nessus	Windows	high
138784	FreeBSD : Python -- multiple vulnerabilities (a9eeb3a3-ca5e-11ea-930b-080027846a02)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2020-15523

high

Tenable Plugins

high

high

high

high

high