PT-2021-19195 · Proxy.Py · Proxy.Py

Andrea Cardaci · Published 2021-01-11 · Updated 2024-02-15 · CVE-2021-3116

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions proxy.py versions prior to 2.3.1

Description The issue arises from a boolean confusion in the before upstream connection function within the AuthPlugin in http/proxy/auth.py, where it incorrectly accepts Proxy-Authorization header data due to a logical error involving 'and' versus 'or' operations.

Recommendations For versions prior to 2.3.1, update to version 2.3.1 or later to resolve the issue.

Exploit

Fix

Improper Authentication

Weakness Enumeration

CWE-697

CWE-480

CWE-287

Related Identifiers

CVE-2021-3116

GHSA-CMC7-MFMR-XQRX

PYSEC-2021-46

Affected Products

Proxy.Py

References · 15

• 🔥 https://cardaci.xyz/advisories/2021/01/10/proxy.py-2.3.0-broken-basic-authentication · Exploit
• https://github.com/abhinavsingh/proxy.py/pull/482/commits/9b00093288237f5073c403f2c4f62acfdfa8ed46 · Patch
• https://osv.dev/vulnerability/GHSA-cmc7-mfmr-xqrx · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-3116 · Security Note
• https://osv.dev/vulnerability/PYSEC-2021-46 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-3116 · Vendor Advisory
• https://github.com/abhinavsingh/proxy.py · Note
• https://github.com/abhinavsingh/proxy.py/pull/482 · Note
• https://github.com/abhinavsingh/proxy.py/commit/bff171ec26d826ae1d22d2466eaf9d8bdbf059d3 · Note
• https://github.com/pypa/advisory-database/tree/main/vulns/proxy-py/PYSEC-2021-46.yaml · Note
• https://github.com/advisories/GHSA-cmc7-mfmr-xqrx · Note
• https://t.me/cvenotify/71677 · Telegram Post
• https://t.me/cibsecurity/21892 · Telegram Post
• https://pypi.org/project/proxy.py/2.3.1/#history · Note
• https://t.me/cvenotify/8406 · Telegram Post