CVE-2021-3116

before_upstream_connection in AuthPlugin in http/proxy/auth.py in proxy.py before 2.3.1 accepts incorrect Proxy-Authorization header data because of a boolean confusion (and versus or).

Weakness

The product compares two entities in a security-relevant context, but the comparison is incorrect, which may lead to resultant weaknesses.

Affected Software

Extended Description

This Pillar covers several possibilities:

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/10.html
• https://cwe.mitre.org/data/definitions/120.html
• https://cwe.mitre.org/data/definitions/14.html
• https://cwe.mitre.org/data/definitions/15.html
• https://cwe.mitre.org/data/definitions/182.html
• https://cwe.mitre.org/data/definitions/24.html
• https://cwe.mitre.org/data/definitions/267.html
• https://cwe.mitre.org/data/definitions/3.html
• https://cwe.mitre.org/data/definitions/41.html
• https://cwe.mitre.org/data/definitions/43.html
• https://cwe.mitre.org/data/definitions/44.html
• https://cwe.mitre.org/data/definitions/45.html
• https://cwe.mitre.org/data/definitions/46.html
• https://cwe.mitre.org/data/definitions/47.html
• https://cwe.mitre.org/data/definitions/52.html
• https://cwe.mitre.org/data/definitions/53.html
• https://cwe.mitre.org/data/definitions/6.html
• https://cwe.mitre.org/data/definitions/64.html
• https://cwe.mitre.org/data/definitions/67.html
• https://cwe.mitre.org/data/definitions/7.html
• https://cwe.mitre.org/data/definitions/71.html
• https://cwe.mitre.org/data/definitions/73.html
• https://cwe.mitre.org/data/definitions/78.html
• https://cwe.mitre.org/data/definitions/79.html
• https://cwe.mitre.org/data/definitions/8.html
• https://cwe.mitre.org/data/definitions/80.html
• https://cwe.mitre.org/data/definitions/88.html
• https://cwe.mitre.org/data/definitions/9.html
• https://cwe.mitre.org/data/definitions/92.html

References

• https://cardaci.xyz/advisories/2021/01/10/proxy.py-2.3.0-broken-basic-authentication/
• https://github.com/abhinavsingh/proxy.py/pull/482/commits/9b00093288237f5073c403f2c4f62acfdfa8ed46
• https://pypi.org/project/proxy.py/2.3.1/#history