Related Vulnerabilities: CVE-2020-28476  

All versions of the package python-tornado are vulnerable to Web Cache Poisoning by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.

Severity Medium

Remote Yes

Type Incorrect calculation

Description

All versions of the package python-tornado are vulnerable to Web Cache Poisoning by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.

AVG-1461 python2-tornado 5.1.1-3 Medium Vulnerable

AVG-1460 python-tornado 6.1.0-3 Medium Vulnerable

https://snyk.io/vuln/SNYK-PYTHON-TORNADO-1017109
https://snyk.io/blog/cache-poisoning-in-popular-open-source-packages/