Bug 1926758 (CVE-2020-28473)

Summary:	CVE-2020-28473 python-bottle: Web Cache Poisoning by using a vector called parameter cloaking may lead to integrity and availability compromise
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	kdudka, metherid, m.samia
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	python-bottle 0.12.19	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-28 12:11:33 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1926759, 1926760, 1928219, 1928220
Bug Blocks:	1926762

Description Marian Rehak 2021-02-09 12:19:53 UTC

The package bottle from 0 and before 0.12.19 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.

Reference:

https://lists.debian.org/debian-lts-announce/2021/01/msg00019.html

Comment 1 Marian Rehak 2021-02-09 12:20:18 UTC

Created python-bottle tracking bugs for this issue:

Affects: epel-7 [bug 1926760]
Affects: fedora-all [bug 1926759]

Comment 2 Riccardo Schirone 2021-02-12 16:34:51 UTC

Upstream patch:
https://github.com/bottlepy/bottle/commit/57a2f22e0c1d2b328c4f54bf75741d74f47f1a6b

Comment 3 Riccardo Schirone 2021-02-12 16:35:31 UTC

External References:

https://snyk.io/vuln/SNYK-PYTHON-BOTTLE-1017108