Bug 1944135 (CVE-2021-21332)

Summary:	CVE-2021-21332 matrix-synapse: password reset endpoint is vulnerable to XSS
Product:	[Other] Security Response	Reporter:	Michael Kaplan <mkaplan>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	djc, fedora
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	matrix-synapse 1.27.0	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-03-29 17:35:09 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:	1944136
Bug Blocks:

Description Michael Kaplan 2021-03-29 11:36:42 UTC

In Synapse before version 1.27.0, the password reset endpoint served via Synapse was vulnerable to cross-site scripting (XSS) attacks. The impact depends on the configuration of the domain that Synapse is deployed on, but may allow access to cookies and other browser data, CSRF vulnerabilities, and access to other resources served on the same domain or parent domains. This is fixed in version 1.27.0.

Comment 1 Michael Kaplan 2021-03-29 11:36:47 UTC

External References:

https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df
https://github.com/matrix-org/synapse/pull/9200
https://github.com/matrix-org/synapse/releases/tag/v1.27.0
https://github.com/matrix-org/synapse/security/advisories/GHSA-246w-56m2-5899

Comment 2 Michael Kaplan 2021-03-29 11:37:04 UTC

Created matrix-synapse tracking bugs for this issue:

Affects: fedora-all [bug 1944136]

Comment 3 Product Security DevOps Team 2021-03-29 17:35:09 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.