Bug 1906325 (CVE-2020-26257) - CVE-2020-26257 matrix-synapse: incorrect parameters could result in DoS
Summary: CVE-2020-26257 matrix-synapse: incorrect parameters could result in DoS
Alias: CVE-2020-26257
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1906326
TreeView+ depends on / blocked
Reported: 2020-12-10 09:33 UTC by Michael Kaplan
Modified: 2021-02-16 18:45 UTC (History)
1 user (show)

Fixed In Version: matrix-synapse 1.23.1
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Clone Of:
Last Closed: 2020-12-10 12:47:00 UTC

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Description Michael Kaplan 2020-12-10 09:33:45 UTC
Matrix is an ecosystem for open federated Instant Messaging and VoIP. Synapse is a reference "homeserver" implementation of Matrix. A malicious or poorly-implemented homeserver can inject malformed events into a room by specifying a different room id in the path of a `/send_join`, `/send_leave`, `/invite` or `/exchange_third_party_invite` request. This can lead to a denial of service in which future events will not be correctly sent to other servers over federation. This affects any server which accepts federation requests from untrusted servers. The Matrix Synapse reference implementation before version 1.23.1 the implementation is vulnerable to this injection attack. Issue is fixed in version 1.23.1. As a workaround homeserver administrators could limit access to the federation API to trusted servers (for example via `federation_domain_whitelist`).

External References:


Comment 1 Michael Kaplan 2020-12-10 09:34:06 UTC
Created matrix-synapse tracking bugs for this issue:

Affects: fedora-all [bug 1906326]

Comment 2 Product Security DevOps Team 2020-12-10 12:47:00 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.

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