要点
- CVE-2021-21393 は matrix-synapse, synapse (matrix) に影響する深刻度「中」 (CVSS 6.5) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：1.6%（全脆弱性の 75.7% より高い）。
- 対処：1.28.0 以降に更新してください。
概要
Impact
Missing input validation of some parameters on the groups (also known as communities) endpoints could cause excessive use of disk space and memory leading to resource exhaustion. Additionally clients may have issues rendering large fields.
Patches
This issue is fixed by #9321 and #9393.
Workarounds
The groups feature can be disabled (by setting enable_group_creation to False) to mitigate this issue. Note that it is disabled by default.
Other information
Note that the groups feature is not part of the Matrix specification and the chosen maximum lengths are arbitrary. Not all clients might abide by them.
NVD の説明
Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.28.0 Synapse is missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. Note that the groups feature is not part of the Matrix specification and the chosen maximum lengths are arbitrary. Not all clients might abide by them. Refer to referenced GitHub security advisory for additional details including workarounds.
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