GitHub Advisoryadvisory · PyPI

GHSA-jrh7-mhhx-6h88 Denial of service (via resource exhaustion) due to improper input validation on groups/communities endpoints

MEDIUM Published 2021-04-13 Modified 2024-09-30 Official page ↗
Aliases
CVE-2021-21393
Ecosystem
PyPI
Packages
matrix-synapse
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-20
Reviewed
2021-04-12

Affected packages

• PyPI matrix-synapse: < 1.28.0 → fixed in 1.28.0

Description

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.

Related

Alias · CVE (1)

  • CVE-2021-21393 Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). vulnerability

Weakness · CWE (1)

  • CWE-20 Improper Input Validation weakness

References