GoogleOSV:GHSA-5CHR-WJW5-3GQ4matrix-synapse vulnerable to denial of service due to malicious server ACL events
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
53.3%
Impact
A malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service.
Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affected.
Patches
Server administrators are advised to upgrade to Synapse 1.94.0 or later.
Workarounds
Rooms with malicious server ACL events can be purged and blocked using the admin API.
References
github.com/matrix-org/synapse
github.com/matrix-org/synapse/commit/f84da3c32ec74cf054e2fd6d10618aa4997cffaa
github.com/matrix-org/synapse/pull/16360
github.com/matrix-org/synapse/security/advisories/GHSA-5chr-wjw5-3gq4
github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2023-199.yaml
lists.fedoraproject.org/archives/list/[email protected]/message/KEVRB4MG5UXQ5RLZHSUJXM5GWEBYYS5B
lists.fedoraproject.org/archives/list/[email protected]/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY
lists.fedoraproject.org/archives/list/[email protected]/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3
matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version
nvd.nist.gov/vuln/detail/CVE-2023-45129
security.gentoo.org/glsa/202401-12
Related
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
53.3%