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githubGitHub Advisory DatabaseGHSA-HXMP-PQCH-C8MM
HistoryDec 09, 2020 - 6:21 p.m.

Denial of service attack via incorrect parameters in Matrix Synapse

2020-12-0918:21:29
CWE-74
CWE-79
CWE-400
GitHub Advisory Database
github.com
27
denial of service
incorrect parameters
matrix synapse
malicious
homeserver
federated servers
patch
workaround
access limitation

CVSS2

4

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:S/C:N/I:N/A:P

CVSS3

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.002

Percentile

52.7%

JSON

Impact

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.

Patches

Issue is resolved by https://github.com/matrix-org/synapse/pull/8776.

Workarounds

Homeserver administrators could limit access to the federation API to trusted servers (for example via federation_domain_whitelist).

Affected configurations

Vulners
Node
matrixsynapseRange<1.23.1
VendorProductVersionCPE
matrixsynapse*cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*

Related

openvas 2
osv 4
ubuntucve 1
prion 1
veracode 1
fedora 2
cve 1
nessus 3
nvd 1
freebsd 1
cvelist 1
alpinelinux 1
debiancve 1
openvas
openvas
Fedora: Security Advisory for matrix-synapse (FEDORA-2020-eeb66c2ece)
2020-12-19 00:00:00
Fedora: Security Advisory for matrix-synapse (FEDORA-2020-a2172c484d)
2020-12-19 00:00:00
osv
osv
CVE-2020-26257
2020-12-09 19:15:11
PYSEC-2020-236
2020-12-09 19:15:00
Denial of service attack via incorrect parameters in Matrix Synapse
2020-12-09 18:21:29
ubuntucve
ubuntucve
CVE-2020-26257
2020-12-09 00:00:00
prion
prion
Design/Logic Flaw
2020-12-09 19:15:00
veracode
veracode
Denial Of Service (DoS)
2020-12-10 04:22:43
fedora
fedora
[SECURITY] Fedora 33 Update: matrix-synapse-1.24.0-1.fc33
2020-12-19 01:16:55
[SECURITY] Fedora 32 Update: matrix-synapse-1.24.0-1.fc32
2020-12-18 19:45:54
cve
cve
CVE-2020-26257
2020-12-09 19:15:11
nessus
nessus
FreeBSD : py-matrix-synapse -- DoS on Federation API (cfa0be42-3cd7-11eb-9de7-641c67a117d8)
2020-12-14 00:00:00
Fedora 32 : matrix-synapse (2020-a2172c484d)
2020-12-21 00:00:00
Fedora 33 : matrix-synapse (2020-eeb66c2ece)
2020-12-21 00:00:00
nvd
nvd
CVE-2020-26257
2020-12-09 19:15:11
freebsd
freebsd
py-matrix-synapse -- DoS on Federation API
2020-12-09 00:00:00
cvelist
cvelist
CVE-2020-26257 Denial of service attack via incorrect parameters to federation APIs
2020-12-09 18:25:15
alpinelinux
alpinelinux
CVE-2020-26257
2020-12-09 19:15:11
debiancve
debiancve
CVE-2020-26257
2020-12-09 19:15:11

CVSS2

4

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:S/C:N/I:N/A:P

CVSS3

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.002

Percentile

52.7%

JSON
Related for GHSA-HXMP-PQCH-C8MM
openvas2osv4ubuntucve1prion1veracode1fedora2cve1nessus3nvd1freebsd1cvelist1alpinelinux1debiancve1