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githubGitHub Advisory DatabaseGHSA-2HWX-MJRM-V3G8
HistoryMar 01, 2021 - 7:34 p.m.

Denial of service attack via .well-known lookups

2021-03-0119:34:54
CWE-400
CWE-770
GitHub Advisory Database
github.com
31

4.3 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:N/I:N/A:P

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

0.002 Low

EPSS

Percentile

54.8%

JSON

Impact

A malicious homeserver could redirect requests to their .well-known file to a large file. This can lead to a denial of service attack where homeservers will consume significantly more resources when requesting the .well-known file of a malicious homeserver.

This affects any server which accepts federation requests from untrusted servers.

Patches

Issue is resolved by #8950. A bug not affecting the security aspects of this was fixed in #9108.

Workarounds

The federation_domain_whitelist setting can be used to restrict the homeservers communicated with over federation.

Affected configurations

Vulners
Node
matrixsynapseRange0.99.0≥
OR
matrixsynapseRange<1.25.0

Related

debiancve 1
cvelist 1
cve 1
osv 3
nvd 1
veracode 2
prion 1
ubuntucve 1
openvas 1
fedora 1
debiancve
debiancve
CVE-2021-21274
2021-02-26 18:15:12
cvelist
cvelist
CVE-2021-21274 Denial of service attack via .well-known lookups
2021-02-26 17:25:16
cve
cve
CVE-2021-21274
2021-02-26 18:15:12
osv
osv
CVE-2021-21274
2021-02-26 18:15:12
Denial of service attack via .well-known lookups
2021-03-01 19:34:54
PYSEC-2021-132
2021-02-26 18:15:00
nvd
nvd
CVE-2021-21274
2021-02-26 18:15:12
veracode
veracode
Denial Of Service (DoS)
2021-03-01 07:37:05
Denial Of Service (DoS)
2021-02-28 01:21:52
prion
prion
Code injection
2021-02-26 18:15:00
ubuntucve
ubuntucve
CVE-2021-21274
2021-02-26 00:00:00
openvas
openvas
Fedora: Security Advisory for matrix-synapse (FEDORA-2021-a627cfd31e)
2021-08-02 00:00:00
fedora
fedora
[SECURITY] Fedora 34 Update: matrix-synapse-1.38.1-1.fc34
2021-08-02 01:05:20

4.3 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:N/I:N/A:P

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

0.002 Low

EPSS

Percentile

54.8%

JSON
Related for GHSA-2HWX-MJRM-V3G8
debiancve1cvelist1cve1osv3nvd1veracode2prion1ubuntucve1openvas1fedora1