CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:S/C:N/I:N/A:P
CVSS3
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
Percentile
49.1%
Synapse is an open source home server implementation for the Matrix chat
network. In versions prior to 1.61.1 URL previews of some web pages can
exhaust the available stack space for the Synapse process due to unbounded
recursion. This is sometimes recoverable and leads to an error for the
request causing the problem, but in other cases the Synapse process may
crash altogether. It is possible to exploit this maliciously, either by
malicious users on the homeserver, or by remote users sending URLs that a
local user’s client may automatically request a URL preview for. Remote
users are not able to exploit this directly, because the URL preview
endpoint is authenticated. Deployments with url_preview_enabled: false
set in configuration are not affected. Deployments with
url_preview_enabled: true
set in configuration are affected.
Deployments with no configuration value set for url_preview_enabled
are
not affected, because the default is false
. Administrators of homeservers
with URL previews enabled are advised to upgrade to v1.61.1 or higher.
Users unable to upgrade should set url_preview_enabled
to false.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 18.04 | noarch | matrix-synapse | < any | UNKNOWN |
ubuntu | 20.04 | noarch | matrix-synapse | < any | UNKNOWN |
ubuntu | 22.04 | noarch | matrix-synapse | < any | UNKNOWN |
github.com/matrix-org/synapse/security/advisories/GHSA-22p3-qrh9-cx32
launchpad.net/bugs/cve/CVE-2022-31052
nvd.nist.gov/vuln/detail/CVE-2022-31052
security-tracker.debian.org/tracker/CVE-2022-31052
spec.matrix.org/v1.2/client-server-api/#get_matrixmediav3preview_url
www.cve.org/CVERecord?id=CVE-2022-31052
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:S/C:N/I:N/A:P
CVSS3
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
Percentile
49.1%