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Vulnerability · Published Oct 31, 2023 · Assigned by GitHub_M

CVE-2023-43796Synapse vulnerable to leak of remote user device information

Medium 5.3

In plain English

A medium-severity information exposure in synapse from matrix-org. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 68% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)1.2%top 31.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

Synapse is an open-source Matrix homeserver Prior to versions 1.95.1 and 1.96.0rc1, cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver. System administrators are encouraged to upgrade to Synapse 1.95.1 or 1.96.0rc1 to receive a patch. As a workaround, the `federation_domain_whitelist` can be used to limit federation traffic with a homeserver.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20synapse1.95.1-r0ALPINE-CVE-2023-43796
Alpine:v3.21synapse1.95.1-r0ALPINE-CVE-2023-43796
Alpine:v3.22synapse1.95.1-r0ALPINE-CVE-2023-43796
Alpine:v3.23synapse1.95.1-r0ALPINE-CVE-2023-43796
Alpine:v3.24synapse1.95.1-r0ALPINE-CVE-2023-43796
Debian:14matrix-synapse1.95.1-1DEBIAN-CVE-2023-43796
PyPImatrix-synapse1.95.1GHSA-mp92-3jfm-3575
PyPImatrix-synapse1.95.1PYSEC-2023-230

Affected products (as reported)

VendorProductVersions
matrix-org synapse < 1.95.1

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References