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CVE-2023-43796

MEDIUM
Published 2023-10-31T16:52:48.505Z
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CVSS Score

V3.1
5.3
/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.002
probability
of exploitation in the wild

There is a 0.2% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.387
Higher than 38.7% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
LOW
Integrity
NONE
Availability
NONE

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

matrix-org

synapse

Affected Versions:

< 1.95.1

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed MODERATE

Synapse vulnerable to leak of remote user device information

GHSA-mp92-3jfm-3575

Advisory Details

### Impact Cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver. ### Patches System administrators are encouraged to upgrade to Synapse 1.95.1 as soon as possible. ### Workarounds The `federation_domain_whitelist` can be used to limit federation traffic with a homeserver.

Affected Packages

PyPI matrix-synapse
ECOSYSTEM: ≥0 <1.95.1

CVSS Scoring

CVSS Score

5.0

CVSS Vector

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

References

WEB https://github.com/matrix-org/synapse/security/advisories/GHSA-mp92-3jfm-3575
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2023-43796
WEB https://github.com/matrix-org/synapse/commit/daec55e1fe120c564240c5386e77941372bf458f
PACKAGE https://github.com/matrix-org/synapse
WEB https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2023-230.yaml
WEB https://lists.fedoraproject.org/archives/list/[email protected]/message/2IDEEZMFJBDLTFHQUTZRJJNCOZGQ2ZVS
WEB https://lists.fedoraproject.org/archives/list/[email protected]/message/VH3RNC5ZPQZ4OKPSL4E6BBJSZOQLGDEY
WEB https://security.gentoo.org/glsa/202401-12

Advisory provided by GitHub Security Advisory Database. Published: October 31, 2023, Modified: February 13, 2025

References

https://github.com/matrix-org/synapse/security/advisories/GHSA-mp92-3jfm-3575
https://github.com/matrix-org/synapse/commit/daec55e1fe120c564240c5386e77941372bf458f
https://lists.fedoraproject.org/archives/list/[email protected]/message/VH3RNC5ZPQZ4OKPSL4E6BBJSZOQLGDEY/
https://lists.fedoraproject.org/archives/list/[email protected]/message/2IDEEZMFJBDLTFHQUTZRJJNCOZGQ2ZVS/
https://security.gentoo.org/glsa/202401-12
Published: 2023-10-31T16:52:48.505Z
Last Modified: 2025-02-13T17:13:30.615Z
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