CVE-2019-5885 json
Matrix Synapse Predictable Secret Key
published 2019-03-19 7 y ago modified 2026-06-17 4 mo ago also GHSA-jrqm-v8cv-53ww , PYSEC-2019-187 , EUVD-2019-0084
- cvss
- 7.5
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.5%
- EPSS 2.5% chance of exploitation in 30 days, percentile 84%
- public exploits
- 0
- none known
Summary
Matrix Synapse before 0.34.0.1, when the macaroon_secret_key authentication parameter is not set, uses a predictable value to derive a secret key and other secrets which could allow remote attackers to impersonate users.
Patch / fix
- pypi matrix-synapse 0.34.0.1
- matrix synapse 0.34.0.1
- matrix-synapse Ubuntu Pro 18.04 LTS 0.24.0+dfsg-1ubuntu0.1~esm1
ubuntu advisories UBUNTU-CVE-2019-5885
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- matrix-synapse openSUSE Tumbleweed 1.43.0-1.1
opensuse advisories openSUSE-SU-2024:11041-1
- matrix-synapse Arch Linux 0.34.1.1-1
arch linux advisories AVG-846
- github.com/matrix-org/synapse#4315 pull request
- github.com/matrix-org/synapse#4373 pull request
Exploit prediction
2.48% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
| GitHub | 3.0 | 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | matrix-synapse | <0.34.0.1 |
0.34.0.1 |
Classification
- Weakness
-
- CWE-330 Use of Insufficiently Random Values
References
-
github.com
/matrix-org/synapse/pull/4315
web
-
github.com
/matrix-org/synapse/pull/4373
web
-
matrix.org
/blog/2019/01/10/critical-security-update-synapse-0-34-0-1-synapse-0-34-1-1/
vendor-advisory, article
-
matrix.org
/blog/2019/01/15/further-details-on-critical-security-update-in-synapse-affecting-all-versions-prior-to-0-34-1
vendor-advisory, article
- lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/32Y6KD3OAHCG5P33HC2QEX3NUZOSXCGZ/
- lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/VMCLO5PUPBA756UKY72PKUWL4RRM4W6K/
-
nvd.nist.gov
/vuln/detail/CVE-2019-5885
advisory
-
github.com
/matrix-org/synapse/issues/4664
web
-
github.com
/matrix-org/synapse
package
-
github.com
/matrix-org/synapse/blob/67f9e5293ea6650b2ec284c0b7503f3f3eade94b/docs/changelogs/CHANGES-pre-1.0.md?plain=1#L
web
-
github.com
/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2019-187.yaml
web
-
lists.fedoraproject.org
/archives/list/package-announce@lists.fedoraproject.org/message/32Y6KD3OAHCG5P33HC2QEX3NUZOSXCGZ
web
-
lists.fedoraproject.org
/archives/list/package-announce@lists.fedoraproject.org/message/VMCLO5PUPBA756UKY72PKUWL4RRM4W6K
web
-
matrix.org
/blog/2019/01/10/critical-security-update-synapse-0-34-0-1-synapse-0-34-1-1
web
-
matrix.org
/blog/2019/01/15/further-details-on-critical-security-update-in-synapse-affecting-all-versions-prior-to-0-34-1
web
-
lists.fedoraproject.org
/archives/list/package-announce@lists.fedoraproject.org/message/VMCLO5PUPBA756UKY72PKUWL4RRM4W6K/
web
-
lists.fedoraproject.org
/archives/list/package-announce@lists.fedoraproject.org/message/32Y6KD3OAHCG5P33HC2QEX3NUZOSXCGZ/
web
-
github.com
/advisories/GHSA-jrqm-v8cv-53ww
advisory
Sources
- CVE List CVE-2019-5885
- GitHub Advisory GHSA-jrqm-v8cv-53ww
- NVD CVE-2019-5885
- OSV PYSEC-2019-187
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.