CVE-2019-5885
Matrix Synapse Predictable Secret Key
7.5
HIGH
CVSS 3.1
EPSS 0.77%
Description
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.
How to fix CVE-2019-5885
To remediate CVE-2019-5885, upgrade the affected package to a fixed version below.
- Debian/matrix-synapse—upgrade to 0.34.1.1-1 or later
- —upgrade to 0.34.0.1 or later
- —upgrade to 0.34.0.1 or later
Is CVE-2019-5885 being exploited?
Low — EPSS is 0.8%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 0.34.1.1-1
- from 0, < 0.34.0.1
- from 0, < 0.34.0.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
References (17)
- ADVISORYgithub.com/advisories/GHSA-jrqm-v8cv-53ww
- ADVISORYmatrix.org/blog/2019/01/10/critical-security-update-synapse-0-34-0-1-synapse-0-34-1-1/
- ADVISORYmatrix.org/blog/2019/01/15/further-details-on-critical-security-update-in-synapse-affecting-all-versions-prior-to-0-34-1-cve-2019-5885/
- ADVISORYnvd.nist.gov