Key management errors in Synapse - CVE-2019-5885
Published: May 17, 2023
Vulnerability identifier: #VU76259
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2019-5885
CWE-ID: CWE-320
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to impersonate application users.
The vulnerability exists due to usage of a weak and predictable secret key if the macaroon_secret_key authentication parameter is not set. A remote attacker can impersonate other application users.
Affected software
Synapse
Arch Linux
Ubuntu
Fedora
matrix-synapse (Ubuntu package)
matrix-synapse
Arch Linux
Ubuntu
Fedora
matrix-synapse (Ubuntu package)
matrix-synapse
How to mitigate CVE-2019-5885
Install updates from vendor's website.
Synapse - update to 0.34.0.1
matrix-synapse (Ubuntu package) - update to Ubuntu Pro
matrix-synapse - addressed in versions 0.34.0.1-1.fc29, 0.34.0.1-2.fc28
matrix-synapse - update to 0.34.1.1-1
matrix-synapse (Ubuntu package) - update to Ubuntu Pro
matrix-synapse - addressed in versions 0.34.0.1-1.fc29, 0.34.0.1-2.fc28
matrix-synapse - update to 0.34.1.1-1
External References
- https://matrix.org/blog/2019/01/15/further-details-on-critical-security-update-in-synapse-affecting-all-versions-prior-to-0-34-1-cve-2019-5885/
- https://matrix.org/blog/2019/01/10/critical-security-update-synapse-0-34-0-1-synapse-0-34-1-1/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VMCLO5PUPBA756UKY72PKUWL4RRM4W6K/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/32Y6KD3OAHCG5P33HC2QEX3NUZOSXCGZ/