CVE-2019-18835 Improper Verification of Cryptographic Signature in matrix-synapse
Attackers can bypass signature checks on federation APIs, allowing unsigned or spoofed events to be accepted by the Matrix Synapse server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-18835?
CVE-2019-18835 is a critical vulnerability in n/a, published on 7 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Matrix Synapse before 1.5.0 mishandles signature checking on some federation APIs. Events sent over /send_join, /send_leave, and /invite may not be correctly signed, or may not come from the expected servers.
Weakness: CWE-345
Which versions are affected by CVE-2019-18835?
3 open source packages ship an affected version, including matrix-synapse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
matrix-synapse PyPI | All versions | 1.5.0 |
matrix-synapse PyPI | All versions | 1.5.0 |
matrix-synapse PyPI | All versions | 1.5.0 |
Products include Matrix Synapse.
How do I fix CVE-2019-18835?
Upgrade matrix-synapse to 1.5.0 or later.
Is CVE-2019-18835 being exploited?
There is no known exploitation of CVE-2019-18835 in the wild and no public exploit code.
Other vulnerabilities in n/a
- CVE-2024-52815 Synapse allows a a malformed invite to break the invitee's `/sync`
- CVE-2024-52805 Synapse allows unsupported content types to lead to memory exhaustion
- CVE-2024-53863 Synapse can be forced to thumbnail unexpected file formats, invoking external, potentially untrustworthy decoders
- CVE-2024-37302 Synapse denial of service through media disk space consumption
- CVE-2018-12423 Matrix Synapse Authorization Error
Sources
Also known as GHSA-cppw-2mf8-qpm5, PYSEC-2019-186, UBUNTU-CVE-2019-18835.