Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 2^63 - 1 render rooms unusable, related to federation/federation_base.py and handlers/message.py, as exploited in the wild in April 2018.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with
    depth = 2^63 - 1 render rooms unusable, related to federation/federation_base.py and handlers/message.py,
    as exploited in the wild in April 2018. (CVE-2018-10657)

The remote Ubuntu 18.04 ESM host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-6076-1 advisory.

    It was discovered that Synapse incorrectly handled certain inputs. If a user or an automated system were     tricked into opening a specially crafted input file, a remote attacker could possibly use this issue to     cause a denial of service. (CVE-2019-18835, CVE-2018-12291, CVE-2018-10657)

    It was discovered that Synapse incorrectly handled certain inputs. If a user or an automated system were     tricked into opening a specially crafted input file, a remote attacker could possibly use this issue to     hijack the session. (CVE-2019-11842, CVE-2018-12423)

    It was discovered that Synapse incorrectly handled certain inputs. If a user or an automated system were     tricked into opening a specially crafted input file, a remote attacker could possibly use this issue to     perform

    spoofing or user impersonation. (CVE-2019-5885, CVE-2018-16515)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Update to latest upstream

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
434574	SCA: security update for matrix-synapse (GHSA-vmcc-4p4x-x7wg)	Tenable Cloud Security	SCA Checks	high
434574	SCA: security update for matrix-synapse (GHSA-vmcc-4p4x-x7wg)	Tenable Self-Hosted Container Security	SCA Checks	high
175821	Ubuntu 18.04 ESM : Synapse vulnerabilities (USN-6076-1)	Nessus	Ubuntu Local Security Checks	critical
120912	Fedora 28 : matrix-synapse (2018-f513267ac5)	Nessus	Fedora Local Security Checks	high

Detections

Analytics

CVE-2018-10657

high

Tenable Plugins

high

high

critical

high