Matrix Synapse up to 0.31.0 API handlers/federation.py on_get_missing_events 7pk security

Summaryinfo

A vulnerability, which was classified as problematic, was found in Matrix Synapse up to 0.31.0. Impacted is the function on_get_missing_events of the file handlers/federation.py of the component API. The manipulation results in 7pk security. This vulnerability is known as CVE-2018-12291. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Matrix Synapse up to 0.31.0. Affected is the function on_get_missing_events of the file handlers/federation.py of the component API. The manipulation with an unknown input leads to a 7pk security vulnerability. CWE is classifying the issue as CWE-254. This is going to have an impact on confidentiality. CVE summarizes:

The on_get_missing_events function in handlers/federation.py in Matrix Synapse before 0.31.1 has a security bug in the get_missing_events federation API where event visibility rules were not applied correctly.

The bug was discovered 06/08/2018. The weakness was published 06/13/2018 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability is traded as CVE-2018-12291 since 06/13/2018. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1211.

The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 110633 (openSUSE Security Update : matrix-synapse (openSUSE-2018-654)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171327 (OpenSUSE Security Update for matrix-synapse (openSUSE-SU-2018:1767-1)).

Upgrading to version 0.31.1 eliminates this vulnerability. A possible mitigation has been published 1 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (110633). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• Matrix

Name

• Synapse

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.31.0

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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