Mattermost Server up to 5.9.5/5.14.4/5.15.1/5.16.0 Legacy Attackment Migration information disclosure

Summaryinfo

A vulnerability has been found in Mattermost Server up to 5.9.5/5.14.4/5.15.1/5.16.0 and classified as problematic. This issue affects some unknown processing of the component Legacy Attackment Migration Handler. This manipulation causes information disclosure. This vulnerability is registered as CVE-2019-20855. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Mattermost Server up to 5.9.5/5.14.4/5.15.1/5.16.0. It has been declared as problematic. Affected by this vulnerability is an unknown part of the component Legacy Attackment Migration Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

An issue was discovered in Mattermost Server before 5.16.1, 5.15.2, 5.14.5, and 5.9.6. It allows attackers to obtain sensitive information (local files) during legacy attachment migration.

The weakness was published 06/19/2020 (Website). The advisory is shared at mattermost.com. This vulnerability is known as CVE-2019-20855 since 06/19/2020. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 5.9.6, 5.14.5, 5.15.2 or 5.16.1 eliminates this vulnerability.

Similar entries are available at VDB-156956, VDB-156957, VDB-156958 and VDB-156959. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Groupware Software

Name

• Mattermost Server

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.9.0
• 5.9.1
• 5.9.2
• 5.9.3
• 5.9.4
• 5.9.5
• 5.10
• 5.11
• 5.12
• 5.13
• 5.14
• 5.14.0
• 5.14.1
• 5.14.2
• 5.14.3
• 5.14.4
• 5.15
• 5.15.0
• 5.15.1
• 5.16.0

License

• open-source

CPE 2.3info

• 🔍
• 🔍
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CPE 2.2info

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CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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