Vulnerability DatabaseCVE-2022-3257

CVE-2022-3257:
vulnerability analysis and mitigation

Overview

Mattermost version 7.1.x and earlier contains a vulnerability related to insufficient processing of specifically crafted GIF files during post drafting. The vulnerability was assigned CVE-2022-3257 and was disclosed on September 21, 2022. This security flaw affects the Mattermost server application (NVD, CVE).

Technical details

The vulnerability has been assigned a CVSS v3.1 base score of 6.5 (MEDIUM) by NIST with a vector string of CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. However, Mattermost, Inc. assessed it with a lower CVSS score of 3.1 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L. The vulnerability is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) and CWE-400 (Uncontrolled Resource Consumption) (NVD).

Impact

When exploited, this vulnerability can lead to server-side Denial of Service through resource exhaustion when processing specifically crafted GIF files. The impact is limited to authenticated users who can upload files while drafting posts (CVE).

Mitigation and workarounds

The vulnerability has been fixed in Mattermost version 7.2.0. Users are advised to upgrade to this version or later to mitigate the security risk (Mattermost Security).