SB2020061927 - Multiple vulnerabilities in Mattermost, Mattermost Server
Published: June 19, 2020 Updated: July 17, 2020
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 8 secuirty vulnerabilities.
1) Cross-site scripting (CVE-ID: CVE-2017-18913)
The vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data when processing data passed via a link on an error page. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
2) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2017-18914)
The vulnerability allows a remote non-authenticated attacker to manipulate data.
An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. An external link can occur on an error page even if it is not on an allowlist.
3) Incorrect default permissions (CVE-ID: CVE-2017-18915)
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. After a restart of a server, an attacker might suddenly gain API Endpoint access.
4) Incorrect permission assignment for critical resource (CVE-ID: CVE-2017-18916)
The vulnerability allows a remote non-authenticated attacker to manipulate data.
An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. API endpoint access control does not honor an integration permission restriction.
5) Use of Password Hash With Insufficient Computational Effort (CVE-ID: CVE-2017-18917)
The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.
An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. Weak hashing was used for e-mail invitations, OAuth, and e-mail verification tokens.
6) Incorrect permission assignment for critical resource (CVE-ID: CVE-2017-18910)
The vulnerability allows a remote authenticated user to manipulate data.
An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. E-mail notifications can have spoofed links.
7) Improper Certificate Validation (CVE-ID: CVE-2017-18911)
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. The X.509 certificate validation can be skipped for a TLS-based e-mail server.
8) Path traversal (CVE-ID: CVE-2017-18912)
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. It allows an attacker to specify a full pathname of a log file.
Remediation
Install update from vendor's website.