SB2021030111 - Multiple vulnerabilities in Matrix Synapse

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Main Vulnerability Database SB2021030111

SB2021030111 - Multiple vulnerabilities in Matrix Synapse

Published: March 1, 2021

Security Bulletin ID SB2021030111
Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Open redirect (CVE-ID: CVE-2021-21273)

The vulnerability allows a remote attacker to redirect victims to arbitrary URL.

The vulnerability exists due to improper sanitization of user-supplied data. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.


2) Input validation error (CVE-ID: CVE-2021-21274)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when requesting the .well-known file. A remote attacker can trick a victim to connect a specially crafted homeserver and perform a denial of service (DoS) attack.


Remediation

Install update from vendor's website.

References