SB2023111318 - Multiple vulnerabilities in Discourse

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Main Vulnerability Database SB2023111318

SB2023111318 - Multiple vulnerabilities in Discourse

Published: November 13, 2023 Updated: February 21, 2025

Security Bulletin ID SB2023111318
Severity
Medium
Patch available
YES
Number of vulnerabilities 6
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 33% Low 67%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 6 secuirty vulnerabilities.


1) Input validation error (CVE-ID: CVE-2023-45806)

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

The vulnerability exists due to regexp injection issue in Full Name. A remote user can pass specially crafted input to the application and perform a denial of service (DoS) attack.


2) Information disclosure (CVE-ID: CVE-2023-45816)

The vulnerability allows a local attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application. A local attacker can gain access to unread bookmark reminder notifications.


3) Improper access control (CVE-ID: CVE-2023-46130)

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to height value bypass in some theme components. A remote user can add svgs with unlimited height attributes and affect the availability of subsequent replies in a topic.


4) Cross-site scripting (CVE-ID: CVE-2023-47119)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in oneboxed links. 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.


5) Input validation error (CVE-ID: CVE-2023-47120)

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 within the Onebox favicon URL. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.


6) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2023-47121)

The disclosed vulnerability allows a remote attacker to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input in Embedding. A remote attacker can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.


Remediation

Install update from vendor's website.

References