SB2023012721 - Multiple vulnerabilities in Discourse

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Main Vulnerability Database SB2023012721

SB2023012721 - Multiple vulnerabilities in Discourse

Published: January 27, 2023

Security Bulletin ID SB2023012721
Severity
Low
Patch available
YES
Number of vulnerabilities 6
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 6 secuirty vulnerabilities.


1) Resource exhaustion (CVE-ID: CVE-2023-23616)

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

The vulnerability exists due to application does not impose limits on the number of characters in the group membership request. A remote user can flood the database with a large amount of data and cause a denial of service (DoS) condition.


2) Information disclosure (CVE-ID: CVE-2023-23624)

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

The vulnerability exists due to an error in application. Using the exclude_tag param a use can filter out topics and deduce, which ones are using a specific hidden tag. This affects any Discourse site using hidden tags in public categories.


3) Improper access control (CVE-ID: CVE-2023-23620)

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

The vulnerability exists due to improper access restrictions. A remote attacker can bypass implemented security restrictions and access latest or top routes for restricted tags.


4) Resource exhaustion (CVE-ID: CVE-2023-22739)

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

The vulnerability exists due to application does not impose limits on data contained in a draft. A remote user can trigger resource exhaustion and creating a large topic drafts.


5) Resource exhaustion (CVE-ID: CVE-2023-22740)

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

The vulnerability exists due to application does not limit the length and number of drafts created by its users. A remote user can cause a denial of service by generating an excessive load on the server via an  unlimited number of drafts.


6) Stored cross-site scripting (CVE-ID: CVE-2023-22468)

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

The vulnerability exists due to insufficient sanitization of user-supplied data when parsing URLs. A remote user can inject 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.


Remediation

Install update from vendor's website.

References