CVE-2021-43794

Anonymous user cache poisoning via development-mode header in Discourse

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Discourse is an open source discussion platform. In affected versions an attacker can poison the cache for anonymous (i.e. not logged in) users, such that the users are shown a JSON blob instead of the HTML page. This can lead to a partial denial-of-service. This issue is patched in the latest stable, beta and tests-passed versions of Discourse.

Discourse es una plataforma de debate de código abierto. En las versiones afectadas, un atacante puede envenenar la caché de los usuarios anónimos (es decir, los que no han iniciado sesión), de forma que se les muestre un blob JSON en lugar de la página HTML. Esto puede conllevar a una denegación de servicio parcial. Este problema está parcheado en las últimas versiones estables, beta y de prueba de Discourse

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-11-16 CVE Reserved
2021-12-01 CVE Published
2024-08-04 CVE Updated
2024-08-16 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-610: Externally Controlled Reference to a Resource in Another Sphere

CAPEC

References (2)

URL	Tag	Source
https://github.com/discourse/discourse/security/advisories/GHSA-249g-pc77-65hp	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/discourse/discourse/commit/2da0001965c6d8632d723c46ea5df9f22a1a23f1	2021-12-03

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Discourse Search vendor "Discourse"		Discourse Search vendor "Discourse" for product "Discourse"				< 2.7.11 Search vendor "Discourse" for product "Discourse" and version " < 2.7.11"		-		Affected