Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2021-43794— Anonymous user cache poisoning via development-mode header in Discourse

Quick assessment

Affected
discourse discourse
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Discourse是一套开源的社区讨论平台。该平台包括社区、电子邮件和聊天室等功能。 Discourse存在安全漏洞，该漏洞源于软件在用户的缓存处理存在权限。攻击者可利用该漏洞可以毒化匿名(即未登录)用户的缓存，这样用户显示的是JSON blob而不是HTML页面。这可能导致部分拒绝服务。

CVSS 5.3 · Medium EPSS 1.05% · P63

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2021-43794

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Anonymous user cache poisoning via development-mode header in Discourse
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
资源在另一范围的外部可控制索引
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Discourse是一套开源的社区讨论平台。该平台包括社区、电子邮件和聊天室等功能。 Discourse存在安全漏洞，该漏洞源于软件在用户的缓存处理存在权限。攻击者可利用该漏洞可以毒化匿名(即未登录)用户的缓存，这样用户显示的是JSON blob而不是HTML页面。这可能导致部分拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
discourse discourse stable < 2.7.11 -

II. Public POCs for CVE-2021-43794

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-43794

请登录查看更多情报信息。

Patches & Fixes for CVE-2021-43794 (1)

Same Patch Batch · discourse · 2021-12-01 · 3 CVEs total

CVE-2021-43793 4.3 MEDIUM Bypass of Poll voting limits in Discourse
CVE-2021-43792 4.3 MEDIUM Notifications leak in Discourse

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-610

V. Comments for CVE-2021-43794

No comments yet

Leave a comment