DoS through Onebox favicon URL

High

jomaxro published GHSA-77cw-xhj8-hfp3

Nov 9, 2023

Package

Discourse (Discourse)

Affected versions

stable > 3.1.0 && < 3.1.2; beta/tests-passed > 3.1.0.beta6 && < 3.2.0.beta2

Patched versions

stable >= 3.1.3; beta/tests-passed >= 3.2.0.beta3

Description

Impact

Redis memory can be depleted by crafting a site with an abnormally long favicon URL and drafting multiple posts which Onebox it.

Patches

This issue is patched in the latest stable, beta and tests-passed versions of Discourse.

Workarounds

None.

Severity

High

7.5

/ 10

CVSS base metrics

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H