CVE-2023-22487
Post mentions can be used to read any post on the forum without access control
Description
Flarum is a forum software for building communities. Using the mentions feature provided by the flarum/mentions extension, users can mention any post ID on the forum with the special `@"<username>"#p<id>` syntax. The following behavior never changes no matter if the actor should be able to read the mentioned post or not: A URL to the mentioned post is inserted into the actor post HTML, leaking its discussion ID and post number. The `mentionsPosts` relationship included in the `POST /api/posts` and `PATCH /api/posts/<id>` JSON responses leaks the full JSON:API payload of all mentioned posts without any access control. This includes the content, date, number and attributes added by other extensions. An attacker only needs the ability to create new posts on the forum to exploit the vulnerability. This works even if new posts require approval. If they have the ability to edit posts, the attack can be performed even more discreetly by using a single post to scan any size of database and hiding the attack post content afterward. The attack allows the leaking of all posts in the forum database, including posts awaiting approval, posts in tags the user has no access to, and private discussions created by other extensions like FriendsOfFlarum Byobu. This also includes non-comment posts like tag changes or renaming events. The discussion payload is not leaked but using the mention HTML payload it's possible to extract the discussion ID of all posts and combine all posts back together into their original discussions even if the discussion title remains unknown. All Flarum versions prior to 1.6.3 are affected. The vulnerability has been fixed and published as flarum/core v1.6.3. As a workaround, user can disable the mentions extension.
INFO
Published Date :
Jan. 11, 2023, 8:15 p.m.
Last Modified :
Nov. 21, 2024, 7:44 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Public PoC/Exploit Available at Github
CVE-2023-22487 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2023-22487.
| URL | Resource |
|---|---|
| https://github.com/flarum/framework/commit/ab1c868b978e8b0d09a5d682c54665dae17d0985 | Patch Third Party Advisory |
| https://github.com/flarum/framework/security/advisories/GHSA-22m9-m3ww-53h3 | Exploit Mitigation Third Party Advisory |
| https://github.com/flarum/framework/commit/ab1c868b978e8b0d09a5d682c54665dae17d0985 | Patch Third Party Advisory |
| https://github.com/flarum/framework/security/advisories/GHSA-22m9-m3ww-53h3 | Exploit Mitigation Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-22487 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2023-22487
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Python
Proof of concept for EPSS API interaction.
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2023-22487 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-22487 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/flarum/framework/commit/ab1c868b978e8b0d09a5d682c54665dae17d0985 Added Reference https://github.com/flarum/framework/security/advisories/GHSA-22m9-m3ww-53h3 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Jan. 19, 2023
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Changed Reference Type https://github.com/flarum/framework/commit/ab1c868b978e8b0d09a5d682c54665dae17d0985 No Types Assigned https://github.com/flarum/framework/commit/ab1c868b978e8b0d09a5d682c54665dae17d0985 Patch, Third Party Advisory Changed Reference Type https://github.com/flarum/framework/security/advisories/GHSA-22m9-m3ww-53h3 No Types Assigned https://github.com/flarum/framework/security/advisories/GHSA-22m9-m3ww-53h3 Exploit, Mitigation, Third Party Advisory Added CWE NIST NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:a:flarum:flarum:*:*:*:*:*:*:*:* versions up to (excluding) 1.6.3
Vulnerability Scoring Details
Base CVSS Score: 7.7
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.07 }} -0.14%
score
0.17321
percentile