CVE-2023-37259 Cross site scripting in Export Chat feature
A malicious homeserver can inject scripts into the Export Chat feature, potentially leaking message contents to attackers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2023-37259?
CVE-2023-37259 is a medium-severity cross-site scripting vulnerability in matrix-org matrix-react-sdk, published on 18 Jul 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
matrix-react-sdk is a react-based SDK for inserting a Matrix chat/voip client into a web page. The Export Chat feature includes certain attacker-controlled elements in the generated document without sufficient escaping, leading to stored Cross site scripting (XSS). Since the Export Chat feature generates a separate document, an attacker can only inject code run from the `null` origin, restricting the impact. However, the attacker can still potentially use the XSS to leak message contents. A malicious homeserver is a potential attacker since the affected inputs are controllable server-side. This issue has been addressed in commit `22fcd34c60` which is included in release version 3.76.0. Users are advised to upgrade. The only known workaround for this issue is to disable or to not use the Export Chat feature.
Weakness: CWE-79
Which versions are affected by CVE-2023-37259?
2 open source packages ship an affected version, including matrix-react-sdk. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
matrix-react-sdk npm | From 3.32.0 | 3.76.0 |
matrix-react-sdk npm | From 3.32.0 | 3.76.0 |
Linux distribution packages (2)
element-desktop openSUSE:Tumbleweed | All versions | 1.11.36-1.1 |
element-web openSUSE:Tumbleweed | All versions | 1.11.36-1.1 |
Products include Matrix-React-Sdk Project Matrix-React-Sdk.
How do I fix CVE-2023-37259?
Upgrade matrix-react-sdk to 3.76.0 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2023-37259 being exploited?
There is no known exploitation of CVE-2023-37259 in the wild and no public exploit code.
Other vulnerabilities in matrix-org matrix-react-sdk
- CVE-2023-28103 Prototype pollution in matrix-react-sdk
- CVE-2023-30609 matrix-react-sdk vulnerable to HTML injection in search results via plaintext message highlighting
- CVE-2021-32622 File upload local preview can run embedded scripts after user interaction
- CVE-2021-21320 User content sandbox can be confused into opening arbitrary documents
Sources
Also known as GHSA-c9vx-2g7w-rp65, openSUSE-SU-2024:13054-1, openSUSE-SU-2024:13055-1.