CVE-2022-39239 @netlify/ipx vulnerable to Full Response SSRF and Stored XSS via Cache Poisoning and Improper Host Validation
Attackers can bypass domain allowlists to fetch arbitrary images via SSRF and inject malicious scripts through cached SVGs, leading to XSS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2022-39239?
CVE-2022-39239 is a medium-severity server-side request forgery vulnerability in netlify-ipx, published on 23 Sep 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
netlify-ipx is an on-Demand image optimization for Netlify using ipx. In versions prior to 1.2.3, an attacker can bypass the source image domain allowlist by sending specially crafted headers, causing the handler to load and return arbitrary images. Because the response is cached globally, this image will then be served to visitors without requiring those headers to be set. XSS can be achieved by requesting a malicious SVG with embedded scripts, which would then be served from the site domain. Note that this does not apply to images loaded in `<img>` tags, as scripts do not execute in this context. The image URL can be set in the header independently of the request URL, meaning any site images that have not previously been cached can have their cache poisoned. This problem has been fixed in version 1.2.3. As a workaround, cached content can be cleared by re-deploying the site.
Which versions are affected by CVE-2022-39239?
2 open source packages ship an affected version, including @netlify/ipx. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@netlify/ipx npm | All versions | 1.2.3 |
@netlify/ipx npm | All versions | 1.2.3 |
Products include Nuxtjs Netlify-Ipx.
How do I fix CVE-2022-39239?
Upgrade @netlify/ipx to 1.2.3 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2022-39239 being exploited?
There is no known exploitation of CVE-2022-39239 in the wild and no public exploit code.
Sources
Also known as GHSA-9jjv-524m-jm98.