CVE-2021-29622
Arbitrary redirects under /new endpoint
Description
Prometheus is an open-source monitoring system and time series database. In 2.23.0, Prometheus changed its default UI to the New ui. To ensure a seamless transition, the URL's prefixed by /new redirect to /. Due to a bug in the code, it is possible for an attacker to craft an URL that can redirect to any other URL, in the /new endpoint. If a user visits a prometheus server with a specially crafted address, they can be redirected to an arbitrary URL. The issue was patched in the 2.26.1 and 2.27.1 releases. In 2.28.0, the /new endpoint will be removed completely. The workaround is to disable access to /new via a reverse proxy in front of Prometheus.
How to fix CVE-2021-29622
To remediate CVE-2021-29622, upgrade the affected package to a fixed version below.
- —upgrade to 2.26.1 or later
- —upgrade to 2.26.1 or later
Is CVE-2021-29622 being exploited?
Likely — EPSS is 87.5%, placing CVE-2021-29622 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (2)
- >= 2.23.0, < 2.26.1, >= 2.27.0, < 2.27.1
- >= 2.23.0, < 2.26.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |