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Vulnerability · Published May 19, 2021 · Assigned by GitHub_M

CVE-2021-29622Arbitrary redirects under /new endpoint

Medium 6.5

In plain English

A medium-severity open redirect in prometheus from prometheus. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 19.6% (higher than 97% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)19.6%top 2.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack tooling1Nuclei

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20prometheus2.27.1-r0ALPINE-CVE-2021-29622
Alpine:v3.21prometheus2.27.1-r0ALPINE-CVE-2021-29622
Alpine:v3.22prometheus2.27.1-r0ALPINE-CVE-2021-29622
Alpine:v3.23prometheus2.27.1-r0ALPINE-CVE-2021-29622
Alpine:v3.24prometheus2.27.1-r0ALPINE-CVE-2021-29622
Gogithub.com/prometheus/prometheus2.26.1GHSA-vx57-7f4q-fpc7
Gogithub.com/prometheus/prometheus2.27.1GHSA-vx57-7f4q-fpc7

Affected products (as reported)

VendorProductVersions
prometheus prometheus >= 2.23.0, < 2.27.1

Weakness: CWE-601 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

References