Arch Linux Security Advisory ASA-202105-25 ========================================== Severity: Medium Date : 2021-05-25 CVE-ID : CVE-2021-29622 Package : prometheus Type : open redirect Remote : Yes Link : https://security.archlinux.org/AVG-1971 Summary ======= The package prometheus before version 2.27.1-1 is vulnerable to open redirect. Resolution ========== Upgrade to 2.27.1-1. # pacman -Syu "prometheus>=2.27.1-1" The problem has been fixed upstream in version 2.27.1. Workaround ========== The issue can be mitigated by using the --web.external-url= flag with a path (e.g. --web.external-url=http://example.com/prometheus). Description =========== A security issue has been found in Prometheus before version 2.27.1. 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 (e.g. http://127.0.0.1:9090/new/new<url>), they can be redirected to an arbitrary URL. E.g. if a user visits http://127.0.0.1:9090/new/newhttp://www.google.com/, they will be redirected to http://google.com. Note: Users who use a --web.external-url= flag with a path (e.g. --web.external-url=http://example.com/prometheus) are not affected. Impact ====== A remote attacker can use crafted URLs to redirect victims from a Prometheus server instance to an arbitrary address. References ========== https://github.com/prometheus/prometheus/security/advisories/GHSA-vx57-7f4q-... https://github.com/prometheus/prometheus/commit/db7f0bcec27bd8aeebad6b08ac84... https://security.archlinux.org/CVE-2021-29622