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GHSA-vx57-7f4q-fpc7
No affected components available
Impact
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.
Patches
The issue will be patched in 2.26.1 and 2.27.1 releases. In 2.28.0, the /new endpoint will be removed completely.
Workarounds
The workaround is to disable access to /new via a reverse proxy in front of Prometheus.
Note: Users who use a --web.external-url= flag with a path (e.g. --web.external-url=http://example.com/prometheus) are not affected.
For more information
If you have any questions or comments about this advisory, please use our community channels (https://prometheus.io/community). Our security policy is available at https://prometheus.io/docs/operating/security/
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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