| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/prometheus/prometheus | < 0.311.3 | 0.311.3 |
| prometheus | ≥ 2.49.0, < 3.5.3≥ 3.6.0, < 3.11.3 | 3.5.33.11.3 |
In the Prometheus server's legacy web UI (enabled via the command-line flag --enable-feature=old-ui), the histogram heatmap chart view does not escape le label values when inserting them into the HTML for use as axis tick mark labels.
An attacker who can inject crafted metrics (e.g. via a compromised scrape target, remote write, or OTLP receiver endpoint) can execute JavaScript in the browser of any Prometheus user who views the metric in the heatmap chart UI. From the XSS context, an attacker could for example:
/api/v1/status/config to extract sensitive configuration (although credentials / secrets are redacted by the server)/-/quit to shut down Prometheus (only if --web.enable-lifecycle is set)/api/v1/admin/tsdb/delete_series to delete data (only if --web.enable-admin-api is set)Note that this only affects users who have explicitly enabled the legacy Prometheus web UI using the --enable-feature=old-ui command-line flag.
https://github.com/prometheus/prometheus/commit/38f23b9075ced1de2b82d2dad8b2bebb1ecd5b7d
If at all possible, disable the legacy web UI by removing the --enable-feature=old-ui command-line flag).
If this is not an option, take the following precautions:
--web.enable-remote-write-receiver), ensure it is not exposed to untrusted sources.--web.enable-otlp-receiver), ensure it is not exposed to untrusted sources.--web.enable-admin-api or web.enable-lifecycle) in cases where you cannot prevent untrusted data from being ingested.label_replace, as they may generate poisoned label names and values.Running one of these products? Scan your site to see whether it exposes a vulnerable version.
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