CVE-2023-40577: Alertmanager UI is vulnerable to stored XSS via the /api/v1/alerts endpoint
First published: Wed Aug 23 2023(Updated: )
### Impact An attacker with the permission to perform POST requests on the /api/v1/alerts endpoint could be able to execute arbitrary JavaScript code on the users of Prometheus Alertmanager. ### Patches Users can upgrade to Alertmanager v0.2.51. ### Workarounds Users can setup a reverse proxy in front of the Alertmanager web server to forbid access to the /api/v1/alerts endpoint. ### References N/A
Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Prometheus Alertmanager | =0.25.0 | |
| go/github.com/prometheus/alertmanager | <=0.25.0 | 0.25.1 |
| redhat/Alertmanager | <0.25.1 | 0.25.1 |
| debian/prometheus-alertmanager | <=0.21.0+ds-4<=0.25.0-1 | 0.27.0+ds-2 |
| ubuntu/prometheus-alertmanager | <0.6.2+ | 0.6.2+ |
| ubuntu/prometheus-alertmanager | <0.15.3+ | 0.15.3+ |
| ubuntu/prometheus-alertmanager | <0.23.0-4ubuntu0.2+ | 0.23.0-4ubuntu0.2+ |
| ubuntu/prometheus-alertmanager | <0.26.0+ | 0.26.0+ |
| Debian Linux | =10.0 |
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Reference Links
- https://github.com/prometheus/alertmanager/security/advisories/GHSA-v86x-5fm3-5p7j
- https://lists.debian.org/debian-lts-announce/2023/10/msg00011.html
- https://nvd.nist.gov/vuln/detail/CVE-2023-40577
- https://github.com/advisories/GHSA-v86x-5fm3-5p7j (Advisory)
- https://access.redhat.com/errata/RHSA-2023:7198
- https://bugzilla.redhat.com/show_bug.cgi?id=2235479
- https://launchpad.net/bugs/cve/CVE-2023-40577
- https://github.com/prometheus/alertmanager/commit/8b9f2fd20c25e0d1e76aa0b407f7e354996d8e72
- https://security-tracker.debian.org/tracker/CVE-2023-40577
- https://www.cve.org/CVERecord?id=CVE-2023-40577
- https://ubuntu.com/security/notices/USN-6935-1
- https://ubuntu.com/security/CVE-2023-40577
Frequently Asked Questions
What is the severity of CVE-2023-40577?
CVE-2023-40577 is considered a high severity vulnerability due to its potential for arbitrary JavaScript code execution.
How do I fix CVE-2023-40577?
To fix CVE-2023-40577, users should upgrade to Alertmanager version 0.25.1 or later.
What software is affected by CVE-2023-40577?
CVE-2023-40577 affects Prometheus Alertmanager versions up to and including 0.25.0.
Can I mitigate CVE-2023-40577 without upgrading?
Yes, users can implement workarounds such as restricting access to the /api/v1/alerts endpoint to limit exposure.
What type of attack does CVE-2023-40577 facilitate?
CVE-2023-40577 allows attackers to execute malicious JavaScript in the context of user sessions.
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