# CVE-2023-41900: jetty9: Jetty is a Java based web server and servlet engine

CVE-2023-41900 is fixed in jetty9 on 1 platform, first by DEBIAN-CVE-2023-41900, released September 15, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-41900
- Priority: Routine
- CVSS: 4.3 (medium)
- EPSS: 0.0091
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 15, 2023

## Description

Jetty is a Java based web server and servlet engine. Versions 9.4.21 through 9.4.51, 10.0.15, and 11.0.15 are vulnerable to weak authentication. If a Jetty `OpenIdAuthenticator` uses the optional nested `LoginService`, and that `LoginService` decides to revoke an already authenticated user, then the current request will still treat the user as authenticated. The authentication is then cleared from the session and subsequent requests will not be treated as authenticated. So a request on a previously authenticated session could be allowed to bypass authentication after it had been rejected by the `LoginService`. This impacts usages of the jetty-openid which have configured a nested `LoginService` and where that `LoginService` will is capable of rejecting previously authenticated users. Versions 9.4.52, 10.0.16, and 11.0.16 have a patch for this issue.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | jetty9 Debian 12.15 (bookworm) | 9.4.50-4+deb12u1 | [DEBIAN-CVE-2023-41900](https://patchblox.com/security/data/fix/linux/debian-cve-2023-41900.md) | Sep 15, 2023 |
| Linux | jetty9 Debian 13.5 (trixie) | 9.4.52-1 | [DEBIAN-CVE-2023-41900](https://patchblox.com/security/data/fix/linux/debian-cve-2023-41900.md) | Sep 15, 2023 |
| Linux | jetty9 Debian 14 | 9.4.52-1 | [DEBIAN-CVE-2023-41900](https://patchblox.com/security/data/fix/linux/debian-cve-2023-41900.md) | Sep 15, 2023 |

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