---
title: "CVE-2017-18122\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2017-18122?format=md
keywords: index, follow
---

# CVE-2017-18122

Publication date 2 February 2018

Last updated 26 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**8.1 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2017-18122?format=md#impact-score)

Toggle side navigation

## Description

A signature-validation bypass issue was discovered in SimpleSAMLphp through
1.14.16. A SimpleSAMLphp Service Provider using SAML 1.1 will regard as
valid any unsigned SAML response containing more than one signed assertion,
provided that the signature of at least one of the assertions is valid.
Attributes contained in all the assertions received will be merged and the
entityID of the first assertion received will be used, allowing an attacker
to impersonate any user of any IdP given an assertion signed by the
targeted IdP.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| simplesamlphp | 26.04 LTS resolute | Not affected |
| 25.10 questing | Not affected |
| 25.04 plucky | Not affected |
| 24.10 oracular | Not affected |
| 24.04 LTS noble | Not affected |
| 23.10 mantic | Not affected |
| 23.04 lunar | Not affected |
| 22.10 kinetic | Not affected |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Not affected |
| 20.10 groovy | Not affected |
| 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 19.04 disco | Not affected |
| 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Not affected |
| 17.10 artful | Ignored end of life |
| 16.04 LTS xenial | Vulnerable |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

8.1 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | High |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.1 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-18122)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-18122)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-18122)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-18122)

### Other references

* <https://simplesamlphp.org/security/201710-01>
* <https://github.com/simplesamlphp/simplesamlphp/commit/e2d53086abbb253efb24ddcb49b116246eb0b6ca (v1.14.17)>
* <https://www.cve.org/CVERecord?id=CVE-2017-18122>