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CVE-2017-18122

Published: 2 February 2018

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.

Priority

Medium

Cvss 3 Severity Score

8.1

Score breakdown

Status

Package Release Status
simplesamlphp
Launchpad, Ubuntu, Debian
impish Not vulnerable
(1.15.2-1)
hirsute Not vulnerable
(1.15.2-1)
xenial Needed

kinetic Not vulnerable
(1.15.2-1)
lunar Not vulnerable
(1.15.2-1)
artful Ignored
(end of life)
bionic Not vulnerable
(1.15.2-1)
cosmic Not vulnerable
(1.15.2-1)
disco Not vulnerable
(1.15.2-1)
eoan Not vulnerable
(1.15.2-1)
focal Not vulnerable
(1.15.2-1)
groovy Not vulnerable
(1.15.2-1)
jammy Not vulnerable
(1.15.2-1)
trusty Does not exist
(trusty was needed)
upstream
Released (1.15.0-1)
mantic Not vulnerable
(1.15.2-1)

Severity score breakdown

Parameter Value
Base score 8.1
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H