Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS1qNHFmLTN3MzMtOGNnY84AATev

SimpleSAMLphp Signature validation bypass

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.

Permalink: https://github.com/advisories/GHSA-j4qf-3w33-8cgc
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1qNHFmLTN3MzMtOGNnY84AATev
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 2 years ago
Updated: 7 months ago

CVSS Score: 8.1
CVSS vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Identifiers: GHSA-j4qf-3w33-8cgc, CVE-2017-18122
References:

• https://nvd.nist.gov/vuln/detail/CVE-2017-18122
• https://lists.debian.org/debian-lts-announce/2018/02/msg00008.html
• https://simplesamlphp.org/security/201710-01
• https://www.debian.org/security/2018/dsa-4127
• https://github.com/simplesamlphp/simplesamlphp/commit/e2d53086abbb253efb24ddcb49b116246eb0b6ca
• https://github.com/FriendsOfPHP/security-advisories/blob/master/simplesamlphp/simplesamlphp/CVE-2017-18122.yaml
• https://github.com/advisories/GHSA-j4qf-3w33-8cgc

Repository: https://github.com/simplesamlphp/simplesamlphp
Blast Radius: 20.3

Affected Packages