CVE-2017-18122

NONE EPSS 62.1%
Published Feb 2, 20188y ago · Modified Jun 17, 20262w ago
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Published Feb 2, 2018 8y ago
Last Modified Jun 17, 2026 2w ago

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.

Threat Intelligence

EPSS Exploit Probability
62.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-347

Affected Products 4

VendorProductVersionRange
simplesamlphpsimplesamlphp* ≤1.14.16
debiandebian_linux7.0any
debiandebian_linux8.0any
debiandebian_linux9.0any

References 3

  • lists.debian.org https://lists.debian.org/debian-lts-announce/2018/02/msg00008.html
    Mailing ListThird Party Advisory
  • simplesamlphp.org https://simplesamlphp.org/security/201710-01
    PatchVendor Advisory
  • debian.org https://www.debian.org/security/2018/dsa-4127
    Third Party Advisory

Remediation