National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2017-18122 Detail

Current 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.

Source:  MITRE
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 8.1 HIGH
Vector: AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H (V3 legend)
Impact Score: 5.9
Exploitability Score: 2.2


Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 6.8 MEDIUM
Vector: (AV:N/AC:M/Au:N/C:P/I:P/A:P) (V2 legend)
Impact Subscore: 6.4
Exploitability Subscore: 8.6


Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (AU): None
Confidentiality (C): Partial
Integrity (I): Partial
Availability (A): Partial
Additional Information:
Allows unauthorized disclosure of information
Allows unauthorized modification
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://lists.debian.org/debian-lts-announce/2018/02/msg00008.html Mailing List Third Party Advisory
https://simplesamlphp.org/security/201710-01 Patch Vendor Advisory
https://www.debian.org/security/2018/dsa-4127 Third Party Advisory

Technical Details

Vulnerability Type (View All)

  • Improper Verification of Cryptographic Signature (CWE-347)

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:a:simplesamlphp:simplesamlphp:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (including)
1.14.16

Configuration 2 ( hide )
 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
     Show Matching CPE(s)


Change History

4 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2017-18122
NVD Published Date:
02/02/2018
NVD Last Modified:
05/13/2019