Security readout for executives and security teams
Plain-English summary
CVE-2018-7644 affects SimpleSAMLphp before 1.15.3. A flaw in signature verification could let a remote attacker create a SAML assertion that appears valid and impersonate a user from an Identity Provider. For organizations relying on SAML single sign-on, this is an authentication bypass risk with potential account access impact.
Executive priority
Treat as high priority for any SimpleSAMLphp-backed SSO service. Successful exploitation could undermine login integrity and allow user impersonation. If SimpleSAMLphp is not used, business exposure is unlikely based on the provided sources.
Technical view
XmlSecLibs, as used by the saml2 library in SimpleSAMLphp before 1.15.3, incorrectly verifies signatures on SAML assertions. The CVE describes this as a key confusion issue, where a crafted assertion can pass as cryptographically valid on behalf of an Identity Provider.
Likely exposure
Exposure is likely limited to environments running SimpleSAMLphp before 1.15.3 that process SAML assertions through the affected saml2/XmlSecLibs path. The source bundle does not identify specific operating systems, packaged distributions, or downstream products.
Exploitation context
The issue is remotely triggerable according to the CVE description and affects authentication trust decisions. The provided sources do not state active exploitation, and this CVE is not marked as CISA KEV in the bundle.
Researcher notes
Public details identify a SAML assertion signature verification flaw and key confusion issue. The bundle does not include CVSS, CWE, exploit status, or affected downstream package details. Avoid assuming impact beyond SimpleSAMLphp before 1.15.3 without local dependency evidence.
Mitigation direction
- Upgrade SimpleSAMLphp to version 1.15.3 or later.
- Review the SimpleSAMLphp security advisory for vendor-specific guidance.
- Identify bundled or transitive SimpleSAMLphp deployments in applications.
- Prioritize systems handling SAML single sign-on for sensitive applications.
Validation and detection
- Inventory SimpleSAMLphp versions across production and identity infrastructure.
- Confirm affected systems are not running versions before 1.15.3.
- Verify SAML service providers using SimpleSAMLphp have been updated.
- Review authentication logs for unusual SAML-based impersonation indicators.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-7644 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://simplesamlphp.org/security/201802-01CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.