SB2018030515 - Improper Verification of Cryptographic Signature in SimpleSAMLphp SimpleSAMLphp
Published: March 5, 2018 Updated: July 17, 2020
Security Bulletin ID
SB2018030515
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper Verification of Cryptographic Signature (CVE-ID: CVE-2018-7644)
The vulnerability allows a remote non-authenticated attacker to manipulate data.
The XmlSecLibs library as used in the saml2 library in SimpleSAMLphp before 1.15.3 incorrectly verifies signatures on SAML assertions, allowing a remote attacker to construct a crafted SAML assertion on behalf of an Identity Provider that would pass as cryptographically valid, thereby allowing them to impersonate a user from that Identity Provider, aka a key confusion issue.
Remediation
Install update from vendor's website.