Rob Richards XmlSecLibs, all versions prior to v3.0.3, as used for example by SimpleSAMLphp, performed incorrect validation of cryptographic signatures in XML messages, allowing an authenticated attacker to impersonate others or elevate privileges by creating a crafted XML message.
https://github.com/robrichards/xmlseclibs/commit/0a53d3c3aa87564910cae4ed01416441d3ae0db5
https://lists.debian.org/debian-lts-announce/2019/11/msg00003.html
https://seclists.org/bugtraq/2019/Nov/8
https://simplesamlphp.org/security/201911-01
Source: MITRE
Published: 2019-11-07
Updated: 2020-08-24
Type: CWE-347
Base Score: 6.5
Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 8
Severity: MEDIUM
Base Score: 8.8
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 2.8
Severity: HIGH