CVE-2020-5390 Information

Description

PySAML2 before 5.0.0 does not check that the signature in a SAML document is enveloped and thus signature wrapping is effective i.e. it is affected by XML Signature Wrapping (XSW). The signature information and the node/object that is signed can be in different places and thus the signature verification will succeed but the wrong data will be used. This specifically affects the verification of assertion that have been signed.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

https://github.com/IdentityPython/pysaml2/commit/5e9d5acbcd8ae45c4e736ac521fd2df5b1c62e25 https://github.com/IdentityPython/pysaml2/commit/f27c7e7a7010f83380566a219fd6a290a00f2b6e https://github.com/IdentityPython/pysaml2/releases https://github.com/IdentityPython/pysaml2/releases/tag/v5.0.0 https://lists.debian.org/debian-lts-announce/2020/02/msg00025.html https://pypi.org/project/pysaml2/5.0.0/ https://usn.ubuntu.com/4245-1/ https://www.debian.org/security/2020/dsa-4630

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

7.5