GHSA-qf7v-8hj3-4xw7
Improper Verification of Cryptographic Signature in PySAML2
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
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 assertions that have been signed.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2020-5390
- https://github.com/IdentityPython/pysaml2/commit/5e9d5acbcd8ae45c4e736ac521fd2df5b1c62e25
- https://github.com/IdentityPython/pysaml2/commit/f27c7e7a7010f83380566a219fd6a290a00f2b6e
- https://github.com/IdentityPython/pysaml2
- https://github.com/IdentityPython/pysaml2/blob/master/CHANGELOG.md#500-2020-01-13
- https://github.com/IdentityPython/pysaml2/releases
- https://github.com/IdentityPython/pysaml2/releases/tag/v5.0.0
- https://github.com/advisories/GHSA-qf7v-8hj3-4xw7
- https://github.com/pypa/advisory-database/tree/main/vulns/pysaml2/PYSEC-2020-94.yaml
- 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