high7.5
CVE-2020-5390
Improper Verification of Cryptographic Signature in PySAML2
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pysaml2 | < 5.0.0 | 5.0.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pysaml2 Project | Pysaml2 | before 5.0.0 |
| Canonical | Ubuntu Linux | Versions 16.04, 18.04, 19.04, 19.10 |
| Debian | Debian Linux | Versions 8.0, 9.0, 10.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- 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
- https://github.com/advisories/GHSA-qf7v-8hj3-4xw7
- https://nvd.nist.gov/vuln/detail/CVE-2020-5390
- https://github.com/IdentityPython/pysaml2/blob/master/CHANGELOG.md#500-2020-01-13
- https://github.com/pypa/advisory-database/tree/main/vulns/pysaml2/PYSEC-2020-94.yaml
- https://pypi.org/project/pysaml2/5.0.0
- https://usn.ubuntu.com/4245-1