CVE-2020-5390
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 4.5.0-7 |
| sid | Fixed | 4.5.0-7 |
| forky | Fixed | 4.5.0-7 |
| bullseye | Fixed | 4.5.0-7 |
| bookworm | Fixed | 4.5.0-7 |
References
- 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
- https://pypi.org/project/pysaml2/5.0.0/
- https://usn.ubuntu.com/4245-1/
- https://www.suse.com/security/cve/CVE-2020-5390.html
- https://security-tracker.debian.org/tracker/CVE-2020-5390
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.