Vulnerability in Pysaml2 Project
CVE-2020-5390
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.012 (67.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
- Pysaml2 Project
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.04
- Debian Linux — versions 8.0, 9.0, 10.0
Weakness classification (CWE)
References
- github.com/IdentityPython/pysaml2/commit/5e9d5acbcd8ae45c4e736ac521fd2df5b1c62e… (Patch, Third Party Advisory)
- github.com/IdentityPython/pysaml2/commit/f27c7e7a7010f83380566a219fd6a290a00f2b… (Patch, Third Party Advisory)
- github.com/IdentityPython/pysaml2/releases/tag/v5.0.0 (Third Party Advisory, Release Notes)
- github.com/IdentityPython/pysaml2/releases (Third Party Advisory, Release Notes)
- pypi.org/project/pysaml2/5.0.0/ (Product, Third Party Advisory)
- usn.ubuntu.com/4245-1/ (vendor-advisory, Third Party Advisory)
- www.debian.org/security/2020/dsa-4630 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2020/02/msg00025.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-5390?
- CVE-2020-5390 is a high-severity vulnerability in Pysaml2 Project, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2020-01-13.
- How severe is CVE-2020-5390?
- High severity. CVSS v3 base score is 7.5 out of 10.