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).
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.22%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 1.22% probability · 67th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-347
- Affected
- pysaml2 project/pysaml2 · canonical/ubuntu linux · debian/debian linux
- Source
- cve@mitre.org
References
- https://github.com/IdentityPython/pysaml2/commit/5e9d5acbcd8ae45c4e736ac521fd2df5b1c62e25Patch, Third Party Advisory
- https://github.com/IdentityPython/pysaml2/commit/f27c7e7a7010f83380566a219fd6a290a00f2b6ePatch, Third Party Advisory
- https://github.com/IdentityPython/pysaml2/releasesRelease Notes, Third Party Advisory
- https://github.com/IdentityPython/pysaml2/releases/tag/v5.0.0Release Notes, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/02/msg00025.htmlMailing List, Third Party Advisory
- https://pypi.org/project/pysaml2/5.0.0/Product, Third Party Advisory
- https://usn.ubuntu.com/4245-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4630Third Party Advisory
- https://github.com/IdentityPython/pysaml2/commit/5e9d5acbcd8ae45c4e736ac521fd2df5b1c62e25Patch, Third Party Advisory
- https://github.com/IdentityPython/pysaml2/commit/f27c7e7a7010f83380566a219fd6a290a00f2b6ePatch, Third Party Advisory
- https://github.com/IdentityPython/pysaml2/releasesRelease Notes, Third Party Advisory
- https://github.com/IdentityPython/pysaml2/releases/tag/v5.0.0Release Notes, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/02/msg00025.htmlMailing List, Third Party Advisory
- https://pypi.org/project/pysaml2/5.0.0/Product, Third Party Advisory
- https://usn.ubuntu.com/4245-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4630Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.