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CVE-2020-5390

Published: 13/01/2020 Updated: 01/02/2023
CVSS v2 Base Score: 5 | Impact Score: 2.9 | Exploitability Score: 10
CVSS v3 Base Score: 7.5 | Impact Score: 3.6 | Exploitability Score: 3.9
VMScore: 445
Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N
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Vulnerability Summary

PySAML2 prior to 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.

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Vendor Advisories

Debian CVElist Bug Report Logs: python-pysaml2: CVE-2020-5390
Debian Bug report logs - #949322 python-pysaml2: CVE-2020-5390 Package: src:python-pysaml2; Maintainer for src:python-pysaml2 is Debian OpenStack <team+openstack@trackerdebianorg>; Reported by: Salvatore Bonaccorso <carnil@debianorg> Date: Sun, 19 Jan 2020 20:09:01 UTC Severity: grave Tags: security, upstream Fou ...
Ubuntu Security Notice: python-pysaml2 vulnerability
PySAML2 could be made to bypass signature verification with arbitrary data ...
Debian Security Advisories: DSA-4630-1 python-pysaml2 -- security update
It was discovered that pysaml2, a Python implementation of SAML to be used in a WSGI environment, was susceptible to XML signature wrapping attacks, which could result in a bypass of signature verification For the oldstable distribution (stretch), this problem has been fixed in version 300-5+deb9u1 For the stable distribution (buster), this pro ...

References

CWE-347https://github.com/IdentityPython/pysaml2/releases/tag/v5.0.0https://github.com/IdentityPython/pysaml2/commit/f27c7e7a7010f83380566a219fd6a290a00f2b6ehttps://pypi.org/project/pysaml2/5.0.0/https://github.com/IdentityPython/pysaml2/commit/5e9d5acbcd8ae45c4e736ac521fd2df5b1c62e25https://github.com/IdentityPython/pysaml2/releaseshttps://usn.ubuntu.com/4245-1/https://www.debian.org/security/2020/dsa-4630https://lists.debian.org/debian-lts-announce/2020/02/msg00025.htmlhttps://bugs.debian.org/cgi-bin/bugreport.cgi?bug=949322https://usn.ubuntu.com/4245-1/https://nvd.nist.gov
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