| Name | CVE-2021-21238 |
| Description | PySAML2 is a pure python implementation of SAML Version 2 Standard. PySAML2 before 6.5.0 has an improper verification of cryptographic signature vulnerability. All users of pysaml2 that need to validate signed SAML documents are impacted. The vulnerability is a variant of XML Signature wrapping because it did not validate the SAML document against an XML schema. This allowed invalid XML documents to be processed and such a document can trick pysaml2 with a wrapped signature. This is fixed in PySAML2 6.5.0. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 980773 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| python-pysaml2 (PTS) | jessie, jessie (lts) | 2.0.0-1+deb8u4 | vulnerable |
| stretch (security), stretch (lts), stretch | 3.0.0-5+deb9u2 | vulnerable |
| buster, buster (security) | 4.5.0-4+deb10u1 | vulnerable |
| bullseye | 6.5.1-1 | fixed |
| bookworm | 7.0.1-2 | fixed |
| trixie, sid | 7.4.2-4 | fixed |
The information below is based on the following data on fixed versions.
Notes
[buster] - python-pysaml2 <no-dsa> (Minor issue)
[stretch] - python-pysaml2 <ignored> (python3-xmlschema not available in stretch for fix)
https://github.com/IdentityPython/pysaml2/security/advisories/GHSA-f4g9-h89h-jgv9
https://github.com/IdentityPython/pysaml2/commit/3b707723dcf1bf60677b424aac398c0c3557641d
[jessie] - python-pysaml2 <ignored> (python-xmlschema not available)