CVE-2021-21238
Published: 21 January 2021
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.
Notes
| Author | Note |
|---|---|
| mdeslaur | Fixing this requires the python-xmlschema package, which is only available on hirsute. Backporting this fix to stable releases is intrusive and may introduce regressions. |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
python-pysaml2 Launchpad, Ubuntu, Debian |
bionic |
Needed
|
| focal |
Needed
|
|
| groovy |
Ignored
(end of life)
|
|
| hirsute |
Ignored
(end of life)
|
|
| impish |
Ignored
(end of life)
|
|
| jammy |
Needed
|
|
| kinetic |
Ignored
(end of life, was needed)
|
|
| lunar |
Not vulnerable
(7.1.0-0ubuntu2)
|
|
| mantic |
Not vulnerable
(7.1.0-0ubuntu2)
|
|
| noble |
Not vulnerable
(7.1.0-0ubuntu2)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(6.5.1-1)
|
|
| xenial |
Needed
|
|
|
Patches: upstream: https://github.com/IdentityPython/pysaml2/commit/1d8fd268f5bf887480a403a7a5ef8f048157cc14 upstream: https://github.com/IdentityPython/pysaml2/commit/3b707723dcf1bf60677b424aac398c0c3557641d |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | High |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |