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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.1902
                      USN-4974-1: Lasso vulnerability
                                2 June 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Lasso
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Provide Misleading Information -- Existing Account
                   Unauthorised Access            -- Existing Account
                   Reduced Security               -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-28091  

Reference:         ESB-2021.1895

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-4974-1

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USN-4974-1: Lasso vulnerability
02 June 2021

Applications using Lasso could be made to allow unintended access.
Releases

  o Ubuntu 21.04
  o Ubuntu 20.10
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS

Packages

  o lasso - Liberty Alliance and SAML protocol Library

Details

It was discovered that Lasso did not properly verify that all
assertions in a SAML response were properly signed. An attacker
could possibly use this to impersonate users or otherwise bypass
access controls.

Update instructions

The problem can be corrected by updating your system to the following package
versions:

Ubuntu 21.04

  o liblasso-perl - 2.6.1-2ubuntu0.1
  o liblasso3 - 2.6.1-2ubuntu0.1
  o python3-lasso - 2.6.1-2ubuntu0.1

Ubuntu 20.10

  o liblasso-perl - 2.6.0-7ubuntu2.1
  o liblasso3 - 2.6.0-7ubuntu2.1
  o python3-lasso - 2.6.0-7ubuntu2.1

Ubuntu 20.04

  o liblasso-perl - 2.6.0-7ubuntu1.2
  o liblasso3 - 2.6.0-7ubuntu1.2
  o python3-lasso - 2.6.0-7ubuntu1.2

Ubuntu 18.04

  o liblasso-perl - 2.5.1-0ubuntu1.2
  o liblasso3 - 2.5.1-0ubuntu1.2
  o python-lasso - 2.5.1-0ubuntu1.2
  o python3-lasso - 2.5.1-0ubuntu1.2

After a standard system update you need to restart applications that use
Lasso to make all the necessary changes.

References

  o CVE-2021-28091

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