ESB-2021.0325 – [Ubuntu] TCMU: Multiple vulnerabilities

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.0325
                      USN-4707-1: TCMU vulnerability
                              29 January 2021

===========================================================================

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

Product:           TCMU
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Modify Arbitrary Files   -- Existing Account
                   Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-3139 CVE-2020-28374 

Reference:         ESB-2021.0221
                   ESB-2021.0204

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-4707-1

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USN-4707-1: TCMU vulnerability
28 January 2021

tcmu could be made to crash if it received specially crafted
input.
Releases

  o Ubuntu 20.10
  o Ubuntu 20.04 LTS

Packages

  o tcmu - TCM-Userspace backend

Details

It was discovered that TCMU lacked a check for transport-layer restrictions,
allowing remote attackers to read or write files via directory traversal in
an XCOPY request.

Update instructions

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

Ubuntu 20.10

  o libtcmu2 - 1.5.2-5ubuntu0.20.10.1
  o tcmu-runner - 1.5.2-5ubuntu0.20.10.1

Ubuntu 20.04

  o libtcmu2 - 1.5.2-5ubuntu0.20.04.1
  o tcmu-runner - 1.5.2-5ubuntu0.20.04.1

In general, a standard system update will make all the necessary changes.

References

  o CVE-2021-3139

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