ESB-2020.3007 – [Linux][Ubuntu] ark: Create arbitrary files – Remote with user interaction

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3007
                       USN-4482-1: Ark vulnerability
                             2 September 2020

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

Product:           ark
Publisher:         Ubuntu
Operating System:  Ubuntu
                   Linux variants
Impact/Access:     Create Arbitrary Files -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-24654  

Original Bulletin: 
   https://usn.ubuntu.com/4482-1/

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running ark check for an updated version of the software for their 
         operating system.

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USN-4482-1: Ark vulnerability
01 September 2020

Ark could be made to write files as your login if it opened a specially
crafted file.
Releases

  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS

Packages

  o ark - archive utility

Details

Fabian Vogt discovered that Ark incorrectly handled symbolic links in
tar archive files. An attacker could use this to construct a malicious
tar archive that, when opened, would create files outside the extraction
directory.

Update instructions

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

Ubuntu 20.04

  o ark - 4:19.12.3-0ubuntu1.2

Ubuntu 18.04

  o ark - 4:17.12.3-0ubuntu1.2

Ubuntu 16.04

  o ark - 4:15.12.3-0ubuntu1.2

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

References

  o CVE-2020-24654

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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