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             AUSCERT External Security Bulletin Redistribution

 Drupal core - Critical - Arbitrary PHP code execution - SA-CORE-2020-013
                             26 November 2020


        AusCERT Security Bulletin Summary

Product:           Drupal
Publisher:         Drupal
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Modify Arbitrary Files          -- Existing Account
                   Access Confidential Data        -- Existing Account
                   Reduced Security                -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-28949 CVE-2020-28948 

Reference:         ESB-2020.4163

Original Bulletin: 

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Drupal core - Critical - Arbitrary PHP code execution - SA-CORE-2020-013

Project: Drupal core
Date: 2020-November-25
Security risk: 
Critical: 18/25 AC:Complex/A:User/CI:All/II:All/E:Exploit/TD:Uncommon
Vulnerability: Arbitrary PHP code execution

The Drupal project uses the PEAR Archive_Tar library. The PEAR Archive_Tar
library has released a security update that impacts Drupal. For more
information please see:

  * CVE-2020-28948
  * CVE-2020-28949

Multiple vulnerabilities are possible if Drupal is configured to allow .tar,
.tar.gz, .bz2 or .tlz file uploads and processes them.

To mitigate this issue, prevent untrusted users from uploading .tar, .tar.gz,
.bz2 or .tlz files.

This is a different issue than SA-CORE-2019-12, similar configuration changes
may mitigate the problem until you are able to patch.


Install the latest version:

  * If you are using Drupal 9.0, update to Drupal 9.0.9
  * If you are using Drupal 8.9, update to Drupal 8.9.10
  * If you are using Drupal 8.8 or earlier, update to Drupal 8.8.12
  * If you are using Drupal 7, update to Drupal 7.75

Versions of Drupal 8 prior to 8.8.x are end-of-life and do not receive security

According to the regular security release window schedule, November 25th would
not typically be a core security window. However, this release is necessary
because there are known exploits for one of core's dependencies and some
configurations of Drupal are vulnerable.

Reported By: 

  * Luke Stewart

Fixed By: 

  * Jess of the Drupal Security Team
  * Drew Webber of the Drupal Security Team
  * Michael Hess of the Drupal Security Team
  * Neil Drumm of the Drupal Security Team
  * Lee Rowlands of the Drupal Security Team

Contact and more information

The Drupal security team can be reached by email at security at drupal.org or
via the contact form.

Learn more about the Drupal Security team and their policies, writing secure
code for Drupal, and securing your site.

Follow the Drupal Security Team on Twitter @drupalsecurity

Contributing organizations for this advisory

  * Acquia
  * Drupal Association
  * PreviousNext
  * Fuzion

The security team is made up of volunteers around the world. The companies
above have sponsored time on this release.

Thank you to these Drupal contributors

Top Drupal contributor Acquia would like to thank their partners for their
contributions to Drupal.

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