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CONFLUENCE SECURITY ADVISORY 2022-06-02

CONFLUENCE SECURITY OVERVIEW AND ADVISORIES

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CONFLUENCE SERVER AND DATA CENTER - CVE-2022-26134 - CRITICAL SEVERITY
UNAUTHENTICATED REMOTE CODE EXECUTION VULNERABILITY




Update: This advisory has been updated since its original publication.

Specific updates include: 

03 Jun 2022 4 PM PDT (Pacific Time, -7 hours)

 * Updated to clarify limitation with rolling upgrades in the What You Need to
   Do section.

03 Jun 2022 10 AM PDT (Pacific Time, -7 hours)

 * Updated with the fixed versions

 * Removed interim advice about adding a WAF rule from the What You Need to Do
   section

03 Jun 2022 8 AM PDT (Pacific Time, -7 hours) 

 * Updating mitigation information to include replacement jar and class files

03 Jun 2022 


 * Clarifying the affected versions

 * Adding a WAF rule to the What You Need to Do section

 * Adding estimated timeframe for fixes to be available

Summary

CVE-2022-26134 - Critical severity unauthenticated remote code execution
vulnerability in Confluence Server and Data Center

Advisory Release Date

02 Jun 2022 1 PM PDT (Pacific Time, -7 hours) 

Affected Products

 * Confluence
   
   * Confluence Server
   
   * Confluence Data Center

Affected Versions

 * All supported versions of Confluence Server and Data Center are affected.

 * Confluence Server and Data Center versions after 1.3.0 are affected.

Fixed Versions

 * 7.4.17

 * 7.13.7

 * 7.14.3

 * 7.15.2

 * 7.16.4

 * 7.17.4

 * 7.18.1

CVE ID(s)

CVE-2022-26134


SEVERITY

Atlassian rates the severity level of this vulnerability as critical, according
to the scale published in our Atlassian severity levels. The scale allows us to
rank the severity as critical, high, moderate or low.

This is our assessment and you should evaluate its applicability to your own IT
environment.


DESCRIPTION

Atlassian has been made aware of current active exploitation of a critical
severity unauthenticated remote code execution vulnerability in Confluence Data
Center and Server. The OGNL injection vulnerability allows an unauthenticated
user to execute arbitrary code on a Confluence Server or Data Center instance. 

All versions of Confluence Server and Data Center prior to the fixed versions
listed above are affected by this vulnerability.

This issue can be tracked here: 

CONFSERVER-79016 - Remote code execution via OGNL injection in Confluence Server
& Data Center - CVE-2022-26134 Published

Atlassian Cloud sites are protected

If your Confluence site is accessed via an atlassian.net domain, it is hosted by
Atlassian and is not vulnerable. Our investigations have not found any evidence
of exploitation of Atlassian Cloud.


FIX

We have taken the following steps to address this issue:

 * Released versions 7.4.17, 7.13.7, 7.14.3, 7.15.2, 7.16.4, 7.17.4 and
   7.18.1 which contain a fix for this issue.

What You Need to Do

Atlassian recommends that you upgrade to the latest Long Term Support release.
For a full description of the latest version, see the Confluence Server and Data
Center Release Notes. You can download the latest version from the download
centre.

Note: If you run Confluence in a cluster, you will not be able to upgrade to the
fixed versions without downtime, also known as a rolling upgrade. Follow the
steps in Upgrading Confluence Data Center.

MITIGATION

If you are unable to upgrade Confluence immediately, then as a temporary
workaround, you can mitigate the CVE-2022-26134 issue by updating the following
files for the specific version of the product.


FOR CONFLUENCE 7.15.0 - 7.18.0

If you run Confluence in a cluster, you will need to repeat this process on each
node. You don't need to shut down the whole cluster to apply this mitigation. 

 1. Shut down Confluence.
     

 2. Download the following 1 file to the Confluence server:
    
    * xwork-1.0.3-atlassian-10.jar
       

 3. Delete (or move the following JAR outside of the Confluence install
    directory):
    
    <confluence-install>/confluence/WEB-INF/lib/xwork-1.0.3-atlassian-8.jar
    
     Do not leave a copy of this old JAR in the directory.
     

 4. Copy the downloaded xwork-1.0.3-atlassian-10.jar into
    <confluence-install>/confluence/WEB-INF/lib/
     

 5. Check the permissions and ownership on the new xwork-1.0.3-atlassian-10.jar
    file matches the existing files in the same directory.
     

 6. Start Confluence.

Remember, If you run Confluence in a cluster, make sure you apply the above
update on all of your nodes.

FOR CONFLUENCE 7.0.0 - CONFLUENCE 7.14.2

If you run Confluence in a cluster, you will need to repeat this process on each
node. You don't need to shut down the whole cluster to apply this mitigation. 

 1. Shut down Confluence.
     

 2. Download the following 3 files to the Confluence server:
    
    * xwork-1.0.3-atlassian-10.jar
    
    * webwork-2.1.5-atlassian-4.jar
    
    * CachedConfigurationProvider.class
       

 3. Delete (or move the following JARs outside of the Confluence install
    directory):
     
    
    <confluence-install>/confluence/WEB-INF/lib/xwork-1.0.3.6.jar
    <confluence-install>/confluence/WEB-INF/lib/webwork-2.1.5-atlassian-3.jar
    
    Do not leave a copy of the old JARs in the directory.
     

 4. Copy the downloaded xwork-1.0.3-atlassian-10.jar into
    <confluence-install>/confluence/WEB-INF/lib/
     

 5. Copy the downloaded webwork-2.1.5-atlassian-4.jar into
    <confluence-install>/confluence/WEB-INF/lib/
     

 6. Check the permissions and ownership on both new files matches the existing
    files in the same directory.
     

 7. Change to directory
    <confluence-install>/confluence/WEB-INF/classes/com/atlassian/confluence/setup
     
    
    1. Create a new directory called webwork
    
    2. Copy CachedConfigurationProvider.class into
       <confluence-install>/confluence/WEB-INF/classes/com/atlassian/confluence/setup/webwork
    
    3. Ensure the permissions and ownership are correct for:
       
       <confluence-install>/confluence/WEB-INF/classes/com/atlassian/confluence/setup/webwork
       
       <confluence-install>/confluence/WEB-INF/classes/com/atlassian/confluence/setup/webwork/CachedConfigurationProvider.class

 8. Start Confluence.

Remember, If you run Confluence in a cluster, make sure you apply the above
update on all of your nodes.




Note: Confluence End Of Life versions are not fully tested with the workaround.

We strongly recommend upgrading to a fixed version of Confluence as there are
several other security fixes included in the fixed versions of Confluence.


ACKNOWLEDGMENTS

We would like to thank Volexity for identifying this vulnerability.


SUPPORT

If you did not receive an email for this advisory and wish to receive such
emails in the future, please go to https://my.atlassian.com/email and subscribe
to Alerts emails.

If you have questions or concerns regarding this advisory, please raise a
support request at https://support.atlassian.com/.


REFERENCES

Security Bug fix Policy



As per our new policy critical security bug fixes will be back ported in
accordance with https://www.atlassian.com/trust/security/bug-fix-policy.  We
will release new maintenance releases for the versions covered by the policy
instead of binary patches.

Binary patches are no longer released. 

Severity Levels for security issues



Atlassian security advisories include a severity level and a CVE identifier.
This severity level is based on our self-calculated CVSS score for each specific
vulnerability. CVSS is an industry standard vulnerability metric. You can also
learn more about CVSS at FIRST.org.

End of Life Policy



 Our end of life policy varies for different products. Please refer to our EOL
Policy for details. 

Last modified on Jun 3, 2022


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