DoS (Denial of Service) software.amazon.ion:ion-java Dependency in Confluence Data Center and Server

This High severity software.amazon.ion:ion-java Dependency vulnerability was introduced in versions 5.6 of Confluence Data Center and Server.

This software.amazon.ion:ion-java Dependency vulnerability, with a CVSS Score of 7.5 and a CVSS Vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H allows an unauthenticated attacker to expose assets in your environment susceptible to exploitation which has no impact to confidentiality, no impact to integrity, high impact to availability, and requires no user interaction.
h2. Data Center

Atlassian recommends that Confluence Data Center customers upgrade to the latest version. If you are unable to do so, upgrade your instance to one of the specified supported fixed versions:

||Affected versions||Fixed versions||
|from 8.6.0 to 8.8.1|8.9.0 recommended|
|from 8.5.0 to 8.5.6 LTS|8.9.0 or 8.5.7 LTS recommended|
|from 8.4.0 to 8.4.5|8.9.0 or 8.5.7 LTS recommended|
|from 8.3.0 to 8.3.4|8.9.0 or 8.5.7 LTS recommended|
|from 8.2.0 to 8.2.3|8.9.0 or 8.5.7 LTS recommended|
|from 8.1.0 to 8.1.4|8.9.0 or 8.5.7 LTS recommended|
|from 8.0.0 to 8.0.4|8.9.0 or 8.5.7 LTS recommended|
|from 7.20.0 to 7.20.3|8.9.0 or 8.5.7 LTS recommended|
|from 7.19.0 to 7.19.19 LTS|8.9.0 or 8.5.7 LTS recommended or 7.19.20 LTS|
|from 7.18.0 to 7.18.3|8.9.0 or 8.5.7 LTS recommended or 7.19.20 LTS|
|from 7.17.0 to 7.17.5|8.9.0 or 8.5.7 LTS recommended or 7.19.20 LTS|
|Any earlier versions|8.9.0 or 8.5.7 LTS recommended or 7.19.20 LTS|
h2. Server

{color:#172b4d}Atlassian recommends that Confluence Server customers upgrade to the latest 8.5.x LTS version. If you are unable to do so, upgrade your instance to one of the specified supported fixed versions:{color}

||Affected versions||Fixed versions||
|from 8.5.0 to 8.5.6|8.5.7 LTS recommended|
|from 8.4.0 to 8.4.5|8.5.7 LTS recommended|
|from 8.3.0 to 8.3.4|8.5.7 LTS recommended|
|from 8.2.0 to 8.2.3|8.5.7 LTS recommended|
|from 8.1.0 to 8.1.4|8.5.7 LTS recommended|
|from 8.0.0 to 8.0.4|8.5.7 LTS recommended|
|from 7.20.0 to 7.20.3|8.5.7 LTS recommended|
|from 7.19.0 to 7.19.19 LTS|8.5.7 LTS recommended or 7.19.20 LTS|
|from 7.18.0 to 7.18.3|8.5.7 LTS recommended or 7.19.20 LTS|
|from 7.17.0 to 7.17.5|8.5.7 LTS recommended or 7.19.20 LTS|
|Any earlier versions|8.5.7 LTS recommended or 7.19.20 LTS|

See the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]). You can download the latest version of Confluence Data Center and Server from the download center ([https://www.atlassian.com/software/confluence/download-archives]).

The National Vulnerability Database provides the following description for this vulnerability: Amazon Ion is a Java implementation of the Ion data notation. Prior to version 1.10.5, a potential denial-of-service issue exists in ion-java for applications that use ion-java to deserialize Ion text encoded data, or deserialize Ion text or binary encoded data into the IonValue model and then invoke certain IonValue methods on that in-memory representation. An actor could craft Ion data that, when loaded by the affected application and/or processed using the IonValue model, results in a StackOverflowError originating from the ion-java library. The patch is included in ion-java 1.10.5. As a workaround, do not load data which originated from an untrusted source or that could have been tampered with.