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

This High severity software.amazon.ion:ion-java Dependency vulnerability was introduced in versions 7.21.0, 8.0.0, 8.1.0, 8.2.0, 8.3.0, 8.4.0, 8.5.0, 8.6.0, 8.7.0, 8.8.0, 8.9.0, 8.10.0, 8.11.0, 8.12.0, 8.13.0, 8.14.0-eap01, 8.15.0, 8.16.0, 8.17.0, and 8.18.0 of Bitbucket 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.

Atlassian recommends that Bitbucket Data Center and Server customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions:

||Affected versions||Fixed versions||
|8.18.0|8.19.0 (LTS) recommended or 8.18.1|
|8.17.0 to 8.17.1|8.19.0 (LTS) recommended or 8.17.2|
|8.16.0 to 8.16.2|8.19.0 (LTS) recommended or 8.16.3 or 8.16.4|
|8.15.0 to 8.15.3|8.19.0 (LTS) recommended or 8.15.4 or 8.15.5|
|8.14.0 to 8.14.4|8.19.0 (LTS) recommended or 8.14.5 or 8.14.6|
|8.13.0 to 8.13.5|8.19.0 (LTS) recommended or 8.13.6|
|8.12.0 to 8.12.3|8.19.0 (LTS) recommended|
|8.11.0 to 8.11.1|8.19.0 (LTS) recommended|
|8.10.0 to 8.10.1|8.19.0 (LTS) recommended|
|8.9.0 to 8.9.9 (LTS{}){}|8.9.10 (LTS) recommended or 8.9.10 (LTS) or 8.9.11 (LTS)|
|7.21.0 to 7.21.21|8.19.0 (LTS) recommended or 8.9.10 (LTS) or 8.9.11 (LTS) or 7.21.22|
|Any other/earlier versions|8.19.0 (LTS) recommended or 8.9.10 (LTS) or 8.9.10 (LTS)|

See the release notes ([https://confluence.atlassian.com/bitbucketserver/release-notes]). You can download the latest version of Bitbucket Data Center and Server from the download center ([https://www.atlassian.com/software/bitbucket/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.