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CVE-2021-21342

Published: 23 March 2021

XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability where the processed stream at unmarshalling time contains type information to recreate the formerly written objects. XStream creates therefore new instances based on these type information. An attacker can manipulate the processed input stream and replace or inject objects, that result in a server-side forgery request. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.

Priority

Medium

Cvss 3 Severity Score

9.1

Score breakdown

Status

Package Release Status
libxstream-java
Launchpad, Ubuntu, Debian
kinetic
Released (1.4.15-2)
impish
Released (1.4.15-2)
trusty Needed

upstream
Released (1.4.16)
bionic
Released (1.4.11.1-1~18.04.2)
focal
Released (1.4.11.1-1ubuntu0.2)
groovy
Released (1.4.11.1-2ubuntu0.1)
hirsute
Released (1.4.15-1ubuntu0.1)
xenial Needed

jammy
Released (1.4.15-2)
lunar
Released (1.4.15-2)
mantic
Released (1.4.15-2)

Severity score breakdown

Parameter Value
Base score 9.1
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N