CVE-2020-26258

Published: 16 December 2020

XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.15, a Server-Side Forgery Request vulnerability can be activated when unmarshalling. The vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.15. The reported vulnerability does not exist if running Java 15 or higher. No user is affected who followed the recommendation to setup XStream's Security Framework with a whitelist! Anyone relying on XStream's default blacklist can immediately switch to a whilelist for the allowed types to avoid the vulnerability. Users of XStream 1.4.14 or below who still want to use XStream default blacklist can use a workaround described in more detailed in the referenced advisories.

Priority

Medium

CVSS 3 base score: 7.7

Status

Package Release Status
libxstream-java
Launchpad, Ubuntu, Debian
Upstream
Released (1.4.15-1)
Ubuntu 21.10 (Impish Indri) Not vulnerable
(1.4.15-1)
Ubuntu 21.04 (Hirsute Hippo) Not vulnerable
(1.4.15-1)
Ubuntu 20.04 LTS (Focal Fossa)
Released (1.4.11.1-1ubuntu0.1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (1.4.11.1-1~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(end of standard support, was needs-triage)
Ubuntu 14.04 ESM (Trusty Tahr) Needs triage