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.

References[email protected]


Source: MITRE

Published: 2020-12-16

Updated: 2021-04-13

Type: CWE-918

Risk Information

CVSS v2.0

Base Score: 5

Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3.0

Base Score: 7.7

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Impact Score: 4

Exploitability Score: 3.1

Severity: HIGH

Tenable Plugins

View all (4 total)

145542Ubuntu 18.04 LTS / 20.04 LTS : XStream vulnerabilities (USN-4714-1)NessusUbuntu Local Security Checks
145314openSUSE Security Update : xstream (openSUSE-2021-140)NessusSuSE Local Security Checks
144818Debian DSA-4828-1 : libxstream-java - security updateNessusDebian Local Security Checks
144681Debian DLA-2507-1 : libxstream-java security updateNessusDebian Local Security Checks