Server-Side Request Forgery (SSRF) Affecting libxstream-java package, versions <1.4.11.1-1ubuntu0.1


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

Exploit Maturity
Proof of concept
EPSS
82.96% (99th percentile)

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  • Snyk IDSNYK-UBUNTU2004-LIBXSTREAMJAVA-1065943
  • published29 Jan 2021
  • disclosed16 Dec 2020

Introduced: 16 Dec 2020

CVE-2020-26258  (opens in a new tab)
CWE-918  (opens in a new tab)

How to fix?

Upgrade Ubuntu:20.04 libxstream-java to version 1.4.11.1-1ubuntu0.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libxstream-java package and not the libxstream-java package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

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.

CVSS Scores

version 3.1