Log in Start free

Vulnerability · Published Mar 22, 2021 · Assigned by GitHub_M

CVE-2021-21349A Server-Side Forgery Request can be activated unmarshalling with XStream to access data streams from an arbitrary URL referencing a resource in an intranet or the local host

Medium 6.1

In plain English

A medium-severity unsafe deserialization in xstream from x-stream. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 46.8% (higher than 99% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)46.8%top 1.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official description

XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream. 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libxstream-java1.4.15-2DEBIAN-CVE-2021-21349
Debian:13libxstream-java1.4.15-2DEBIAN-CVE-2021-21349
Debian:14libxstream-java1.4.15-2DEBIAN-CVE-2021-21349
Mavencom.thoughtworks.xstream:xstream1.4.16GHSA-f6hm-88x3-mfjv

Affected products (as reported)

VendorProductVersions
x-stream xstream < 1.4.16

Weakness: CWE-502, CWE-918 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N

References