xstreamproject xstream CVE-2021-21342 vulnerability in Xstreamproject and Other Products
Published on March 23, 2021

A 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

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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.

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Vulnerability Analysis

CVE-2021-21342 is exploitable with network access, requires user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
HIGH
Privileges Required:
NONE
User Interaction:
REQUIRED
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
HIGH
Availability Impact:
NONE

Weakness Types

What is a Marshaling, Unmarshaling Vulnerability?

The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.

CVE-2021-21342 has been classified to as a Marshaling, Unmarshaling vulnerability or weakness.

What is a SSRF Vulnerability?

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.

CVE-2021-21342 has been classified to as a SSRF vulnerability or weakness.


Products Associated with CVE-2021-21342

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2021-21342 are published in these products:

Xstreamproject Xstream
 
Debian Linux
 
Canonical Ubuntu Linux
 
Fedora Project Fedora
 
Oracle Banking Virtual Account Management
 
Oracle Communications Policy Management
 
Oracle MySQL
 
Oracle Banking Platform
 
Oracle Webcenter Portal
 
Oracle Communications Unified Inventory Management
 
Oracle Business Activity Monitoring
 
Oracle Retail Xstore Point Of Service
 
Oracle Banking Enterprise Default Management
 
Oracle Communications Brm Elastic Charging Engine
 
NetApp Oncommand Insight
 
Apache ActiveMQ
 
Apache JMeter
 
Xstream
 

Affected Versions

x-stream xstream Version < 1.4.16 is affected by CVE-2021-21342

Vulnerable Packages

The following package name and versions may be associated with CVE-2021-21342

Package Manager Vulnerable Package Versions Fixed In
maven com.thoughtworks.xstream:xstream < 1.4.16 1.4.16

Exploit Probability

EPSS
1.02%
Percentile
76.92%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.