xstreamproject xstream CVE-2021-39150 vulnerability in Xstreamproject and Other Products
Published on August 23, 2021

A Server-Side Forgery Request vulnerability in XStream via PriorityQueue unmarshaling

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XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream with a Java runtime version 14 to 8. 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](https://x-stream.github.io/security.html#framework), you will have to use at least version 1.4.18.

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Vulnerability Analysis

CVE-2021-39150 is exploitable with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

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

Weakness Types

What is a Marshaling, Unmarshaling Vulnerability?

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

CVE-2021-39150 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-2021-39150 has been classified to as a SSRF vulnerability or weakness.


Products Associated with CVE-2021-39150

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2021-39150 are published in these products:

Xstreamproject Xstream
 
Debian Linux
 
Fedora Project Fedora
 
NetApp Snapmanager
 
Oracle Business Activity Monitoring
 
Oracle Communications Billing Revenue Management Elastic Charging Engine
 
Oracle Communications Cloud Native Core Binding Support Function
 
Oracle Communications Cloud Native Core Policy
 
Oracle Communications Unified Inventory Management
 
Oracle Utilities Framework
 
Oracle Utilities Testing Accelerator
 
Oracle Webcenter Portal
 
Oracle Commerce Guided Search
 
Oracle Retail Xstore Point Of Service
 
Oracle Communications Cloud Native Core Automated Test Suite
 
Canonical Ubuntu Linux
 
Xstream
 

Affected Versions

x-stream xstream Version < 1.4.18 is affected by CVE-2021-39150

Vulnerable Packages

The following package name and versions may be associated with CVE-2021-39150

Package Manager Vulnerable Package Versions Fixed In
maven com.thoughtworks.xstream:xstream < 1.4.18 1.4.18

Exploit Probability

EPSS
2.02%
Percentile
83.48%

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.