CVE-2021-21350 XStream is vulnerable to an Arbitrary Code Execution attack
Remote attackers can execute arbitrary code via manipulated input streams in XStream unless a strict type whitelist is configured.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-21350?
CVE-2021-21350 is a medium-severity unsafe deserialization vulnerability in Apache Activemq, published on 22 Mar 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
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 execute arbitrary code 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.
Which versions are affected by CVE-2021-21350?
3 open source packages ship an affected version, including activemq and com.thoughtworks.xstream:xstream. It affects 16 products.
| Package | Affected | Fixed in |
|---|---|---|
activemq Bitnami | All versions to 5.16.0 | 5.15.14 |
com.thoughtworks.xstream:xstream Maven | All versions | 1.4.16 |
com.thoughtworks.xstream:xstream Maven | All versions | 1.4.16 |
Products include Apache Activemq, Apache Jmeter, Debian Debian Linux, Fedoraproject Fedora, Netapp Oncommand Insight, Oracle Banking Enterprise Default Management and 10 more.
How do I fix CVE-2021-21350?
Upgrade activemq to 5.15.14 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2021-21350 being exploited?
There is no known exploitation of CVE-2021-21350 in the wild and no public exploit code.
Other vulnerabilities in Apache Activemq
Sources
Also known as BIT-activemq-2021-21350, DEBIAN-CVE-2021-21350, GHSA-43gc-mjxg-gvrq, UBUNTU-CVE-2021-21350.