CVE-2021-21349 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
Remote attackers can trigger Server-Side Request Forgery via XStream deserialization to access internal resources if security whitelists are not 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-2021-21349?
CVE-2021-21349 is a medium-severity server-side request forgery 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 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.
Which versions are affected by CVE-2021-21349?
3 open source packages ship an affected version, including activemq and com.thoughtworks.xstream:xstream. It affects 17 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 11 more.
How do I fix CVE-2021-21349?
Upgrade activemq to 5.15.14 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2021-21349 being exploited?
There is no known exploitation of CVE-2021-21349 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Apache Activemq
Sources
Also known as BIT-activemq-2021-21349, DEBIAN-CVE-2021-21349, GHSA-f6hm-88x3-mfjv, UBUNTU-CVE-2021-21349.