x-stream · xstream
XStream, a Java library for serializing objects to XML and back, contains a flaw in versions before 1.4.16 that allows deserialization-driven remote command execution on the host. An attacker with sufficient rights who can supply a crafted input stream over the network can trigger this, though it requires user interaction, a high-complexity condition, and does not affect deployments that use an explicit whitelist of minimal required types.
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 who has sufficient rights to execute commands of the host 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.
Disclosed on 22 Mar 2021. No public exploit code or confirmed exploitation is recorded.
No ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.
1 package in 1 ecosystem. Main package: com.thoughtworks.xstream:xstream.
Upgrade to 1.4.18 or later
Fixes this CVE and 12 other known vulnerabilities in this package (CVE-2013-7285, CVE-2019-10173, +10).
Set the version to 1.4.18 or later in your pom.xml or build.gradle.
First fixed in 1.4.16 for CVE-2021-21345.
| If you run | Upgrade to |
|---|---|
| All versions before 1.4.16 | 1.4.18first fix for this CVE: 1.4.16 |
“Up to” means the second version is the fix and is not affected.