CVE-2021-39145: XStream is vulnerable to an Arbitrary Code Execution attack
A flaw was found in xstream, a simple library used to serialize objects to XML and back again. This flaw allows a remote attacker to load and execute arbitrary code from a remote host by manipulating the processed input stream. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
Other sources
XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to load and execute arbitrary code from a remote 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. XStream 1.4.18 uses no longer a blacklist by default, since it cannot be secured for general purpose.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
redhat/xstreamto a version that resolves this vulnerability.Fixed in 0:1.3.1-16.el7_9 - Upgrade
Upgrade
debian/libxstream-javato a version that resolves this vulnerability.Fixed in 1.4.11.1-1+deb10u3Fixed in 1.4.11.1-1+deb10u4Fixed in 1.4.15-3+deb11u2Fixed in 1.4.20-1 - Upgrade
Upgrade
redhat/xstreamto a version that resolves this vulnerability.Fixed in 1.4.18 - Configuration
Set up XStream's security framework and configure a whitelist limited to the minimal required types (per the recommendation in the advisory text).
XStream XStream security framework (type whitelist) = whitelist limited to the minimal required types
Event History
Parent advisories
This vulnerability appears in the following advisories.
Frequently Asked Questions
What is the vulnerability ID for this flaw?
The vulnerability ID for this flaw is CVE-2021-39145.
What is the severity of CVE-2021-39145?
The severity of CVE-2021-39145 is high with a CVSS score of 8.5.
What is the affected software for CVE-2021-39145?
The affected software for CVE-2021-39145 is xstream versions up to 1.4.18.
How can a remote attacker exploit this vulnerability?
A remote attacker can exploit this vulnerability by manipulating the processed input stream, allowing them to load and execute arbitrary code from a remote host.
How can this vulnerability be fixed?
To fix CVE-2021-39145, it is recommended to update xstream to version 1.4.18 or higher.