CVE-2016-4000 Deserialization of Untrusted Data in Jython
Attackers can execute arbitrary code by sending a crafted serialized PyFunction object to applications using the Jython library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-4000?
CVE-2016-4000 is a critical unsafe deserialization vulnerability in Debian Debian Linux, published on 6 Jul 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Jython before 2.7.1rc1 allows attackers to execute arbitrary code via a crafted serialized PyFunction object.
Weakness: CWE-502
Which versions are affected by CVE-2016-4000?
4 open source packages ship an affected version, including org.python:jython and org.python:jython-standalone. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
org.python:jython Maven | All versions | 2.7.1b3 |
org.python:jython Maven | All versions | 2.7.1b3 |
org.python:jython-standalone Maven | All versions | 2.7.1b3 |
org.python:jython-standalone Maven | All versions | 2.7.1b3 |
Products include Debian Debian Linux, Jython Project Jython.
How do I fix CVE-2016-4000?
Upgrade org.python:jython to 2.7.1b3 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2016-4000 being exploited?
There is no known exploitation of CVE-2016-4000 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2016-4000, DLA-989-1, DSA-3893-1, GHSA-6r7r-jj8h-pq6v, UBUNTU-CVE-2016-4000.