CVE-2020-36239 Deserialization in Jira Core Data Center
Attackers with network access to Ehcache ports can execute arbitrary code via deserialization due to missing authentication in Jira Data Center products.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-36239?
CVE-2020-36239 is a critical unsafe deserialization vulnerability in Atlassian Jira Data Center, published on 29 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Jira Data Center, Jira Core Data Center, Jira Software Data Center from version 6.3.0 before 8.5.16, from 8.6.0 before 8.13.8, from 8.14.0 before 8.17.0 and Jira Service Management Data Center from version 2.0.2 before 4.5.16, from version 4.6.0 before 4.13.8, and from version 4.14.0 before 4.17.0 exposed a Ehcache RMI network service which attackers, who can connect to the service, on port 40001 and potentially 40011[0][1], could execute arbitrary code of their choice in Jira through deserialization due to a missing authentication vulnerability. While Atlassian strongly suggests restricting access to the Ehcache ports to only Data Center instances, fixed versions of Jira will now require a shared secret in order to allow access to the Ehcache service. [0] In Jira Data Center, Jira Core Data Center, and Jira Software Data Center versions prior to 7.13.1, the Ehcache object port can be randomly allocated. [1] In Jira Service Management Data Center versions prior to 3.16.1, the Ehcache object port can be randomly allocated.
Which versions are affected by CVE-2020-36239?
It affects 3 products.
Products include Atlassian Jira Data Center, Atlassian Jira Service Desk, Atlassian Jira Service Management.
How do I fix CVE-2020-36239?
No fix has been published for CVE-2020-36239 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2020-36239 being exploited?
There is no known exploitation of CVE-2020-36239 in the wild and no public exploit code.
Other vulnerabilities in Atlassian Jira Data Center
Sources
Also known as GHSA-2xhw-jfhh-p475.