CVE-2020-35510 Uncontrolled Resource Consumption in jboss-remoting
An attacker can cause a denial of service in JBoss EJB servers by withholding ACK messages, leading to thread exhaustion and system unavailability.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-35510?
CVE-2020-35510 is a medium-severity denial of service vulnerability in jboss-remoting, published on 2 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw was found in jboss-remoting in versions before 5.0.20.SP1-redhat-00001. A malicious attacker could cause threads to hold up forever in the EJB server by writing a sequence of bytes corresponding to the expected messages of a successful EJB client request, but omitting the ACK messages, or just tamper with jboss-remoting code, deleting the lines that send the ACK message from the EJB client code resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Weakness: CWE-400
Which versions are affected by CVE-2020-35510?
2 open source packages ship an affected version, including org.jboss.remoting:jboss-remoting. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.jboss.remoting:jboss-remoting Maven | All versions | 5.0.20.Final |
org.jboss.remoting:jboss-remoting Maven | All versions | 5.0.20.Final |
Products include Redhat Jboss-Remoting.
How do I fix CVE-2020-35510?
Upgrade org.jboss.remoting:jboss-remoting to 5.0.20.Final or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-35510 being exploited?
There is no known exploitation of CVE-2020-35510 in the wild and no public exploit code.
Sources
Also known as GHSA-p6j8-hgv5-m35g.