CVE-2020-11612 Denial of Service in Netty
An attacker can cause a denial of service by sending a large ZlibEncoded stream, forcing the Netty server to exhaust all available memory.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-11612?
CVE-2020-11612 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 7 Apr 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The ZlibDecoders in Netty 4.1.x before 4.1.46 allow for unbounded memory allocation while decoding a ZlibEncoded byte stream. An attacker could send a large ZlibEncoded byte stream to the Netty server, forcing the server to allocate all of its free memory to a single decoder.
Weakness: CWE-770
Which versions are affected by CVE-2020-11612?
2 open source packages ship an affected version, including io.netty:netty-handler. It affects 13 products.
| Package | Affected | Fixed in |
|---|---|---|
io.netty:netty-handler Maven | From 4.1.0 | 4.1.46 |
io.netty:netty-handler Maven | From 4.1.0 | 4.1.46 |
Linux distribution packages (38)
python-qpid-proton Red Hat:a_mq_clients:2::el6 | All versions | 0:0.31.0-3.el6_10 |
python-qpid-proton-docs Red Hat:a_mq_clients:2::el6 | All versions | 0:0.31.0-3.el6_10 |
qpid-cpp Red Hat:a_mq_clients:2::el6 | All versions | 0:1.36.0-30.el6_10amq |
qpid-cpp-client Red Hat:a_mq_clients:2::el6 | All versions | 0:1.36.0-30.el6_10amq |
qpid-cpp-client-devel Red Hat:a_mq_clients:2::el6 | All versions | 0:1.36.0-30.el6_10amq |
qpid-cpp-client-docs Red Hat:a_mq_clients:2::el6 | All versions | 0:1.36.0-30.el6_10amq |
qpid-cpp-debuginfo Red Hat:a_mq_clients:2::el6 | All versions | 0:1.36.0-30.el6_10amq |
qpid-proton Red Hat:a_mq_clients:2::el6 | All versions | 0:0.31.0-3.el6_10 |
qpid-proton-c Red Hat:a_mq_clients:2::el6 | All versions | 0:0.31.0-3.el6_10 |
qpid-proton-c-devel Red Hat:a_mq_clients:2::el6 | All versions | 0:0.31.0-3.el6_10 |
qpid-proton-c-docs Red Hat:a_mq_clients:2::el6 | All versions | 0:0.31.0-3.el6_10 |
qpid-proton-cpp Red Hat:a_mq_clients:2::el6 | All versions | 0:0.31.0-3.el6_10 |
qpid-proton-cpp-devel Red Hat:a_mq_clients:2::el6 | All versions | 0:0.31.0-3.el6_10 |
qpid-proton-cpp-docs Red Hat:a_mq_clients:2::el6 | All versions | 0:0.31.0-3.el6_10 |
qpid-proton-debuginfo Red Hat:a_mq_clients:2::el6 | All versions | 0:0.31.0-3.el6_10 |
qpid-proton-tests Red Hat:a_mq_clients:2::el6 | All versions | 0:0.31.0-3.el6_10 |
python-qpid-proton Red Hat:a_mq_clients:2::el7 | All versions | 0:0.31.0-3.el7 |
python-qpid-proton-docs Red Hat:a_mq_clients:2::el7 | All versions | 0:0.31.0-3.el7 |
qpid-cpp Red Hat:a_mq_clients:2::el7 | All versions | 0:1.36.0-30.el7amq |
qpid-cpp-client Red Hat:a_mq_clients:2::el7 | All versions | 0:1.36.0-30.el7amq |
qpid-cpp-client-devel Red Hat:a_mq_clients:2::el7 | All versions | 0:1.36.0-30.el7amq |
qpid-cpp-client-docs Red Hat:a_mq_clients:2::el7 | All versions | 0:1.36.0-30.el7amq |
qpid-cpp-debuginfo Red Hat:a_mq_clients:2::el7 | All versions | 0:1.36.0-30.el7amq |
qpid-proton Red Hat:a_mq_clients:2::el7 | All versions | 0:0.31.0-3.el7 |
qpid-proton-c Red Hat:a_mq_clients:2::el7 | All versions | 0:0.31.0-3.el7 |
qpid-proton-c-devel Red Hat:a_mq_clients:2::el7 | All versions | 0:0.31.0-3.el7 |
qpid-proton-c-docs Red Hat:a_mq_clients:2::el7 | All versions | 0:0.31.0-3.el7 |
qpid-proton-cpp Red Hat:a_mq_clients:2::el7 | All versions | 0:0.31.0-3.el7 |
qpid-proton-cpp-devel Red Hat:a_mq_clients:2::el7 | All versions | 0:0.31.0-3.el7 |
qpid-proton-cpp-docs Red Hat:a_mq_clients:2::el7 | All versions | 0:0.31.0-3.el7 |
qpid-proton-debuginfo Red Hat:a_mq_clients:2::el7 | All versions | 0:0.31.0-3.el7 |
qpid-proton-tests Red Hat:a_mq_clients:2::el7 | All versions | 0:0.31.0-3.el7 |
rubygem-qpid_proton Red Hat:a_mq_clients:2::el7 | All versions | 0:0.31.0-2.el7 |
rubygem-qpid_proton-debuginfo Red Hat:a_mq_clients:2::el7 | All versions | 0:0.31.0-2.el7 |
nodejs-rhea Red Hat:a_mq_clients:2::el8 | All versions | 0:1.0.21-1.el8 |
python-qpid-proton-docs Red Hat:a_mq_clients:2::el8 | All versions | 0:0.31.0-3.el8 |
python3-qpid-proton Red Hat:a_mq_clients:2::el8 | All versions | 0:0.31.0-3.el8 |
python3-qpid-proton-debuginfo Red Hat:a_mq_clients:2::el8 | All versions | 0:0.31.0-3.el8 |
Products include Debian Debian Linux, Fedoraproject Fedora, Netapp Oncommand Api Services, Netapp Oncommand Insight, Netapp Oncommand Workflow Automation, Netty Netty and 7 more.
How do I fix CVE-2020-11612?
Upgrade io.netty:netty-handler to 4.1.46 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-2020-11612 being exploited?
There is no known exploitation of CVE-2020-11612 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as CLEANSTART-2026-TF61372, CVE-2020-10707, DEBIAN-CVE-2020-11612, GHSA-mm9x-g8pc-w292, RHSA-2020:2605, UBUNTU-CVE-2020-11612.