Vulnerability identifier: #VU39198

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-4970

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Netty
Universal components / Libraries / Libraries used by multiple products

Vendor: Netty project

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

handler/ssl/OpenSslEngine.java in Netty 4.0.x before 4.0.37.Final and 4.1.x before 4.1.1.Final allows remote attackers to cause a denial of service (infinite loop). <a href="http://cwe.mitre.org/data/definitions/835.html">CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')</a>

Mitigation
Install update from vendor's website.

Vulnerable software versions

Netty: 4.0.0 - 4.1

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External links
http://netty.io/news/2016/06/07/4-0-37-Final.html
http://netty.io/news/2016/06/07/4-1-1-Final.html
http://rhn.redhat.com/errata/RHSA-2017-0179.html
http://rhn.redhat.com/errata/RHSA-2017-1097.html
http://www.securityfocus.com/bid/96540
http://bugzilla.redhat.com/show_bug.cgi?id=1343616
http://github.com/netty/netty/pull/5364
http://lists.apache.org/thread.html/afaa5860e3a6d327eb96c3d82cbd2f5996de815a16854ed1ad310144@%3Ccommits.cassandra.apache.org%3E
http://wiki.opendaylight.org/view/Security_Advisories

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.