A denial of service flaw was found in the way the TLS/SSL protocol specifies processing of ALERT packets during a connection handshake. A remote attacker could use this flaw to make the ScreenOS TLS/SSL server consume an excessive amount of CPU time and trigger a denial of service condition for the ScreenOS device.

Affected releases are Juniper Networks ScreenOS 6.3.0 prior to 6.3.0r24.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue has been assigned CVE-2016-8610.

The following software releases have been updated to resolve this specific issue: 6.3.0r24 and all subsequent releases.

This issue is being tracked as PR 1228608 and is visible on the Customer Support website.

Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/screenos.html .

Use access lists or firewall filters to limit access to the firewall's WebUI only from trusted hosts

2017-10-11: Initial Publication.

• KB16613: Overview of the Juniper Networks SIRT Monthly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Vulnerability - How to Contact the Juniper Networks Security Incident Response Team
• CVE-2016-8610 at cve.mitre.org

Juniper SIRT would like to acknowledge and thank

• Shi Lei of Gear Team, Qihoo 360 Inc.