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AUSCERT External Security Bulletin Redistribution
ESB-2015.1963
XSS vulnerability in FortiGate DHCP monitor WebUI page
28 July 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: FortiOS
Publisher: FortiGuard
Operating System: Network Appliance
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2015-3626
Original Bulletin:
http://www.fortiguard.com/advisory/FG-IR-15-018/
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XSS vulnerability in FortiGate DHCP monitor WebUI page
Risk 3 Medium
Date Jul 24 2015
Impact Cross-Site Scripting (persistent)
CVE ID CVE-2015-3626
Fixed In Firmware 5.2.4
The Web User Interface of FortiOS 5.2.3 and below is vulnerable to a
persistent cross-site scripting vulnerability in the DHCP monitor page.
Impact
Hostnames of DHCP clients are reflected in the DHCP Monitor page without
proper sanitization. Therefore a specifically crafted hostname provided by a
malicious DHCP client could yield code execution in the security context of
logged in users' browsers, as they view the DHCP Monitor page. The situation
will persist until the malicious DHCP client lease expires.
Affected Products
FortiOS 5.2.3 and lower.
Solutions
Upgrade to FortiOS 5.2.4.
As a workaround the DHCP server can be disabled at the interface level: System
> Network > Interfaces > Edit "interface name" > Untick the "DHCP server"
checkbox.
Acknowledgement
Thanks to Ziv Kamir.
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