JVN#67060882 sISAPILocation vulnerability bypasses HTTP header rewrite function

Overview

sISAPILocation, an ISAPI (Internet Server Application Program Interface) filter, contains a vulnerability that allows the HTTP header rewrite function to be bypassed.

Products Affected

sISAPILocation Ver1.0.2.1 and earlier

Description

sISAPILocation, developed by an individual developer, is an ISAPI filter for IIS (Internet Information Services). sISAPILocation contains a vulnerability that allows the HTTP header rewrite function to be bypassed.

Impact

When sISAPILocation is used to configure settings, such as to specify character encoding or to set the secure flag for cookies, such settings could be bypassed.

Solution

Update the Software
Update to the latest version according to the information provided by the developer.

Workarounds
Do not use the Keep-Alive feature on IIS until update is completed.

Vendor Status

Vendor	Link
Tomoki Sanaki	sISAPILocation (in Japanese)

References

JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2008.11.06

Measures	Conditions	Severity
Access Required	Routed - can be attacked over the Internet using packets	High
Authentication	None - anonymous or no authentication (IP addresses do not count)	High
User Interaction Required	None - the vulnerability can be exploited without an honest user taking any action	High
Exploit Complexity	Low-Medium - some expertise and/or luck required (most buffer overflows, guessing correctly in small space, expertise in Windows function calls)	Medium-High

Description of each analysis measures

Credit

Other Information

JPCERT Alert
JPCERT Reports
CERT Advisory
CPNI Advisory
TRnotes
CVE
JVN iPedia	JVNDB-2008-000076