JVN#39157969 Third-party cookie issue in Opera

Overview

Opera contains an issue in which third-party cookies are not handled properly.

Products Affected

Opera 9.64 and earlier

Description

Opera contains an issue in which third-party cookies are not handled properly. Please note that this issue only occurs when the user changes the setting for "Accept only cookies from the site I visit" from the default installation of Opera.

Impact

A remote attacker may be able to trace an user's activity on the web.

Solution

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

Vendor Status

Vendor	Link
Opera	Opera 10

References

JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2009.09.17

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	Complex - the user must be convinced to take a difficult or suspicious action. If the honest user must have elevated privileges, they are likely to be more suspicious	Low
Exploit Complexity	Low - little to no expertise and/or luck required to exploit (cross-site scripting)	High

Description of each analysis measures

Credit

Hideki Sakamoto of Tsukuba Secure Network Research Co. Ltd. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Alert
JPCERT Reports
CERT Advisory
CPNI Advisory
TRnotes
CVE
JVN iPedia	JVNDB-2009-000061