Published:2011/09/02  Last Updated:2011/09/06

Sage vulnerable to arbitrary script execution


Sage is vulnerable to arbitrary script execution.

Note that this vulnerability is different from JVN#99203127.

Products Affected

  • Sage versions 1.3.10 and earlier


Sage is an addon for Mozilla Firefox that adds an RSS/Atom feed reader. Sage is vulnerable to arbitrary script execution due to the improper processing during HTML page output based on feed information.


An arbitrary script embedded in an RSS/Atom feed may be executed on the user's Mozilla Firefox.


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

Apply a workaround
Until an update can be applied, the workaround below may reduce the impact of this vulnerability:

  • Uncheck the option for "Read feed into contents area" in Sage

Vendor Status

Vendor Link
Sage Sage - download


JPCERT/CC Addendum

This JVN publication was delayed to 2011/09/02 after the developer fix was developed. From the fiscal year 2011, JPCERT/CC is using a new vendor coordination procedure. This new procedure came from the recommendation of the fiscal year 2010 "Study Group on Information System Vulnerability Handling" aimed at more timely JVN publications.

Vulnerability Analysis by JPCERT/CC

Analyzed on 2011.09.02

Measures Conditions Severity
Access Required can be attacked over the Internet using packets
  • High
Authentication anonymous or no authentication (IP addresses do not count)
  • High
User Interaction Required the vulnerability can be exploited without an honest user taking any action
  • High
Exploit Complexity 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 suspiciouse
  • High

Description of each analysis measures


Yosuke HASEGAWA of NetAgent Co.,Ltd. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
CVE CVE-2011-3384
JVN iPedia JVNDB-2011-000069

Update History

CVE was added under the section "Other Information."