CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
EPSS
Percentile
84.3%
Apple Safari automatically executes downloaded files based on Internet Explorer zone settings, which can allow a remote attacker to execute arbitrary code on a vulnerable system.
Apple Safari is a web browser that is available for OS X and Microsoft Windows platforms. Apple Safari for Microsoft Windows will modify its behavior based on the Internet Explorer security zone settings. One of the Internet Explorer zone settings that Safari queries is URLACTION_SHELL_EXECUTE_HIGHRISK
, which is stored as registry value 1806
in the Internet Explorer URL Security Zone section of the Windows registry. If this value is set to βallowedβ for the associated URL Security Zone, Safari will automatically execute files, which are also automatically downloaded from the website.
For the Trusted Sites and Local Intranet zones on Internet Explorer 6 systems, this value defaults to 0x00
, which indicates that the action is βallowed.β This URL Security Zone setting appears to have no representation in the GUI for configuring the zones on Internet Explorer 6 systems. This means that no matter how the Trusted Sites or Local Intranet zones are configured using the graphical interface for Internet Explorer, Safari will automatically execute files that are downloaded from sites that reside in these zones.
Internet Explorer 7 systems expose the URLACTION_SHELL_EXECUTE_HIGHRISK
URL Security Zone setting as βLaunching applications and unsafe filesβ in the Internet Explorer zone security configuration dialog. This value defaults to 0x01
for the Trusted Sites zone, and 0x00
for the Local Intranet zone, which correlate to βpromptβ and βallow,β respectively. This means that by default, any site in the Local Intranet zone on Internet Explorer 7 systems can cause Safari to automatically execute downloaded files. Safari will automatically execute downloaded files in other zones if the βLaunching applications and unsafe filesβ option is set to βallow.β
By convincing a user to visit a specially crafted web page with Apple Safari on Windows, an attacker may be able to execute arbitrary code on a vulnerable system.
Apply an update
This issue is addressed in Safari for Windows 3.1.2. Please see the Apple Security Update for more details. This version of Safari will prompt the user before downloading or executing files.
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Notified: June 09, 2008 Updated: June 19, 2008
Affected
We have not received a statement from the vendor.
The vendor has not provided us with any further information regarding this vulnerability.
This issue is addressed in Safari for Windows 3.1.2. Please see the Apple Security Update for more details. This version of Safari will prompt the user before downloading or executing files.
If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23127185 Feedback>).
Group | Score | Vector |
---|---|---|
Base | ||
Temporal | ||
Environmental |
This vulnerability was reported by Will Dormann of the CERT/CC.
This document was written by Will Dormann.
CVE IDs: | CVE-2008-2306 |
---|---|
Severity Metric: | 8.10 Date Public: |