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Microsoft Office Outlook Denial of Service Vulnerability

Information

Severity

Severity

Medium

Family

Family

Denial of Service

CVSSv2 Base

CVSSv2 Base

5.0

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Solution Type

Solution Type

Mitigation

Created

Created

5 years ago

Modified

Modified

3 years ago

Summary

This host is installed with Microsoft Office Outlook and is prone to denial of service vulnerability.

Insight

Insight

The flaw is due to the XML parser in Microsoft Office does not properly detect recursion during entity expansion.

Affected Software

Affected Software

Microsoft Outlook 2007 Microsoft Outlook 2010 Microsoft Outlook 2013.

Detection Method

Detection Method

Checks if a vulnerable version is present on the target host.

Solution

Solution

A workaround is to add a rule blocking XML DTD Entities ('<!ENTITY', case-insensitive) to your spam filter. Creating an Outlook rule to permanently delete messages containing '<!ENTITY' also mitigates the attack.

Common Vulnerabilities and Exposures (CVE)