SMTP: ANI Malformed Header

This signature detects a Windows Animated Cursor file containing an invalid header. Some versions of Microsoft Outlook are vulnerable. A successful attack can allow an attacker to run code at user level privilege. In order for this signature to work effectively, you may need to adjust the "maximum number of base-64 bytes to decode" k-const in your policy to a higher value than the default.

Extended Description

Microsoft Windows is prone to a stack buffer-overflow vulnerability because of insufficient format validation that occurs when handling malformed ANI cursor or icon files. An attacker can exploit this issue to execute arbitrary code with the privileges of an unsuspecting user. A successful attack can result in the compromise of affected user accounts and computers. This issue affects Windows Vista, Windows XP SP2, and Windows Server 2003 SP1 when running Internet Explorer 6 and 7; other versions and client applications may also be affected. Microsoft has recently disclosed that Outlook 2007 is not vulnerable, that Windows Mail on Vista is vulnerable in replying to or forwarding emails containing malicious ANI files, and that Outlook Express is vulnerable to this issue. Third-party applications such as browsers that handle ANI files and call the ANI rendering functionality in GDI pose an attack vector for this vulnerability.

Affected Products

Avaya messaging_application_server,Microsoft windows_server_2003_datacenter_x64_edition

References

CVE: CVE-2007-0038

URL: http://www.microsoft.com/technet/security/advisory/935423.mspx

Short Name

SMTP:MAL:ANI-MAL-HEADER

Severity

Minor

Recommended

False

Recommended Action

None

SMTP: ANI Malformed Header

Extended Description

Affected Products

References

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