NGSSoftware Insight Security Research Advisory Name: Norton AntiSpam Remote Buffer Overrun Systems Affected: Windows XP (not confirmed on 2000) Severity: High Vendor URL: http://www.symantec.com Author: Mark Litchfield [ mark@private ] Date Vendor Notified: 4th March 2004 Date of Public Advisory: 19th March 2004 Advisory number: #NISR19042004a Advisory URL: http://www.ngssoftware.com/advisories/antispam.txt Description *********** Symantec's Norton AntiSpamT 2004 filters unwanted email out of your inbox. Working with any POP3 email program, it filters incoming mail on multiple levels, detecting and flagging unsolicited messages while promptly delivering valid mail. To make your online time more enjoyable, Norton AntiSpam also blocks intrusive pop-up and banner ads. It is worth mentioning here, that Norton AntiSpamT is also packaged within Norton Internet Security 2004 and Norton Internet Security 2004 Professional. Details ******* Installed with Norton AntiSpam is an ActiveX component that is marked safe for scripting, namely SymSpamHelper Class (c:\program files\common files\symantec shared\antispam\symspam.dll). Using the method LaunchCustomRuleWizard with an overly long parameter, an attacker can cause a stack based overflow allowing the ability to remotley run arbitrary code on the target. This can be achieved either by encouraging the 'victim' to visit a malicious web page or placing a script within the content of an (html) email. Fix Information *************** Shipped with all Symantecs products is the LiveUpdate feature. Open Norton AntiSpam or Norton Internet Security / Professional and select the LiveUpdate feature which will retrieve the lastest patch. Also worth mentioning is Symantec's quick response to this issue in ensuring their clients remain protected. About NGSSoftware ***************** NGSSoftware design, research and develop intelligent, advanced application security assessment scanners. Based in the United Kingdom, NGSSoftware have offices in the South of London and the East Coast of Scotland. NGSSoftware's sister company NGSConsulting, offers best of breed security consulting services, specialising in application, host and network security assessments. http://www.ngssoftware.com/ Telephone +44 208 401 0070 Fax +44 208 401 0076 enquiries@private
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