[ISN] MS releases grand daughter of all IE security patches

From: InfoSec News (isnat_private)
Date: Fri May 17 2002 - 02:49:44 PDT

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    By John Leyden
    Posted: 16/05/2002 at 14:50 GMT
    Microsoft released another cumulative patch for Internet Explorer 
    yesterday, which promises to plug up six recently discovered security 
    defects involving the browser. 
    The patch, for IE 5.01, 5.5 and 6.0, includes the functionality of 
    previously released fixes, as well as tackling the new problems - the 
    most serious of which could allow an attacker to run code of his 
    choice on a victim's machine. Microsoft describes the patch as 
    'critical', so let's hope it works properly. 
    Six of the worst 
    The most serious bug involves a cross-site scripting vulnerability. IE 
    ships with several files that contain HTML on the local file system, 
    one of which contains a flaw that could allow a script to execute as 
    if it were run by the user. This bug could be exploited by an attacker 
    who tricks victims into either visiting a maliciously constructed Web 
    page or opening HTML email containing a poisoned script. 
    Next up us is an information disclosure vulnerability related to a 
    buggy HTML object, which is designed to provide support for Cascading 
    Style Sheets. Because of the bug, an attacker might be able to read, 
    but not delete or change, data on a local system, MS says. 
    Moving on, there's an information disclosure vulnerability involving 
    to the handling of script within cookies, which could potentially 
    allow one site to read the cookies of another. 
    Then there's a zone spoofing vulnerability that could allow a Web page 
    to be incorrectly reckoned to be in the Intranet zone or, in some very 
    rare cases, in the Trusted Sites zone. 
    Finally there are two variants of a 'content disposition' 
    vulnerability, which relate to how IE handles downloads when a 
    downloadable file's Content-Disposition and Content-Type headers are 
    intentionally malformed. Virus writers might use the technique to 
    disguise the fact that an attachment contains executable content, 
    hence the need for the patch. 
    As well as plugging up the six vulnerabilities listed above, 
    Microsoft's patch also disables frames in the Restricted Sites zone. 
    The change means that recently released MS email clients (and those 
    with Outlook Email Security Update installed) will disable frames in 
    HTML email by default, blocking the possibility of an HTML email 
    automatically opening a new window or launching the download of an 
    executable. At least that's the idea. 
    You could read about the problems in more details, and get links to 
    the relevant patch, in Microsoft's advisory on the subject. 
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