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VBScript - MSXML Execution Policy Bypass Exploit
| Reporter | Title | Published | Views | Family All 43 |
|---|---|---|---|---|
 | CVE-2018-8619 | 12 Dec 201800:29 | – | attackerkb |
 | The vulnerability in Internet Explorer, caused by an operation that goes beyond the buffer boundaries in memory, allows a malicious actor to execute arbitrary code with the privileges of the current user. | 28 Dec 201800:00 | – | bdu_fstec |
 | CVE-2018-8619 | 20 Dec 201800:00 | – | circl |
 | Microsoft Internet Explorer VBScript Engine Remote Memory Corruption Vulnerability (CNVD-2019-39018) | 12 Dec 201800:00 | – | cnvd |
 | Microsoft Internet Explorer Remote Code Execution (CVE-2018-8619) | 11 Dec 201800:00 | – | checkpoint_advisories |
 | CVE-2018-8619 | 12 Dec 201800:00 | – | cve |
 | CVE-2018-8619 | 12 Dec 201800:00 | – | cvelist |
 | Internet Explorer help | 11 Dec 201808:00 | – | mskb |
| December 11, 2018—KB4471318 (Monthly Rollup) | 11 Dec 201808:00 | – | mskb |
| December 11, 2018—KB4471320 (Monthly Rollup) | 11 Dec 201808:00 | – | mskb |
10
According to https://blogs.windows.com/msedgedev/2017/07/07/update-disabling-vbscript-internet-explorer-11/, Starting from Windows 10 Fall Creators Update, VBScript execution in IE 11 should be disabled for websites in the Internet Zone and the Restricted Sites Zone by default.
However, the VBScript execution policy does not appear to cover VBScript code in MSXML xsl files which can still execute VBScript, even when loaded from the Internet Zone.
To demonstrate, place the files in the attached archive on a web server in the Internet zone and open index.html. If successful, the text "Hello from VBscript" will be rendered on the page. If you look at the provided code, this text is assembled dynamically by VBScript.
This has been tested on Windows 10 Version 1803 with the latest patches applied and VBScript execution policy applied for the Internet Zone (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3\140C = 3).
Proof of Concept:
https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/46023.zip
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22 Dec 2018 00:00Current
CVSS 37.5
CVSS 27.6
EPSS0.61268