leesh3288

Sandbox Escape in vm2@3.9.15

Summary

There exists a vulnerability in source code transformer (exception sanitization logic) of vm2 for versions up to 3.9.15, allowing attackers to bypass handleException() and leak unsanitized host exceptions which can be used to escape the sandbox and run arbitrary code in host context.

Proof of Concept

ignis-sec

<script>
/*
〱='',〳=〱,ᘓ=〱+{},ᘒ=〱+[][[]],〱+=[〱==〱],〳+=[!〱],ᘑ=+[],ᘐ=+!+[],ᘔ=ᘐ+ᘐ,ᘕ=ᘔ+ᘐ,ᘖ=ᘔ+ᘕ,ᘖ+=ᘖ+ᘖ+ᘔ,ᘗ=ᘖ+ᘐ,ᘘ=ᘓ[ᘔ+ᘕ],ᘙ=ᘓ[ᘐ],ᘚ=〱[ᘐ],ᘲ=〱[ᘑ],ᘳ=ᘘ+ᘙ+ᘒ[ᘐ]+〳[ᘕ]+ᘲ+ᘚ+ᘒ[ᘑ]+ᘘ+ᘲ+ᘙ+〱[ᘐ],ᘰ=[][ᘳ][ᘳ],ᘏ=''+ᘰ,ᘎ=〳[ᘐ]+〳[ᘔ]+〱[ᘕ]+ᘚ+ᘲ+ᘏ[ᘖ]+ᘏ[ᘗ],ᘰ`ᘳ${ᘎ}```     
*/


〱=''
〳=〱              //''
ᘓ=〱+{}           //'[object Object]' <- '' + [object Object]
ᘒ=〱+[][[]]       //'undefined'       <- '' + undefined 

spalladino

# Backup
docker exec CONTAINER /usr/bin/mysqldump -u root --password=root DATABASE > backup.sql

# Restore
cat backup.sql | docker exec -i CONTAINER /usr/bin/mysql -u root --password=root DATABASE