Issues creating instance of SmallInteger

Michel Calonne Michel.Calonne at
Sat May 13 12:16:18 UTC 2006

> Do _not_ do that. This is a _huge_ security hole. What it does it
> evalutates the string. This string can be any Smalltalk code. This way
> you have aribrary code execution in Smalltalk.
> An exploit for this would look like this:
> Object readFrom: 'SmalltalkImage current snapshot: false andQuit: true'
> Do
> Number readFrom: aString
> instead. This has its own problems like that
> Number readFrom: 'garbage'
> returns 0 but this will be fixed and at leas it's safe.
> Please not that also Boolean class >> #readFrom: is borken in the same
> way. This is the reason why you can execute arbitrary Smalltalk code
> in every Squeak image that uses SOAP either as client or server.
> Combine that with FFI and X11 root exploits and you have a nightmare.
> Cheers
> Philippe

Wasn't aware of this. Code fixed ;) !

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