oss-security - Re: Re: Possible CVE Request: Multiple stack overflows in squashfs-tools and sasquatch

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Date: Thu, 18 Jun 2015 12:41:18 -0400
From: Giancarlo Canales <gcanalesb@...com>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Cc: "cve-assign@...re.org" <cve-assign@...re.org>
Subject: Re: Re: Possible CVE Request: Multiple stack overflows
 in squashfs-tools and sasquatch

Yes, that is correct. 

Thanks.

> On Jun 18, 2015, at 12:20 PM, cve-assign@...re.org wrote:
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
>> Sasquatch is an experimental fork of squashfs-tools.
>> I'm requesting a CVE number for this vulnerability, per project.
> 
> CVE assignments typically cannot be done that way.
> 
>> https://github.com/devttys0/sasquatch/pull/5
> 
> As far as we can tell, there are two independent types of problems:
> 
>  - "int bytes" is incorrect because the return value of
>    SQUASHFS_FRAGMENT_BYTES can be larger than the maximum
>    value of a signed int
> 
>  - pull/5 says "If we fix this by making the variable size_t, we run
>    into an unrelated problem in which the stack VLA allocation of
>    fragment_table_index[] can easily exceed RLIMIT_STACK" but
>    actually RLIMIT_STACK can be exceeded regardless of the data type
>    of the bytes variable
> 
> We understand that the pull request is only intended to be an example
> code change, not a comprehensive code change to all affected
> functions.
> 
> This type of fork situation can have up to six CVEs:
> 
> 1 - all "int where size_t is correct" issues that occur only in squashfs-tools
> 
> 2 - all "int where size_t is correct" issues that occur only in sasquatch
> 
> 3 - all "int where size_t is correct" issues that occur in both squashfs-tools and sasquatch
> 
> 4 - all "exceeding RLIMIT_STACK" issues that occur only in squashfs-tools
> 
> 5 - all "exceeding RLIMIT_STACK" issues that occur only in sasquatch
> 
> 6 - all "exceeding RLIMIT_STACK" issues that occur in both squashfs-tools and sasquatch
> 
> We would guess that the most likely case is that only 3 and 6 are
> applicable, i.e., the code problems are found only in
> unsquash-1.c/unsquash-2.c/unsquash-3.c/unsquash-4.c and all of these
> files exist in both squashfs-tools and sasquatch. Is this correct?
> 
> - -- 
> CVE assignment team, MITRE CVE Numbering Authority
> M/S M300
> 202 Burlington Road, Bedford, MA 01730 USA
> [ PGP key available through http://cve.mitre.org/cve/request_id.html ]
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