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Date: Wed, 3 Aug 2011 17:00:17 -0400 (EDT)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: coley <coley@...re.org>
Subject: Re: CVE id request: shttpd/mongoose/yassl embedded
 webserver

Please use CVE-2011-2900.

Thanks.

-- 
    JB


----- Original Message -----
> Hi,
> I found a buffer overflow in the PUT processing of
> shttpd/mongoose/yassl
> embedded webserver (all based on the same source code).
> 
> Can someone assign a CVE id to this?
> Upstream fix:
> https://code.google.com/p/mongoose/source/detail?r=556f4de91eae4bac40dc5d4ddbd9ec7c424711d0#
> 
> The bug:
> _shttpd_put_dir()/put_dir() function:
> 26 for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
> 27 len = p - path;
> 28 assert(len < sizeof(buf));
> 29 (void) memcpy(buf, path, len);
> 30 buf[len] = '\0';
> 31
> 32 /* Try to create intermediate directory */
> 33 if (_shttpd_stat(buf, &st) == -1 &&
> 34 _shttpd_mkdir(buf, 0755) != 0)
> 35 return (-1);
> 36
> 37 /* Is path itself a directory ? */
> 38 if (p[1] == '\0')
> 39 return (0);
> 40 }
> 
> The only guard here to avoid a buffer overflow with a long path is
> the assert call in line 28. Unfortunately this is disabled if
> you compile with -DNDEBUG and from what I see quite a lot of people
> are doing that in order to reduce the binary size (those are embedded
> webservers intended to be used in embedded environments).
> 
> It seems quite some projects actually do that, including a
> deployed product embedded product I'm currently
> looking at (and that was rooted because of this bug).
> From what I see -DNDEBUG in the mongoose makefile this is also the
> default for the mingw
> binary.
> 
> If this is not the case, this is still a DoS bug.
> 
> Kind regards
> Nico
> --
> Nico Golde - http://www.ngolde.de - nion@...ber.ccc.de - GPG:
> 0xA0A0AAAA
> For security reasons, all text in this mail is double-rot13 encrypted.

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