Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Sat, 16 May 2015 11:45:27 +0300
From: Michael Tokarev <mjt@....msk.ru>
To: oss-security@...ts.openwall.com
CC: qemu-devel <qemu-devel@...gnu.org>
Subject: Re: QEMU 2.3.0 tmp vulns CVE request

[Adding Cc qemu-devel@]

13.05.2015 19:23, Kurt Seifried wrote:
> So some suspicious looking tmp usage in qemu (I excluded the test
> scripts and builds scripts, they were rife with problems so hopefully
> people only build in trusted environments).
> 
> Additionally there will no doubt be further QEMU issues found in the
> next few days/weeks as people start looking, I would ask that this be
> handled publicly unless it's Remote Code Exec or equivalent (e.g.
> CVE-2015-3456).
> 
> 
> 
> ====================================================================
> http://wiki.qemu-project.org/download/qemu-2.3.0.tar.bz2
> 
> ====================================================================
> ./roms/u-boot/tools/patman/series.py:
> ./roms/u-boot/lib/lzma/import_lzmasdk.sh

This is part of u-boot source maintained externally but included
in qemu sources tarball.  It is not used directly even for building
qemu, used only by relevant maintainers when they update files in
pc-bios/ which are produced from this set of sources.  If the bug
is to be assigned, it should be filed against u-boot not qemu.

> ====================================================================
> ./roms/ipxe/src/util/niclist.pl:

The same thing, it is ipxe source, not used by qemu in any way.

> ====================================================================
> 
> ./net/slirp.c:
>     snprintf(s->smb_dir, sizeof(s->smb_dir), "/tmp/qemu-smb.%ld-%d",
>              (long)getpid(), instance++);

This one is real, used for -smb argument, to start smbd, making
its configuration.  Maybe tmpnam() should be used here.

> ====================================================================
> ./tcg/tcg.c:
> #ifdef DEBUG_JIT
>     /* Enable this block to be able to debug the ELF image file creation.
>        One can use readelf, objdump, or other inspection utilities.  */
>     {
>         FILE *f = fopen("/tmp/qemu.jit", "w+b");
>         if (f) {
>             if (fwrite(img, img_size, 1, f) != img_size) {
>                 /* Avoid stupid unused return value warning for fwrite.  */
>             }
>             fclose(f);
>         }
>     }
> #endif

This is solely for debugging by JIT maintainers.  Not useful for or
used by users.


>From all the above, only net/slirp.c issue might be of interest.

Thanks,

/mjt

Powered by blists - more mailing lists

Your e-mail address:

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.