CVE-2016-7385 : Detail

CVE-2016-7385

7.8
/
High
A01-Broken Access Control
0.14%V3
Local
2016-11-08
19h37 +00:00
2017-09-02
07h57 +00:00
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CVE Descriptions

For the NVIDIA Quadro, NVS, and GeForce products, NVIDIA Windows GPU Display Driver R340 before 342.00 and R375 before 375.63 contains a vulnerability in the kernel mode layer (nvlddmkm.sys) handler for DxgDdiEscape ID 0x700010d where a value passed from a user to the driver is used without validation as the index to an internal array, leading to denial of service or potential escalation of privileges.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-264 Category : Permissions, Privileges, and Access Controls
Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 7.8 HIGH CVSS:3.0/AV:L/AC:L/PR:L/UI:N/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.

Local

A vulnerability exploitable with Local access means that the vulnerable component is not bound to the network stack, and the attacker's path is via read/write/execute capabilities. In some cases, the attacker may be logged in locally in order to exploit the vulnerability, otherwise, she may rely on User Interaction to execute a malicious file.

Attack Complexity

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

Low

Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.

Privileges Required

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

Low

The attacker is authorized with (i.e. requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.

User Interaction

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

None

The vulnerable system can be exploited without interaction from any user.

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 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C [email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

Exploit information

Exploit Database EDB-ID : 40657

Publication date : 2016-10-30 23h00 +00:00
Author : Google Security Research
EDB Verified : Yes

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=894 The DxgkDdiEscape handler for 0x700010d accepts a user provided pointer as the destination for a memcpy call, without doing any checks on said pointer. void __fastcall escape_700010D(NvMiniportDeviceContext* ctx, NvEscapeData *escape) { ... v8 = escape->unknown_2; if ( v8 == 1 ) { data.size = escape->size; data.buf = ExAllocatePoolWithTag((POOL_TYPE)512, 0xC08i64 * data.size, 0x7061564Eu); v9 = Escape7Handler(0i64, dword_7DCB84, dword_7DCB84, 626, &data, 0x190); } ... else if ( escape->unknown_2 == 1 ) { memcpy(escape->user_ptr, data.buf, 3080i64 * escape->size); (Win 10 x64 372.54) crashing context with PoC (in memcpy) on a write to 0x4141414141414141: SYSTEM_SERVICE_EXCEPTION (3b) ... CONTEXT: ffffd0002d2ab5c0 -- (.cxr 0xffffd0002d2ab5c0) rax=0000000000000001 rbx=ffffc0016c9b9b40 rcx=000000000000000f rdx=bebe9ebf4b4e0ecf rsi=0000000000000001 rdi=000000007061564e rip=fffff8005488ab00 rsp=ffffd0002d2abfe8 rbp=ffffd0002d2ac0f0 r8=0000000000000bf9 r9=ffffd00024014ac0 r10=0000000000000000 r11=4141414141414141 r12=0000000000000340 r13=fffff800542b0000 r14=ffffe0008fb2d000 r15=0000000000000001 iopl=0 nv up ei pl nz ac po nc cs=0010 ss=0018 ds=002b es=002b fs=0053 gs=002b efl=00010216 nvlddmkm+0x5dab00: fffff800`5488ab00 f3410f7f03 movdqu xmmword ptr [r11],xmm0 ds:002b:41414141`41414141=???????????????????????????????? To reproduce, compile the PoC as a x64 binary (requires linking with setupapi.lib, and WDK for D3DKMTEscape), and run. It may require some changes as for it to work as the escape data must contain the right values (e.g. a field that appears to be gpu bus device function). My PoC should hopefully set all the right values for the machine it's running on. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/40657.zip

Products Mentioned

Configuraton 0

Nvidia>>Gpu_driver >> Version From (including) 340 To (excluding) 342.00

Nvidia>>Gpu_driver >> Version From (including) 375 To (excluding) 375.63

Microsoft>>Windows >> Version *

References

https://www.exploit-db.com/exploits/40657/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.securityfocus.com/bid/93981
Tags : vdb-entry, x_refsource_BID