CVE-2015-1721 : Detail

CVE-2015-1721

Memory Corruption
12.75%V3
Local
2015-06-09
23h00 +00:00
2018-10-12
17h57 +00:00
CVE.org
NVD
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CVE Descriptions

The kernel-mode drivers in Microsoft Windows Server 2003 SP2 and R2 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 allow local users to gain privileges or cause a denial of service (NULL pointer dereference and system crash) via a crafted application, aka "Win32k Null Pointer Dereference Vulnerability."

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-476 NULL Pointer Dereference
The product dereferences a pointer that it expects to be valid but is NULL.

Metrics

Metrics Score Severity CVSS Vector Source
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.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 38274

Publication date : 2015-09-21 22h00 +00:00
Author : Nils Sommer
EDB Verified : Yes

Source: https://code.google.com/p/google-security-research/issues/detail?id=294 Platform: Win7 32-bit. trigger.cpp should fire the issue, with a caveat - PoC might NOT work if compiled as a debug build. windbg.txt is a sample crash log. Analysis from Nils: --- please find attached a C trigger, windbg output and the minimised testcase of a null pointer issue (exploitable on Win 7 32-bit). The trigger also demonstrates that the null page can be mapped in user mode and accessed from kernel mode. Quick analysis: The trigger creates a new window station which is freed during the process clean up. Through the clipboard operations the window's last reference is hold by the clipboard which is freed during the clean up of the window station object. This will also result in destroying the window object at a time where _gptiCurrent (threadinfo) is already set to null. This is used in xxxDestroyWindow in multiple locations. Depending on the window type it is potentially possible to trigger different kinds of crashes, this one demonstrates a write to a chosen memory location: win32k!HMChangeOwnerThread+0x40: 96979765 ff412c inc dword ptr [ecx+2Ch] ds:0023:bebebeea=???????? --- Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/38274.zip

Products Mentioned

Configuraton 0

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_8 >> Version -

Microsoft>>Windows_8.1 >> Version -

Microsoft>>Windows_rt >> Version -

Microsoft>>Windows_rt_8.1 >> Version -

Microsoft>>Windows_server_2003 >> Version -

Microsoft>>Windows_server_2003 >> Version r2

Microsoft>>Windows_server_2008 >> Version -

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_server_2012 >> Version -

Microsoft>>Windows_server_2012 >> Version r2

Microsoft>>Windows_vista >> Version -

References

http://www.securitytracker.com/id/1032525
Tags : vdb-entry, x_refsource_SECTRACK
https://www.exploit-db.com/exploits/38274/
Tags : exploit, x_refsource_EXPLOIT-DB