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Sid 1-36562

Message

OS-WINDOWS Microsoft Windows cng.sys memory leak kernel ASLR bypass attempt

Summary

The kernel in Microsoft Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 does not properly validate an unspecified address, which allows local users to bypass the KASLR protection mechanism, and consequently discover the cng.sys base address, via a crafted application, aka "Windows Kernel Security Feature Bypass Vulnerability."

Impact

CVSS base score 1.9 CVSS impact score 2.9 CVSS exploitability score 3.4 confidentialityImpact PARTIAL integrityImpact NONE availabilityImpact NONE

CVE-2015-1674:

CVSS base score 1.9

CVSS impact score 2.9

CVSS exploitability score 3.4

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

Detailed information

CVE-2015-1674: The kernel in Microsoft Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 does not properly validate an unspecified address, which allows local users to bypass the KASLR protection mechanism, and consequently discover the cng.sys base address, via a crafted application, aka "Windows Kernel Security Feature Bypass Vulnerability."

Affected systems

  • microsoft windows_8 -
  • microsoft windows_8.1 -
  • microsoft windows_rt -
  • microsoft windowsrt8.1 -
  • microsoft windowsserver2012 -
  • microsoft windowsserver2012 r2

Ease of attack

CVE-2015-1674:

Access Vector LOCAL

Access Complexity MEDIUM

Authentication NONE

False positives

None known

False negatives

None known

Corrective action

Upgrade to the latest non-affected version of the software.

Apply the appropriate vendor supplied patches.

Contributors

  • Talos research team.
  • This document was generated from data supplied by the national vulnerability database, a product of the national institute of standards and technology.
  • For more information see nvd.

Additional References

  • osvdb.org/show/osvdb/119822
  • technet.microsoft.com/en-us/security/bulletin/ms15-052