NVD - CVE-2015-2877

CVE-2015-2877 Detail

Current Description

** DISPUTED ** Kernel Samepage Merging (KSM) in the Linux kernel 2.6.32 through 4.x does not prevent use of a write-timing side channel, which allows guest OS users to defeat the ASLR protection mechanism on other guest OS instances via a Cross-VM ASL INtrospection (CAIN) attack. NOTE: the vendor states "Basically if you care about this attack vector, disable deduplication." Share-until-written approaches for memory conservation among mutually untrusting tenants are inherently detectable for information disclosure, and can be classified as potentially misunderstood behaviors rather than vulnerabilities.

Source: MITRE
Description Last Modified: 03/03/2017
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 3.3 LOW
Vector: AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N (V3 legend)
Impact Score: 1.4
Exploitability Score: 1.8

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): None
Availability (A): None

CVSS v2.0 Severity and Metrics:

Base Score: 2.1 LOW
Vector: (AV:L/AC:L/Au:N/C:P/I:N/A:N) (V2 legend)
Impact Subscore: 2.9
Exploitability Subscore: 3.9

Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): Partial
Integrity (I): None
Availability (A): None
Additional Information:
Allows unauthorized disclosure of information

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
http://www.antoniobarresi.com/files/cain_advisory.txt	Technical Description Third Party Advisory
http://www.kb.cert.org/vuls/id/935424	Third Party Advisory US Government Resource
http://www.securityfocus.com/bid/76256	Third Party Advisory VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1252096	Issue Tracking
https://www.kb.cert.org/vuls/id/BGAR-A2CNKG	Third Party Advisory US Government Resource
https://www.kb.cert.org/vuls/id/BLUU-9ZAHZH	Third Party Advisory US Government Resource
https://www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdf	Technical Description Third Party Advisory

Technical Details

Vulnerability Type (View All)

Information Leak / Disclosure (CWE-200)

Vulnerable software and versions Switch to CPE 2.2

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Change History

1 change record found - show changes

Initial Analysis - 3/16/2017 11:19:41 AM

Action	Type	Old Value	New Value
Added	CPE Configuration		Record truncated, showing 500 of 60456 characters. View Entire Change Record OR cpe:2.3:o:linux:linux_kernel:2.6.32::::::: cpe:2.3:o:linux:linux_kernel:2.6.32:rc1::::::* cpe:2.3:o:linux:linux_kernel:2.6.32:rc3::::::* cpe:2.3:o:linux:linux_kernel:2.6.32:rc4::::::* cpe:2.3:o:linux:linux_kernel:2.6.32:rc5::::::* cpe:2.3:o:linux:linux_kernel:2.6.32:rc6::::::* cpe:2.3:o:linux:linux_kernel:2.6.32:rc7::::::* cpe:2.3:o:linux:linux_kernel:2.6.32:rc8::::::* *cpe:2.3:o:linux:linux_kernel:
Added	CVSS V2		(AV:L/AC:L/Au:N/C:P/I:N/A:N)
Added	CVSS V3		AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Added	CWE		CWE-200
Changed	Reference Type	http://www.antoniobarresi.com/files/cain_advisory.txt No Types Assigned	http://www.antoniobarresi.com/files/cain_advisory.txt Technical Description, Third Party Advisory
Changed	Reference Type	http://www.kb.cert.org/vuls/id/935424 No Types Assigned	http://www.kb.cert.org/vuls/id/935424 Third Party Advisory, US Government Resource
Changed	Reference Type	http://www.securityfocus.com/bid/76256 No Types Assigned	http://www.securityfocus.com/bid/76256 Third Party Advisory, VDB Entry
Changed	Reference Type	https://bugzilla.redhat.com/show_bug.cgi?id=1252096 No Types Assigned	https://bugzilla.redhat.com/show_bug.cgi?id=1252096 Issue Tracking
Changed	Reference Type	https://www.kb.cert.org/vuls/id/BGAR-A2CNKG No Types Assigned	https://www.kb.cert.org/vuls/id/BGAR-A2CNKG Third Party Advisory, US Government Resource
Changed	Reference Type	https://www.kb.cert.org/vuls/id/BLUU-9ZAHZH No Types Assigned	https://www.kb.cert.org/vuls/id/BLUU-9ZAHZH Third Party Advisory, US Government Resource
Changed	Reference Type	https://www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdf No Types Assigned	https://www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdf Technical Description, Third Party Advisory

Quick Info

CVE Dictionary Entry:
CVE-2015-2877
NVD Published Date:
03/03/2017
NVD Last Modified:
03/16/2017

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Information Technology Laboratory

National Vulnerability Database