CVE-2015-2877

LOW

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.

References

http://www.antoniobarresi.com/files/cain_advisory.txt

http://www.kb.cert.org/vuls/id/935424

http://www.securityfocus.com/bid/76256

https://bugzilla.redhat.com/show_bug.cgi?id=1252096

https://www.kb.cert.org/vuls/id/BGAR-A2CNKG

https://www.kb.cert.org/vuls/id/BLUU-9ZAHZH

https://www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdf

Details

Source: MITRE

Published: 2017-03-03

Updated: 2017-03-16

Type: CWE-200

Risk Information

CVSS v2.0

Base Score: 2.1

Vector: AV:L/AC:L/Au:N/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 3.9

Severity: LOW

CVSS v3.0

Base Score: 3.3

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Impact Score: 1.4

Exploitability Score: 1.8

Severity: LOW