CVE-2015-2877

 

Published at: - 03-03-2017 12:59

Last modified: - 26-10-2022 01:44

Total changes: - 4

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

 

Verification logic

 

Reference

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

 

Keywords

NVD

 

CVE-2015-2877

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures