CVE-2015-2877

NameCVE-2015-2877
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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitylow (attack range: local)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)wheezy3.2.78-1vulnerable
wheezy (security)3.2.96-3vulnerable
jessie3.16.51-2vulnerable
jessie (security)3.16.51-3+deb8u1vulnerable
stretch4.9.65-3vulnerable
stretch (security)4.9.65-3+deb9u2vulnerable
buster, sid4.14.13-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)(unfixed)unimportant
linux-2.6source(unstable)(unfixed)unimportant

Notes

https://www.usenix.org/conference/woot15/workshop-program/presentation/barresi
http://www.antoniobarresi.com/security/cloud/2015/07/30/cain/
Architectual limitation, workaround exists

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