CVE-2015-2877: Infoleak
First published: Mon Aug 10 2015(Updated: )
** 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.
Credit: cret@cert.org cret@cert.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=2.6.32<=4.20.15 | |
| Redhat Enterprise Linux | =4.0 | |
| Redhat Enterprise Linux | =5.0 | |
| Redhat Enterprise Linux | =6.0 | |
| Redhat Enterprise Linux | =7.0 | |
| >=2.6.32<=4.20.15 | ||
| =4.0 | ||
| =5.0 | ||
| =6.0 | ||
| =7.0 |
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Reference Links
- 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
- https://www.usenix.org/conference/woot15/workshop-program/presentation/barresi
- https://access.redhat.com/security/cve/CVE-2015-2877
- http://www.antoniobarresi.com/security/cloud/2015/07/30/cain/
- https://access.redhat.com/security/updates/classification/
- collector/nvd-index
- agent/type
- agent/first-publish-date
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2015-2877
- agent/author
- agent/weakness
- agent/references
- agent/severity
- agent/status
- agent/softwarecombine
- agent/description
- agent/tags
- agent/event
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- agent/last-modified-date
- collector/mitre-cve
- source/MITRE
- status/disputed
- vendor/linux
- canonical/linux linux kernel
- version/linux linux kernel/2.6.32
- version/linux linux kernel/4.20.15
- vendor/redhat
- canonical/redhat enterprise linux
- version/redhat enterprise linux/4.0
- version/redhat enterprise linux/5.0
- version/redhat enterprise linux/6.0
- version/redhat enterprise linux/7.0