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
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | >=2.6.32<=4.20.15 | |
| Red Hat Enterprise Linux | =4.0 | |
| Red Hat Enterprise Linux | =5.0 | |
| Red Hat Enterprise Linux | =6.0 | |
| Red Hat Enterprise Linux | =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/
Frequently Asked Questions
What is the severity of CVE-2015-2877?
The severity of CVE-2015-2877 is considered medium due to its potential impact on ASLR protection in virtualized environments.
How do I fix CVE-2015-2877?
To address CVE-2015-2877, it is recommended to apply the latest patches or updates to the Linux kernel that mitigate the vulnerability.
What is the impact of CVE-2015-2877?
CVE-2015-2877 allows a guest operating system to exploit a timing side channel to bypass Address Space Layout Randomization (ASLR) protections on other guest OS instances.
Which versions of Linux kernel are affected by CVE-2015-2877?
CVE-2015-2877 affects Linux kernel versions from 2.6.32 through 4.x up to 4.20.15.
Is Red Hat Enterprise Linux vulnerable to CVE-2015-2877?
Yes, Red Hat Enterprise Linux versions 4.0, 5.0, 6.0, and 7.0 are vulnerable to CVE-2015-2877.
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