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CVE-2015-2877

3.3 · LOW

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 othe…

Published Mar 3, 2017CWE-200EPSS 0.94%

Overview

CVE-2015-2877 is a low-severity vulnerability. It was published on March 3, 2017 and has a CVSS 3.1 base score of 3.3 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.3, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.antoniobarresi.com/files/cain_advisory.txtRefwww.kb.cert.org/vuls/id/935424Refwww.securityfocus.com/bid/76256Refbugzilla.redhat.com/show_bug.cgi?id=1252096Refwww.kb.cert.org/vuls/id/BGAR-A2CNKGRefwww.kb.cert.org/vuls/id/BLUU-9ZAHZHRefwww.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdfRefwww.antoniobarresi.com/files/cain_advisory.txtRefwww.kb.cert.org/vuls/id/935424Refwww.securityfocus.com/bid/76256

How CyberStrike helps

Frequently asked questions

What is CVE-2015-2877?

CVE-2015-2877 is a low-severity vulnerability. It was published on March 3, 2017 and has a CVSS 3.1 base score of 3.3 (LOW).

How severe is CVE-2015-2877?

This vulnerability has a CVSS 3.1 base score of 3.3, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2015-2877?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2015-2877?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2015-2877 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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