CVE-2015-2877
Published: March 3, 2017Last modified: April 24, 2024
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
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 3.3 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | LOW |
| Integrity impact | NONE |
| Availability impact | NONE |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | Stream | linux-lts | Vulnerable (6.1.33-r0) |
References
- 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