Vulnerability-Lookup

GHSA-4PM5-34CF-2V36

Vulnerability from github – Published: 2022-05-13 01:25 – Updated: 2022-05-13 01:25

Details

** 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.

Severity

3.3 (Low)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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{
  "affected": [],
  "aliases": [
    "CVE-2015-2877"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2017-03-03T11:59:00Z",
    "severity": "LOW"
  },
  "details": "** 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.",
  "id": "GHSA-4pm5-34cf-2v36",
  "modified": "2022-05-13T01:25:53Z",
  "published": "2022-05-13T01:25:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2015-2877"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1252096"
    },
    {
      "type": "WEB",
      "url": "https://www.kb.cert.org/vuls/id/BGAR-A2CNKG"
    },
    {
      "type": "WEB",
      "url": "https://www.kb.cert.org/vuls/id/BLUU-9ZAHZH"
    },
    {
      "type": "WEB",
      "url": "https://www.usenix.org/system/files/conference/woot15/woot15-paper-barresi.pdf"
    },
    {
      "type": "WEB",
      "url": "http://www.antoniobarresi.com/files/cain_advisory.txt"
    },
    {
      "type": "WEB",
      "url": "http://www.kb.cert.org/vuls/id/935424"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/76256"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2015-2877 (GCVE-0-2015-2877)

Vulnerability from cvelistv5 – Published: 2017-03-03 11:00 – Updated: 2024-08-06 05:32 Disputed

Summary

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

No CVSS data available.

CWE

Assigner

certcc mitre root

References

7 references

URL	Tags
http://www.securityfocus.com/bid/76256	vdb-entryx_refsource_BID
http://www.kb.cert.org/vuls/id/935424	third-party-advisoryx_refsource_CERT-VN
http://www.antoniobarresi.com/files/cain_advisory.txt	x_refsource_MISC
https://www.kb.cert.org/vuls/id/BGAR-A2CNKG	x_refsource_MISC
https://www.kb.cert.org/vuls/id/BLUU-9ZAHZH	x_refsource_MISC
https://bugzilla.redhat.com/show_bug.cgi?id=1252096	x_refsource_MISC
https://www.usenix.org/system/files/conference/wo…	x_refsource_MISC

Date Public

2015-07-30 00:00

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.