Vulnerability-Lookup

SUSE-SU-2021:3181-1

Vulnerability from csaf_suse - Published: 2021-09-21 14:31 - Updated: 2021-09-21 14:31

Summary

Security update for xen

Severity

Moderate

Notes

Title of the patch: Security update for xen

Description of the patch: This update for xen fixes the following issues: - CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632). - Upstream bug fixes (bsc#1027519)

Patchnames: SUSE-2021-3181,SUSE-SLE-SDK-12-SP5-2021-3181,SUSE-SLE-SERVER-12-SP5-2021-3181

CVE-2021-28701

7.4 (High)


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

Affected products

Recommended 14 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:xen-4.12.4_14-3.52.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:xen-doc-html-4.12.4_14-3.52.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:xen-libs-32bit-4.12.4_14-3.52.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:xen-libs-4.12.4_14-3.52.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:xen-tools-4.12.4_14-3.52.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:xen-tools-domU-4.12.4_14-3.52.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-4.12.4_14-3.52.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-doc-html-4.12.4_14-3.52.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-libs-32bit-4.12.4_14-3.52.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-libs-4.12.4_14-3.52.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-tools-4.12.4_14-3.52.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-tools-domU-4.12.4_14-3.52.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Software Development Kit 12 SP5:xen-devel-4.12.4_14-3.52.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Software Development Kit 12 SP5:xen-devel-4.12.4_14-3.52.1.x86_64	—	Vendor Fix

Threats

Impact important

References

9 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-security-upd…	self
https://bugzilla.suse.com/1027519	self
https://bugzilla.suse.com/1189632	self
https://www.suse.com/security/cve/CVE-2021-28701/	self
https://www.suse.com/security/cve/CVE-2021-28701	external
https://bugzilla.suse.com/1189632	external

JSON

To clipboard

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  "vulnerabilities": [
    {
      "cve": "CVE-2021-28701",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2021-28701"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.",
          "title": "CVE description"
        }
      ],
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          "category": "external",
          "summary": "CVE-2021-28701",
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        },
        {
          "category": "external",
          "summary": "SUSE Bug 1189632 for CVE-2021-28701",
          "url": "https://bugzilla.suse.com/1189632"
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      ],
      "remediations": [
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      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2021-09-21T14:31:40Z",
          "details": "important"
        }
      ],
      "title": "CVE-2021-28701"
    }
  ]
}

CVE-2021-28701 (GCVE-0-2021-28701)

Vulnerability from cvelistv5 – Published: 2021-09-08 13:02 – Updated: 2024-08-03 21:47

Summary

Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.

Severity

No CVSS data available.

CWE

unknown

Assigner

XEN mitre root

References

8 references

URL	Tags
https://xenbits.xenproject.org/xsa/advisory-384.txt	x_refsource_MISC
http://xenbits.xen.org/xsa/advisory-384.html	x_refsource_CONFIRM
http://www.openwall.com/lists/oss-security/2021/09/08/2	mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://www.debian.org/security/2021/dsa-4977	vendor-advisoryx_refsource_DEBIAN
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://security.gentoo.org/glsa/202208-23	vendor-advisoryx_refsource_GENTOO

Impacted products

3 products

Vendor	Product	Version
Xen	xen	Unknown: unspecified , < 4.12 (custom) Affected: 4.15.x , < unspecified (custom) Unaffected: next of xen-unstable , < unspecified (custom)
Xen	xen	Affected: 4.11.x
Xen	xen	Unknown: unspecified , < 4.12 (custom) Affected: 4.12.x , < unspecified (custom) Unaffected: next of 4.14.x , < unspecified (custom)

Credits

{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Julien Grall of Amazon.'}]}}}

Show details on NVD website

JSON

To clipboard

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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.