Vulnerability-Lookup

RHSA-2021:5006

Vulnerability from csaf_redhat - Published: 2021-12-08 07:43 - Updated: 2025-11-21 18:27

Summary

Red Hat Security Advisory: Red Hat Virtualization Host security and bug fix update [ovirt-4.4.9] Async #1

Severity

Critical

Notes

Topic: An update for redhat-release-virtualization-host and redhat-virtualization-host is now available for Red Hat Virtualization 4 for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: The redhat-virtualization-host packages provide the Red Hat Virtualization Host. These packages include redhat-release-virtualization-host, ovirt-node, and rhev-hypervisor. Red Hat Virtualization Hosts (RHVH) are installed using a special build of Red Hat Enterprise Linux with only the packages required to host virtual machines. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks. Security Fix(es): * nss: Memory corruption in decodeECorDsaSignature with DSA signatures (and RSA-PSS) (CVE-2021-43527) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2021-43527

A remote code execution flaw was found in the way NSS verifies certificates. This flaw allows an attacker posing as an SSL/TLS server to trigger this issue in a client application compiled with NSS when it tries to initiate an SSL/TLS connection. Similarly, a server application compiled with NSS, which processes client certificates, can receive a malicious certificate via a client, triggering the flaw. The highest threat to this vulnerability is confidentiality, integrity, as well as system availability.

9.8 (Critical)


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

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Affected products

Fixed 2 products

Product	Identifier	Version	Remediation
Unresolved product id: 8Base-RHV-Hypervisor-4:redhat-virtualization-host-0:4.4.9-202112061811_8.5.src		—	Vendor Fix fix Workaround
Unresolved product id: 8Base-RHV-Hypervisor-4:redhat-virtualization-host-image-update-0:4.4.9-202112061811_8.5.x86_64		—	Vendor Fix fix Workaround

Known not affected 4 products

Product	Version	Remediation
Unresolved product id: 8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-3.el8ev.src	—	Workaround
Unresolved product id: 8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-3.el8ev.x86_64	—	Workaround
Unresolved product id: 8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-content-0:4.4.9-3.el8ev.x86_64	—	Workaround
Unresolved product id: 8Base-RHV-HypervisorBuild-4:redhat-virtualization-host-image-update-placeholder-0:4.4.9-3.el8ev.noarch	—	Workaround

Threats

Impact Critical

References

13 references

URL	Category
https://access.redhat.com/errata/RHSA-2021:5006	self
https://access.redhat.com/security/updates/classi…	external
https://access.redhat.com/security/vulnerabilitie…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2024370	external
https://bugzilla.redhat.com/show_bug.cgi?id=2029406	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2021-43527	self
https://bugzilla.redhat.com/show_bug.cgi?id=2024370	external
https://access.redhat.com/security/vulnerabilitie…	external
https://www.cve.org/CVERecord?id=CVE-2021-43527	external
https://nvd.nist.gov/vuln/detail/CVE-2021-43527	external
https://googleprojectzero.blogspot.com/2021/12/th…	external
https://www.mozilla.org/en-US/security/advisories…	external

Acknowledgments

Project Zero Tavis Ormandy

the Mozilla project

JSON

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          "text": "A remote code execution flaw was found in the way NSS verifies certificates. This flaw allows an attacker posing as an SSL/TLS server to trigger this issue in a client application compiled with NSS when it tries to initiate an SSL/TLS connection.  Similarly, a server application compiled with NSS, which processes client certificates, can receive a malicious certificate via a client, triggering the flaw. The highest threat to this vulnerability is confidentiality, integrity, as well as system availability.",
          "title": "Vulnerability description"
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          "text": "nss: Memory corruption in decodeECorDsaSignature with DSA signatures (and RSA-PSS)",
          "title": "Vulnerability summary"
        },
        {
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          "text": "The issue is not limited to TLS. Any applications that use NSS certificate verification are vulnerable; S/MIME is impacted as well.  Similarly, a server application compiled with NSS, which processes client certificates, can receive a malicious certificate via a client.\n\nFirefox is not vulnerable to this flaw as it uses the mozilla::pkix for certificate verification. Thunderbird is affected when parsing email with the S/MIME signature.  Thunderbird on Red Hat Enterprise Linux 8.4 and later does not need to be updated since it uses the system NSS library, but earlier Red Hat Enterprise Linux 8 extended life streams will need to update Thunderbird as well as NSS.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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            "8Base-RHV-Hypervisor-4:redhat-virtualization-host-image-update-0:4.4.9-202112061811_8.5.x86_64",
            "8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-3.el8ev.src",
            "8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-3.el8ev.x86_64",
            "8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-content-0:4.4.9-3.el8ev.x86_64",
            "8Base-RHV-HypervisorBuild-4:redhat-virtualization-host-image-update-placeholder-0:4.4.9-3.el8ev.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "8Base-RHV-Hypervisor-4:redhat-virtualization-host-0:4.4.9-202112061811_8.5.src",
            "8Base-RHV-Hypervisor-4:redhat-virtualization-host-image-update-0:4.4.9-202112061811_8.5.x86_64",
            "8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-3.el8ev.src",
            "8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-3.el8ev.x86_64",
            "8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-content-0:4.4.9-3.el8ev.x86_64",
            "8Base-RHV-HypervisorBuild-4:redhat-virtualization-host-image-update-placeholder-0:4.4.9-3.el8ev.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Critical"
        }
      ],
      "title": "nss: Memory corruption in decodeECorDsaSignature with DSA signatures (and RSA-PSS)"
    }
  ]
}

CVE-2021-43527 (GCVE-0-2021-43527)

Vulnerability from cvelistv5 – Published: 2021-12-08 00:00 – Updated: 2024-08-04 03:55

Summary

NSS (Network Security Services) versions prior to 3.73 or 3.68.1 ESR are vulnerable to a heap overflow when handling DER-encoded DSA or RSA-PSS signatures. Applications using NSS for handling signatures encoded within CMS, S/MIME, PKCS \#7, or PKCS \#12 are likely to be impacted. Applications using NSS for certificate validation or other TLS, X.509, OCSP or CRL functionality may be impacted, depending on how they configure NSS. *Note: This vulnerability does NOT impact Mozilla Firefox.* However, email clients and PDF viewers that use NSS for signature verification, such as Thunderbird, LibreOffice, Evolution and Evince are believed to be impacted. This vulnerability affects NSS < 3.73 and NSS < 3.68.1.

Severity

No CVSS data available.

CWE

Memory corruption via DER-encoded DSA and RSA-PSS signatures

Assigner

mozilla

References

9 references

URL	Tags
https://www.mozilla.org/security/advisories/mfsa2…
https://bugzilla.mozilla.org/show_bug.cgi?id=1737470
https://ftp.mozilla.org/pub/security/nss/releases…
https://ftp.mozilla.org/pub/security/nss/releases…
https://www.oracle.com/security-alerts/cpuapr2022.html
https://security.netapp.com/advisory/ntap-2021122…
https://cert-portal.siemens.com/productcert/pdf/s…
https://www.starwindsoftware.com/security/sw-2022…
https://security.gentoo.org/glsa/202212-05	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Mozilla	NSS	Affected: unspecified , < 3.73 (custom) Affected: unspecified , < 3.68.1 (custom)

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
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        "providerMetadata": {
          "dateUpdated": "2024-08-04T03:55:29.297Z",
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            "url": "https://www.mozilla.org/security/advisories/mfsa2021-51/"
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            "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1737470"
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            "url": "https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_73_RTM/"
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            "url": "https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_68_1_RTM/"
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            "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
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            "url": "https://security.netapp.com/advisory/ntap-20211229-0002/"
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            "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-594438.pdf"
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            ],
            "url": "https://www.starwindsoftware.com/security/sw-20220802-0001/"
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            "tags": [
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        ],
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    ],
    "cna": {
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              "status": "affected",
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        {
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        },
        {
          "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
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        },
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          "tags": [
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          ],
          "url": "https://security.gentoo.org/glsa/202212-05"
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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.

Action not permitted

RHSA-2021:5006

CVE-2021-43527 (GCVE-0-2021-43527)

Tags

Sightings

Nomenclature