Vulnerability-Lookup

RHSA-2021:2032

Vulnerability from csaf_redhat - Published: 2021-05-19 10:31 - Updated: 2026-06-25 10:58

Summary

Red Hat Security Advisory: slapi-nis security and bug fix update

Severity

Important

Notes

Topic: An update for slapi-nis is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. 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 slapi-nis packages contain the NIS server plug-in and the Schema Compatibility plug-in for use with the 389 Directory Server. Security Fix(es): * slapi-nis: NULL dereference (DoS) with specially crafted Binding DN (CVE-2021-3480) 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-2021-3480

A flaw was found in slapi-nis. A NULL pointer dereference during the parsing of the Binding DN could allow an unauthenticated attacker to crash the 389-ds-base directory server. The highest threat from this vulnerability is to system availability.

7.5 (High)


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

CWE-476 - NULL Pointer Dereference

Affected products

Fixed 14 products

Product	Version	Remediation
Unresolved product id: 7Client-optional-7.9.Z:slapi-nis-0:0.56.5-4.el7_9.src	—	Vendor Fix fix Workaround
Unresolved product id: 7Client-optional-7.9.Z:slapi-nis-0:0.56.5-4.el7_9.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Client-optional-7.9.Z:slapi-nis-debuginfo-0:0.56.5-4.el7_9.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7ComputeNode-optional-7.9.Z:slapi-nis-0:0.56.5-4.el7_9.src	—	Vendor Fix fix Workaround
Unresolved product id: 7ComputeNode-optional-7.9.Z:slapi-nis-0:0.56.5-4.el7_9.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7ComputeNode-optional-7.9.Z:slapi-nis-debuginfo-0:0.56.5-4.el7_9.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-7.9.Z:slapi-nis-0:0.56.5-4.el7_9.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-7.9.Z:slapi-nis-0:0.56.5-4.el7_9.src	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-7.9.Z:slapi-nis-0:0.56.5-4.el7_9.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-7.9.Z:slapi-nis-debuginfo-0:0.56.5-4.el7_9.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-7.9.Z:slapi-nis-debuginfo-0:0.56.5-4.el7_9.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Workstation-7.9.Z:slapi-nis-0:0.56.5-4.el7_9.src	—	Vendor Fix fix Workaround
Unresolved product id: 7Workstation-7.9.Z:slapi-nis-0:0.56.5-4.el7_9.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Workstation-7.9.Z:slapi-nis-debuginfo-0:0.56.5-4.el7_9.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

8 references

URL	Category
https://access.redhat.com/errata/RHSA-2021:2032	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=1944640	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2021-3480	self
https://bugzilla.redhat.com/show_bug.cgi?id=1944640	external
https://www.cve.org/CVERecord?id=CVE-2021-3480	external
https://nvd.nist.gov/vuln/detail/CVE-2021-3480	external

Acknowledgments

Alexander Bokovoy

JSON

To clipboard

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      "cve": "CVE-2021-3480",
      "cwe": {
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        "name": "NULL Pointer Dereference"
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      "discovery_date": "2021-03-30T00:00:00+00:00",
      "ids": [
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        {
          "category": "description",
          "text": "A flaw was found in slapi-nis. A NULL pointer dereference during the parsing of the Binding DN could allow an unauthenticated attacker to crash the 389-ds-base directory server. The highest threat from this vulnerability is to system availability.",
          "title": "Vulnerability description"
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          "text": "slapi-nis: NULL dereference (DoS) with specially crafted Binding DN",
          "title": "Vulnerability summary"
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        {
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          "text": "This vulnerability affects Directory Server with the Schema Compatibility plugin \"slapi-nis\". To verify if an instance is configured with Schema Compatibility: \n$ ldapsearch -b \u0027cn=Schema Compatibility,cn=plugins,cn=config\u0027 -s base\n\nRed Hat Identity Management is affected by this flaw.",
          "title": "Statement"
        },
        {
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          "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.",
          "title": "CVSS score applicability"
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          "summary": "RHBZ#1944640",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1944640"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-3480",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-3480"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-3480",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3480"
        }
      ],
      "release_date": "2021-05-17T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-05-19T10:31:22+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
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            "7ComputeNode-optional-7.9.Z:slapi-nis-debuginfo-0:0.56.5-4.el7_9.x86_64",
            "7Server-7.9.Z:slapi-nis-0:0.56.5-4.el7_9.ppc64le",
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            "7Workstation-7.9.Z:slapi-nis-debuginfo-0:0.56.5-4.el7_9.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:2032"
        },
        {
          "category": "workaround",
          "details": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.",
          "product_ids": [
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          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "slapi-nis: NULL dereference (DoS) with specially crafted Binding DN"
    }
  ]
}

CVE-2021-3480 (GCVE-0-2021-3480)

Vulnerability from cvelistv5 – Published: 2021-05-20 12:14 – Updated: 2024-08-03 16:53

Summary

A flaw was found in slapi-nis in versions before 0.56.7. A NULL pointer dereference during the parsing of the Binding DN could allow an unauthenticated attacker to crash the 389-ds-base directory server. The highest threat from this vulnerability is to system availability.

Severity

No CVSS data available.

CWE

CWE-476

Assigner

redhat redhat root

References

3 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1944640	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA

Impacted products

1 product

Vendor	Product	Version
n/a	slapi-nis	Affected: slapi-nis 0.56.7

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.