CVE-2023-34323 (GCVE-0-2023-34323)

Vulnerability from cvelistv5 – Published: 2024-01-05 16:30 – Updated: 2025-11-04 19:16
VLAI?
Summary
When a transaction is committed, C Xenstored will first check the quota is correct before attempting to commit any nodes. It would be possible that accounting is temporarily negative if a node has been removed outside of the transaction. Unfortunately, some versions of C Xenstored are assuming that the quota cannot be negative and are using assert() to confirm it. This will lead to C Xenstored crash when tools are built without -DNDEBUG (this is the default).
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
XEN
References
Impacted products
Vendor Product Version
Xen Xen Unknown: consult Xen advisory XSA-440
Create a notification for this product.
Credits
This issue was discovered by Stanislav Uschakow and Julien Grall, all from Amazon.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T19:16:36.587Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://xenbits.xenproject.org/xsa/advisory-440.html"
          },
          {
            "url": "http://xenbits.xen.org/xsa/advisory-440.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2023-34323",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-01-09T16:40:56.610734Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-476",
                "description": "CWE-476 NULL Pointer Dereference",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-06-18T15:46:24.091Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Xen",
          "vendor": "Xen",
          "versions": [
            {
              "status": "unknown",
              "version": "consult Xen advisory XSA-440"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "All versions of Xen up to and including 4.17 are vulnerable if XSA-326\nwas ingested.\n\nAll Xen systems using C Xenstored are vulnerable.  C Xenstored built\nusing -DNDEBUG (can be specified via EXTRA_CFLAGS_XEN_TOOLS=-DNDEBUG)\nare not vulnerable.  Systems using the OCaml variant of Xenstored are\nnot vulnerable.\n"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "This issue was discovered by Stanislav Uschakow and Julien Grall, all\nfrom Amazon.\n"
        }
      ],
      "datePublic": "2023-10-10T11:26:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "When a transaction is committed, C Xenstored will first check\nthe quota is correct before attempting to commit any nodes.  It would\nbe possible that accounting is temporarily negative if a node has\nbeen removed outside of the transaction.\n\nUnfortunately, some versions of C Xenstored are assuming that the\nquota cannot be negative and are using assert() to confirm it.  This\nwill lead to C Xenstored crash when tools are built without -DNDEBUG\n(this is the default).\n"
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "A malicious guest could craft a transaction that will hit the C\nXenstored bug and crash it.  This will result to the inability to\nperform any further domain administration like starting new guests,\nor adding/removing resources to or from any existing guest.\n"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-01-05T16:30:32.305Z",
        "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "shortName": "XEN"
      },
      "references": [
        {
          "url": "https://xenbits.xenproject.org/xsa/advisory-440.html"
        }
      ],
      "title": "xenstored: A transaction conflict can crash C Xenstored",
      "workarounds": [
        {
          "lang": "en",
          "value": "The problem can be avoided by using OCaml Xenstored variant.\n"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
    "assignerShortName": "XEN",
    "cveId": "CVE-2023-34323",
    "datePublished": "2024-01-05T16:30:32.305Z",
    "dateReserved": "2023-06-01T10:44:17.065Z",
    "dateUpdated": "2025-11-04T19:16:36.587Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*\", \"versionEndExcluding\": \"4.17.0\", \"matchCriteriaId\": \"3B65D9EE-AB21-4DF4-A578-679B6357308F\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"When a transaction is committed, C Xenstored will first check\\nthe quota is correct before attempting to commit any nodes.  It would\\nbe possible that accounting is temporarily negative if a node has\\nbeen removed outside of the transaction.\\n\\nUnfortunately, some versions of C Xenstored are assuming that the\\nquota cannot be negative and are using assert() to confirm it.  This\\nwill lead to C Xenstored crash when tools are built without -DNDEBUG\\n(this is the default).\\n\"}, {\"lang\": \"es\", \"value\": \"Cuando se confirma una transacci\\u00f3n, C Xenstored primero verificar\\u00e1 que la cuota sea correcta antes de intentar confirmar cualquier nodo. Ser\\u00eda posible que la contabilidad fuera temporalmente negativa si se hubiera eliminado un nodo fuera de la transacci\\u00f3n. Desafortunadamente, algunas versiones de C Xenstored asumen que la cuota no puede ser negativa y utilizan assert() para confirmarlo. Esto provocar\\u00e1 un bloqueo de C Xenstored cuando las herramientas se creen sin -DNDEBUG (este es el valor predeterminado). \"}]",
      "id": "CVE-2023-34323",
      "lastModified": "2024-11-21T08:07:00.780",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"baseScore\": 5.5, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 3.6}]}",
      "published": "2024-01-05T17:15:08.493",
      "references": "[{\"url\": \"https://xenbits.xenproject.org/xsa/advisory-440.html\", \"source\": \"security@xen.org\", \"tags\": [\"Patch\", \"Vendor Advisory\"]}, {\"url\": \"https://xenbits.xenproject.org/xsa/advisory-440.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Vendor Advisory\"]}]",
      "sourceIdentifier": "security@xen.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-476\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-34323\",\"sourceIdentifier\":\"security@xen.org\",\"published\":\"2024-01-05T17:15:08.493\",\"lastModified\":\"2025-11-04T20:16:30.553\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"When a transaction is committed, C Xenstored will first check\\nthe quota is correct before attempting to commit any nodes.  It would\\nbe possible that accounting is temporarily negative if a node has\\nbeen removed outside of the transaction.\\n\\nUnfortunately, some versions of C Xenstored are assuming that the\\nquota cannot be negative and are using assert() to confirm it.  This\\nwill lead to C Xenstored crash when tools are built without -DNDEBUG\\n(this is the default).\\n\"},{\"lang\":\"es\",\"value\":\"Cuando se confirma una transacci\u00f3n, C Xenstored primero verificar\u00e1 que la cuota sea correcta antes de intentar confirmar cualquier nodo. Ser\u00eda posible que la contabilidad fuera temporalmente negativa si se hubiera eliminado un nodo fuera de la transacci\u00f3n. Desafortunadamente, algunas versiones de C Xenstored asumen que la cuota no puede ser negativa y utilizan assert() para confirmarlo. Esto provocar\u00e1 un bloqueo de C Xenstored cuando las herramientas se creen sin -DNDEBUG (este es el valor predeterminado). \"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"4.17.0\",\"matchCriteriaId\":\"3B65D9EE-AB21-4DF4-A578-679B6357308F\"}]}]}],\"references\":[{\"url\":\"https://xenbits.xenproject.org/xsa/advisory-440.html\",\"source\":\"security@xen.org\",\"tags\":[\"Patch\",\"Vendor Advisory\"]},{\"url\":\"http://xenbits.xen.org/xsa/advisory-440.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://xenbits.xenproject.org/xsa/advisory-440.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Vendor Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://xenbits.xenproject.org/xsa/advisory-440.html\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T16:10:06.813Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-34323\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-01-09T16:40:56.610734Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-06-18T15:45:53.635Z\"}}], \"cna\": {\"title\": \"xenstored: A transaction conflict can crash C Xenstored\", \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"This issue was discovered by Stanislav Uschakow and Julien Grall, all\\nfrom Amazon.\\n\"}], \"impacts\": [{\"descriptions\": [{\"lang\": \"en\", \"value\": \"A malicious guest could craft a transaction that will hit the C\\nXenstored bug and crash it.  This will result to the inability to\\nperform any further domain administration like starting new guests,\\nor adding/removing resources to or from any existing guest.\\n\"}]}], \"affected\": [{\"vendor\": \"Xen\", \"product\": \"Xen\", \"versions\": [{\"status\": \"unknown\", \"version\": \"consult Xen advisory XSA-440\"}], \"defaultStatus\": \"unknown\"}], \"datePublic\": \"2023-10-10T11:26:00.000Z\", \"references\": [{\"url\": \"https://xenbits.xenproject.org/xsa/advisory-440.html\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"The problem can be avoided by using OCaml Xenstored variant.\\n\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"When a transaction is committed, C Xenstored will first check\\nthe quota is correct before attempting to commit any nodes.  It would\\nbe possible that accounting is temporarily negative if a node has\\nbeen removed outside of the transaction.\\n\\nUnfortunately, some versions of C Xenstored are assuming that the\\nquota cannot be negative and are using assert() to confirm it.  This\\nwill lead to C Xenstored crash when tools are built without -DNDEBUG\\n(this is the default).\\n\"}], \"configurations\": [{\"lang\": \"en\", \"value\": \"All versions of Xen up to and including 4.17 are vulnerable if XSA-326\\nwas ingested.\\n\\nAll Xen systems using C Xenstored are vulnerable.  C Xenstored built\\nusing -DNDEBUG (can be specified via EXTRA_CFLAGS_XEN_TOOLS=-DNDEBUG)\\nare not vulnerable.  Systems using the OCaml variant of Xenstored are\\nnot vulnerable.\\n\"}], \"providerMetadata\": {\"orgId\": \"23aa2041-22e1-471f-9209-9b7396fa234f\", \"shortName\": \"XEN\", \"dateUpdated\": \"2024-01-05T16:30:32.305Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-34323\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-06-18T15:46:24.091Z\", \"dateReserved\": \"2023-06-01T10:44:17.065Z\", \"assignerOrgId\": \"23aa2041-22e1-471f-9209-9b7396fa234f\", \"datePublished\": \"2024-01-05T16:30:32.305Z\", \"assignerShortName\": \"XEN\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.