CVE-2023-34319 (GCVE-0-2023-34319)

Vulnerability from cvelistv5 – Published: 2023-09-22 13:34 – Updated: 2025-11-04 19:16
VLAI?
Title
Linux: buffer overrun in netback due to unusual packet
Summary
The fix for XSA-423 added logic to Linux'es netback driver to deal with a frontend splitting a packet in a way such that not all of the headers would come in one piece. Unfortunately the logic introduced there didn't account for the extreme case of the entire packet being split into as many pieces as permitted by the protocol, yet still being smaller than the area that's specially dealt with to keep all (possible) headers together. Such an unusual packet would therefore trigger a buffer overrun in the driver.
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
XEN
References
Impacted products
Vendor Product Version
Linux Linux Unknown: consult Xen advisory XSA-432
Create a notification for this product.
Date Public ?
2023-09-19 12:00
Credits
This issue was discovered by Ross Lagerwall of Citrix.
Show details on NVD website
To clipboard 

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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://xenbits.xenproject.org/xsa/advisory-432.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20240202-0001/\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T16:10:06.547Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-34319\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-06-18T14:25:25.464362Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-787\", \"description\": \"CWE-787 Out-of-bounds Write\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-06-18T14:25:59.332Z\"}}], \"cna\": {\"title\": \"Linux: buffer overrun in netback due to unusual packet\", \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"This issue was discovered by Ross Lagerwall of Citrix.\"}], \"impacts\": [{\"descriptions\": [{\"lang\": \"en\", \"value\": \"An unprivileged guest can cause Denial of Service (DoS) of the host by sending network packets to the backend, causing the backend to crash.  Data corruption or privilege escalation seem unlikely but have not been ruled out.\"}]}], \"affected\": [{\"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"unknown\", \"version\": \"consult Xen advisory XSA-432\"}], \"defaultStatus\": \"unknown\"}], \"datePublic\": \"2023-09-19T12:00:00.000Z\", \"references\": [{\"url\": \"https://xenbits.xenproject.org/xsa/advisory-432.html\"}, {\"url\": \"http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20240202-0001/\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Using another PV network backend (e.g. the qemu based \\\"qnic\\\" backend)\\nwill mitigate the problem.\\n\\nUsing a dedicated network driver domain per guest will mitigate the\\nproblem.\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"The fix for XSA-423 added logic to Linux\u0027es netback driver to deal with\\na frontend splitting a packet in a way such that not all of the headers\\nwould come in one piece.  Unfortunately the logic introduced there\\ndidn\u0027t account for the extreme case of the entire packet being split\\ninto as many pieces as permitted by the protocol, yet still being\\nsmaller than the area that\u0027s specially dealt with to keep all (possible)\\nheaders together.  Such an unusual packet would therefore trigger a\\nbuffer overrun in the driver.\"}], \"configurations\": [{\"lang\": \"en\", \"value\": \"All systems using a Linux based network backend with kernel 3.19 and\\nnewer are vulnerable, on the assumption that the fix for XSA-423 was\\ntaken.  Systems using other network backends are not known to be\\nvulnerable.\"}], \"providerMetadata\": {\"orgId\": \"23aa2041-22e1-471f-9209-9b7396fa234f\", \"shortName\": \"XEN\", \"dateUpdated\": \"2024-02-02T14:06:14.314Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-34319\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-06-18T14:26:05.359Z\", \"dateReserved\": \"2023-06-01T10:44:17.064Z\", \"assignerOrgId\": \"23aa2041-22e1-471f-9209-9b7396fa234f\", \"datePublished\": \"2023-09-22T13:34:44.424Z\", \"assignerShortName\": \"XEN\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.