CVE-2021-1368 (GCVE-0-2021-1368)

Vulnerability from cvelistv5 – Published: 2021-02-24 19:30 – Updated: 2024-11-08 23:37
VLAI
Title
Cisco FXOS and NX-OS Software Unidirectional Link Detection Denial of Service and Arbitrary Code Execution Vulnerability
Summary
A vulnerability in the Unidirectional Link Detection (UDLD) feature of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to execute arbitrary code with administrative privileges or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted Cisco UDLD protocol packets to a directly connected, affected device. A successful exploit could allow the attacker to execute arbitrary code with administrative privileges or cause the Cisco UDLD process to crash and restart multiple times, causing the affected device to reload and resulting in a DoS condition. Note: The UDLD feature is disabled by default, and the conditions to exploit this vulnerability are strict. The attacker needs full control of a directly connected device. That device must be connected over a port channel that has UDLD enabled. To trigger arbitrary code execution, both the UDLD-enabled port channel and specific system conditions must exist. In the absence of either the UDLD-enabled port channel or the system conditions, attempts to exploit this vulnerability will result in a DoS condition. It is possible, but highly unlikely, that an attacker could control the necessary conditions for exploitation. The CVSS score reflects this possibility. However, given the complexity of exploitation, Cisco has assigned a Medium Security Impact Rating (SIR) to this vulnerability.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-11-08 20:20 UTC
CWE
Assigner
cisco CNA under the mitre root
CNA scorecard C 66/100 over 431 records in the last 180 days details
References
URL Tags
https://tools.cisco.com/security/center/content/C… vendor-advisoryx_refsource_CISCO
Impacted products
Vendor Product Version CPE status
Cisco Cisco NX-OS Software Affected: n/a
guessed Create a notification for this product.
Date Public
2021-02-24 00:00
Show details on NVD website
To clipboard 

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            "value": "A vulnerability in the Unidirectional Link Detection (UDLD) feature of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to execute arbitrary code with administrative privileges or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted Cisco UDLD protocol packets to a directly connected, affected device. A successful exploit could allow the attacker to execute arbitrary code with administrative privileges or cause the Cisco UDLD process to crash and restart multiple times, causing the affected device to reload and resulting in a DoS condition. Note: The UDLD feature is disabled by default, and the conditions to exploit this vulnerability are strict. The attacker needs full control of a directly connected device. That device must be connected over a port channel that has UDLD enabled. To trigger arbitrary code execution, both the UDLD-enabled port channel and specific system conditions must exist. In the absence of either the UDLD-enabled port channel or the system conditions, attempts to exploit this vulnerability will result in a DoS condition. It is possible, but highly unlikely, that an attacker could control the necessary conditions for exploitation. The CVSS score reflects this possibility. However, given the complexity of exploitation, Cisco has assigned a Medium Security Impact Rating (SIR) to this vulnerability."
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            "lang": "es",
            "value": "Una vulnerabilidad en la funcionalidad Unidirectional Link Detection (UDLD) del Software Cisco FXOS y el Software Cisco NX-OS, podr\u00eda permitir a un atacante adyacente no autenticado ejecutar c\u00f3digo arbitrario con privilegios administrativos o causar una condici\u00f3n de denegaci\u00f3n de servicio (DoS) en un dispositivo afectado.\u0026#xa0;Esta vulnerabilidad es debido a una comprobaci\u00f3n de entrada insuficiente.\u0026#xa0;Un atacante podr\u00eda explotar esta vulnerabilidad mediante el env\u00edo de paquetes de protocolo Cisco UDLD dise\u00f1ados a un dispositivo afectado directamente conectado.\u0026#xa0;Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante ejecutar c\u00f3digo arbitrario con privilegios administrativos o hacer que el proceso de UDLD de Cisco se bloquee y se reinicie varias veces, causando que el dispositivo afectado se recargue y resulte en una condici\u00f3n de DoS.\u0026#xa0;Nota: La funci\u00f3n UDLD est\u00e1 deshabilitada por defecto y las condiciones para explotar esta vulnerabilidad son estrictas.\u0026#xa0;El atacante necesita el control total de un dispositivo conectado directamente.\u0026#xa0;Ese dispositivo debe estar conectado a trav\u00e9s de un canal de puerto que tenga UDLD habilitado.\u0026#xa0;Para activar la ejecuci\u00f3n de c\u00f3digo arbitraria, deben existir tanto el canal de puerto habilitado para UDLD como las condiciones espec\u00edficas del sistema.\u0026#xa0;En ausencia del canal de puerto habilitado para UDLD o de las condiciones del sistema, los intentos de explotar esta vulnerabilidad resultar\u00e1n en una condici\u00f3n de DoS.\u0026#xa0;Es posible, pero muy poco probable, que un atacante pueda controlar las condiciones necesarias para la explotaci\u00f3n.\u0026#xa0;La puntuaci\u00f3n CVSS refleja esta posibilidad.\u0026#xa0;Sin embargo, dada la complejidad de la explotaci\u00f3n, Cisco ha asignado una calificaci\u00f3n de impacto de seguridad media (SIR) a esta vulnerabilidad"
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        "id": "CVE-2021-1368",
        "lastModified": "2024-11-21T05:44:11.723",
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}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.