CVE-2019-3822 (GCVE-0-2019-3822)

Vulnerability from cvelistv5 – Published: 2019-02-06 20:00 – Updated: 2024-08-04 19:19
VLAI?
Summary
libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow. The function creating an outgoing NTLM type-3 header (`lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()`), generates the request HTTP header contents based on previously received data. The check that exists to prevent the local buffer from getting overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from happening. This output data can grow larger than the local buffer if very large 'nt response' data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. Such a 'large value' needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header.
Severity ?
7.1 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
The curl Project curl Affected: 7.64.0
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow. The function creating an outgoing NTLM type-3 header (`lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()`), generates the request HTTP header contents based on previously received data. The check that exists to prevent the local buffer from getting overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from happening. This output data can grow larger than the local buffer if very large \u0027nt response\u0027 data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. Such a \u0027large value\u0027 needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header.\"}, {\"lang\": \"es\", \"value\": \"Libcurl, desde la versi\\u00f3n 7.36.0 hasta antes de la 7.64.0, es vulnerable a un desbordamiento de b\\u00fafer basado en pila. La funci\\u00f3n que crea una cabecera saliente NTLM de tipo 3 (\\\"lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()\\\") genera el contenido de la cabecera de petici\\u00f3n HTTP bas\\u00e1ndose en datos recibidos anteriormente. La comprobaci\\u00f3n para evitar que el b\\u00fafer local se desborde est\\u00e1 mal implementada (utilizando matem\\u00e1tica no firmada) y, as\\u00ed, no evita que el desbordamiento ocurra. Estos datos de salida pueden aumentar m\\u00e1s que el b\\u00fafer local si se extraen datos \\\"nt response\\\" muy grandes de una cabecera NTLMv2 previa, proporcionada por el servidor HTTP malicioso o roto. Este \\\"valor grande\\\" necesita ser de, aproximadamente, 1000 bytes o m\\u00e1s.  Los datos reales de la carga \\u00fatil que se copian al b\\u00fafer objetivo provienen de la cabecera de respuesta NTLMv2 de tipo 2.\"}]",
      "id": "CVE-2019-3822",
      "lastModified": "2024-11-21T04:42:36.923",
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      "published": "2019-02-06T20:29:00.353",
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  }
}


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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.