FKIE_CVE-2021-32749

Vulnerability from fkie_nvd - Published: 2021-07-16 18:15 - Updated: 2024-11-21 06:07
Severity ?
6.1 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N
8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
fail2ban is a daemon to ban hosts that cause multiple authentication errors. In versions 0.9.7 and prior, 0.10.0 through 0.10.6, and 0.11.0 through 0.11.2, there is a vulnerability that leads to possible remote code execution in the mailing action mail-whois. Command `mail` from mailutils package used in mail actions like `mail-whois` can execute command if unescaped sequences (`\n~`) are available in "foreign" input (for instance in whois output). To exploit the vulnerability, an attacker would need to insert malicious characters into the response sent by the whois server, either via a MITM attack or by taking over a whois server. The issue is patched in versions 0.10.7 and 0.11.3. As a workaround, one may avoid the usage of action `mail-whois` or patch the vulnerability manually.
References
security-advisories@github.comhttps://github.com/fail2ban/fail2ban/commit/2ed414ed09b3bb4c478abc9366a1ff22024a33c9Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/fail2ban/fail2ban/commit/410a6ce5c80dd981c22752da034f2529b5eee844Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/fail2ban/fail2ban/security/advisories/GHSA-m985-3f3v-cwmmExploit, Patch, Third Party Advisory
security-advisories@github.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5WHJK2X2MR2WDYZMCW7COZXJDUSDYMY6/
security-advisories@github.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZRYQ77MTX5WSV33VCJLK4KBKR55QZ7ZA/
security-advisories@github.comhttps://security.gentoo.org/glsa/202310-13
af854a3a-2127-422b-91ae-364da2661108https://github.com/fail2ban/fail2ban/commit/2ed414ed09b3bb4c478abc9366a1ff22024a33c9Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/fail2ban/fail2ban/commit/410a6ce5c80dd981c22752da034f2529b5eee844Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/fail2ban/fail2ban/security/advisories/GHSA-m985-3f3v-cwmmExploit, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5WHJK2X2MR2WDYZMCW7COZXJDUSDYMY6/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZRYQ77MTX5WSV33VCJLK4KBKR55QZ7ZA/
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202310-13
Impacted products
Vendor Product Version
fail2ban fail2ban *
fail2ban fail2ban *
fail2ban fail2ban *
fedoraproject fedora 34
fedoraproject fedora 35
To clipboard 

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      "value": "fail2ban is a daemon to ban hosts that cause multiple authentication errors. In versions 0.9.7 and prior, 0.10.0 through 0.10.6, and 0.11.0 through 0.11.2, there is a vulnerability that leads to possible remote code execution in the mailing action mail-whois. Command `mail` from mailutils package used in mail actions like `mail-whois` can execute command if unescaped sequences (`\\n~`) are available in \"foreign\" input (for instance in whois output). To exploit the vulnerability, an attacker would need to insert malicious characters into the response sent by the whois server, either via a MITM attack or by taking over a whois server. The issue is patched in versions 0.10.7 and 0.11.3. As a workaround, one may avoid the usage of action `mail-whois` or patch the vulnerability manually."
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      "lang": "es",
      "value": "fail2ban es un demonio para banear hosts que causan m\u00faltiples errores de autenticaci\u00f3n. En versiones 0.9.7 y anteriores, versiones 0.10.0 hasta 0.10.6, y versiones 0.11.0 hasta 0.11.2, se presenta una vulnerabilidad que conlleva a una posible ejecuci\u00f3n de c\u00f3digo remota en la acci\u00f3n de correo mail-whois. El comando \"mail\" del paquete mailutils usado en acciones de correo como \"mail-whois\" puede ejecutar comando si se presentan secuencias sin may\u00fasculas (\"\\n~\") en la entrada \"foreign\" (por ejemplo, en la salida de whois). Para explotar la vulnerabilidad, un atacante necesitar\u00eda insertar caracteres maliciosos en la respuesta enviada por el servidor whois, ya sea por medio de un ataque MITM o al tomar el control de un servidor whois. El problema est\u00e1 parcheado en las versiones 0.10.7 y 0.11.3. Como soluci\u00f3n, se puede evitar el uso de la acci\u00f3n \"mail-whois\" o parchear la vulnerabilidad manualmente"
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  "id": "CVE-2021-32749",
  "lastModified": "2024-11-21T06:07:39.953",
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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.