CVE-2024-35235 (GCVE-0-2024-35235)

Vulnerability from cvelistv5 – Published: 2024-06-11 14:13 – Updated: 2025-02-21 16:56
VLAI
Title
Cupsd Listen arbitrary chmod 0140777
Summary
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.8 and earlier, when starting the cupsd server with a Listen configuration item pointing to a symbolic link, the cupsd process can be caused to perform an arbitrary chmod of the provided argument, providing world-writable access to the target. Given that cupsd is often running as root, this can result in the change of permission of any user or system files to be world writable. Given the aforementioned Ubuntu AppArmor context, on such systems this vulnerability is limited to those files modifiable by the cupsd process. In that specific case it was found to be possible to turn the configuration of the Listen argument into full control over the cupsd.conf and cups-files.conf configuration files. By later setting the User and Group arguments in cups-files.conf, and printing with a printer configured by PPD with a `FoomaticRIPCommandLine` argument, arbitrary user and group (not root) command execution could be achieved, which can further be used on Ubuntu systems to achieve full root command execution. Commit ff1f8a623e090dee8a8aadf12a6a4b25efac143d contains a patch for the issue.
Severity
4.4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
  • CWE-252 - Unchecked Return Value
Assigner
References
Impacted products
Vendor Product Version
OpenPrinting cups Affected: <= 2.4.8
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En las versiones 2.4.8 y anteriores, al iniciar el servidor cupsd con un elemento de configuraci\u00f3n Listen que apunta a un enlace simb\u00f3lico, se puede hacer que el proceso cupsd realice un chmod arbitrario del argumento proporcionado, proporcionando acceso de escritura mundial al destino. Dado que cupsd a menudo se ejecuta como root, esto puede resultar en el cambio de permiso de cualquier usuario o archivo del sistema para que se pueda escribir en todo el mundo. Dado el contexto de Ubuntu AppArmor antes mencionado, en dichos sistemas esta vulnerabilidad se limita a aquellos archivos modificables por el proceso cupsd. En ese caso espec\u00edfico, se descubri\u00f3 que era posible convertir la configuraci\u00f3n del argumento Listen en control total sobre los archivos de configuraci\u00f3n cupsd.conf y cups-files.conf. Al configurar posteriormente los argumentos Usuario y Grupo en cups-files.conf e imprimir con una impresora configurada por PPD con un argumento `FoomaticRIPCommandLine`, se podr\u00eda lograr la ejecuci\u00f3n de comandos arbitrarios de usuarios y grupos (no root), que se pueden usar a\u00fan m\u00e1s en Sistemas Ubuntu para lograr la ejecuci\u00f3n completa del comando root. El commit ff1f8a623e090dee8a8aadf12a6a4b25efac143d contiene un parche para el problema.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N\",\"baseScore\":4.4,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":0.8,\"impactScore\":3.6},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":6.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":0.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-59\"},{\"lang\":\"en\",\"value\":\"CWE-252\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openprinting:cups:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"2.4.8\",\"matchCriteriaId\":\"62C2C72D-4BC1-4584-9F3E-7FAE51E6BE2E\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"07B237A9-69A3-4A9C-9DA0-4E06BD37AE73\"}]}]}],\"references\":[{\"url\":\"http://www.openwall.com/lists/oss-security/2024/06/11/1\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Exploit\",\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2024/06/12/4\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Mailing List\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2024/06/12/5\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Mailing List\"]},{\"url\":\"https://git.launchpad.net/ubuntu/+source/apparmor/tree/profiles/apparmor.d/abstractions/user-tmp#n21\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Product\"]},{\"url\":\"https://github.com/OpenPrinting/cups/blob/aba917003c8de55e5bf85010f0ecf1f1ddd1408e/cups/http-addr.c#L229-L240\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Product\"]},{\"url\":\"https://github.com/OpenPrinting/cups/commit/ff1f8a623e090dee8a8aadf12a6a4b25efac143d\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Patch\"]},{\"url\":\"https://github.com/OpenPrinting/cups/security/advisories/GHSA-vvwp-mv6j-hw6f\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Exploit\",\"Vendor Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00001.html\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Mailing List\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2024/06/11/1\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2024/06/12/4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2024/06/12/5\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2024/11/08/3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\"]},{\"url\":\"https://git.launchpad.net/ubuntu/+source/apparmor/tree/profiles/apparmor.d/abstractions/user-tmp#n21\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Product\"]},{\"url\":\"https://github.com/OpenPrinting/cups/blob/aba917003c8de55e5bf85010f0ecf1f1ddd1408e/cups/http-addr.c#L229-L240\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Product\"]},{\"url\":\"https://github.com/OpenPrinting/cups/commit/ff1f8a623e090dee8a8aadf12a6a4b25efac143d\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://github.com/OpenPrinting/cups/security/advisories/GHSA-vvwp-mv6j-hw6f\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Vendor Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\"]}]}}",
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By later setting the User and Group arguments in cups-files.conf, and printing with a printer configured by PPD with a `FoomaticRIPCommandLine` argument, arbitrary user and group (not root) command execution could be achieved, which can further be used on Ubuntu systems to achieve full root command execution. Commit ff1f8a623e090dee8a8aadf12a6a4b25efac143d contains a patch for the issue.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-59\", \"description\": \"CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-252\", \"description\": \"CWE-252: Unchecked Return Value\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2024-06-14T03:06:28.702Z\"}}}",
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      "dataType": "CVE_RECORD",
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    }
  }
}


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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.