CVE-2021-27850 (GCVE-0-2021-27850)
Vulnerability from cvelistv5 – Published: 2021-04-15 07:40 – Updated: 2024-08-03 21:33
VLAI?
Summary
A critical unauthenticated remote code execution vulnerability was found all recent versions of Apache Tapestry. The affected versions include 5.4.5, 5.5.0, 5.6.2 and 5.7.0. The vulnerability I have found is a bypass of the fix for CVE-2019-0195. Recap: Before the fix of CVE-2019-0195 it was possible to download arbitrary class files from the classpath by providing a crafted asset file URL. An attacker was able to download the file `AppModule.class` by requesting the URL `http://localhost:8080/assets/something/services/AppModule.class` which contains a HMAC secret key. The fix for that bug was a blacklist filter that checks if the URL ends with `.class`, `.properties` or `.xml`. Bypass: Unfortunately, the blacklist solution can simply be bypassed by appending a `/` at the end of the URL: `http://localhost:8080/assets/something/services/AppModule.class/` The slash is stripped after the blacklist check and the file `AppModule.class` is loaded into the response. This class usually contains the HMAC secret key which is used to sign serialized Java objects. With the knowledge of that key an attacker can sign a Java gadget chain that leads to RCE (e.g. CommonsBeanUtils1 from ysoserial). Solution for this vulnerability: * For Apache Tapestry 5.4.0 to 5.6.1, upgrade to 5.6.2 or later. * For Apache Tapestry 5.7.0, upgrade to 5.7.1 or later.
Severity ?
No CVSS data available.
Assigner
References
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|---|---|---|---|---|---|---|---|---|---|---|---|
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Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Apache Software Foundation | Apache Tapestry |
Affected:
Apache Tapestry 5.5.0
Affected: Apache Tapestry 5.7.0 Affected: Apache Tapestry 5.4.5 , < Apache Tapestry 5.4.0* (custom) Affected: Apache Tapestry 5.6.2 , < Apache Tapestry 5.6.0* (custom) |
Credits
Apache Tapestry would like to thank Johannes Moritz for finding and notifying this vulnerability
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Bypass: Unfortunately, the blacklist solution can simply be bypassed by appending a `/` at the end of the URL: `http://localhost:8080/assets/something/services/AppModule.class/` The slash is stripped after the blacklist check and the file `AppModule.class` is loaded into the response. This class usually contains the HMAC secret key which is used to sign serialized Java objects. With the knowledge of that key an attacker can sign a Java gadget chain that leads to RCE (e.g. CommonsBeanUtils1 from ysoserial). Solution for this vulnerability: * For Apache Tapestry 5.4.0 to 5.6.1, upgrade to 5.6.2 or later. * For Apache Tapestry 5.7.0, upgrade to 5.7.1 or later.\"},{\"lang\":\"es\",\"value\":\"Se encontr\u00f3 una vulnerabilidad cr\u00edtica de ejecuci\u00f3n de c\u00f3digo remota no autenticado en todas las versiones recientes de Apache Tapestry.\u0026#xa0;Las versiones afectadas incluyen 5.4.5, 5.5.0, 5.6.2 y 5.7.0.\u0026#xa0;La vulnerabilidad encontrada es un desv\u00edo de la soluci\u00f3n para CVE-2019-0195.\u0026#xa0;Resumen: versiones anteriores a correcci\u00f3n de CVE-2019-0195, era posible descargar archivos de clases arbitrarios desde la ruta de clases proporcionando una URL de archivo de activos dise\u00f1ada.\u0026#xa0;Un atacante pudo descargar el archivo \\\"AppModule.class\\\" al requerir la URL \\\"http://localhost:8080/assets/something/services/AppModule.class\\\" que contiene una clave secreta HMAC.\u0026#xa0;La correcci\u00f3n para ese error fue un filtro de lista negra que verifica si la URL termina con \\\".class\\\",\\\" properties\\\" o \\\".xml\\\".\u0026#xa0;Omitir: Desafortunadamente, la soluci\u00f3n de lista negra puede simplemente ser omitida al agregar un \\\"/` al final de la URL: \\\"http: // localhost:8080/assets/something/services/AppModule.class/\\\". La barra es eliminada despu\u00e9s de la comprobaci\u00f3n de la lista negra y el archivo` AppModule.class` se carga en la respuesta.\u0026#xa0;Esta clase generalmente contiene la clave secreta HMAC que es usada para firmar objetos Java serializados.\u0026#xa0;Con el conocimiento de esa clave, un atacante puede firmar una cadena de dispositivos Java que conlleva a una RCE (por ejemplo, CommonsBeanUtils1 de ysoserial).\u0026#xa0;Soluci\u00f3n para esta vulnerabilidad: *Para Apache Tapestry versiones 5.4.0 hasta 5.6.1, actualice a versiones 5.6.2 o posteriores.\u0026#xa0;*Para Apache Tapestry versi\u00f3n 5.7.0, actualice a versiones 5.7.1 o posteriores\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:C/I:C/A:C\",\"baseScore\":10.0,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"COMPLETE\",\"integrityImpact\":\"COMPLETE\",\"availabilityImpact\":\"COMPLETE\"},\"baseSeverity\":\"HIGH\",\"exploitabilityScore\":10.0,\"impactScore\":10.0,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"security@apache.org\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-200\"},{\"lang\":\"en\",\"value\":\"CWE-502\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-502\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tapestry:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.0\",\"versionEndExcluding\":\"5.6.2\",\"matchCriteriaId\":\"5611789E-E882-49FF-9E33-A8612A394FE5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tapestry:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.7.0\",\"versionEndExcluding\":\"5.7.1\",\"matchCriteriaId\":\"4709FF63-6606-413B-941E-3E58DDA96203\"}]}]}],\"references\":[{\"url\":\"http://www.openwall.com/lists/oss-security/2021/04/15/1\",\"source\":\"security@apache.org\",\"tags\":[\"Exploit\",\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3E\",\"source\":\"security@apache.org\",\"tags\":[\"Mailing List\",\"Vendor Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20210528-0002/\",\"source\":\"security@apache.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2021/04/15/1\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3E\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Vendor Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20210528-0002/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}"
}
}
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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.
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