{ "containers": { "cna": { "affected": [ { "product": "Apache Tapestry", "vendor": "Apache Software Foundation", "versions": [ { "status": "affected", "version": "Apache Tapestry 5.5.0" }, { "status": "affected", "version": "Apache Tapestry 5.7.0" }, { "lessThan": "Apache Tapestry 5.4.0*", "status": "affected", "version": "Apache Tapestry 5.4.5", "versionType": "custom" }, { "lessThan": "Apache Tapestry 5.6.0*", "status": "affected", "version": "Apache Tapestry 5.6.2", "versionType": "custom" } ] } ], "credits": [ { "lang": "en", "value": "Apache Tapestry would like to thank Johannes Moritz for finding and notifying this vulnerability" } ], "descriptions": [ { "lang": "en", "value": "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." } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-200", "description": "CWE-200 Information Exposure", "lang": "en", "type": "CWE" } ] }, { "descriptions": [ { "cweId": "CWE-502", "description": "CWE-502 Deserialization of Untrusted Data", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "dateUpdated": "2021-05-28T09:06:12.000Z", "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache" }, "references": [ { "tags": [ "x_refsource_MISC" ], "url": "https://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3E" }, { "name": "[oss-security] 20210414 CVE-2021-27850: Apache Tapestry: Bypass of the fix for CVE-2019-0195", "tags": [ "mailing-list", "x_refsource_MLIST" ], "url": "http://www.openwall.com/lists/oss-security/2021/04/15/1" }, { "tags": [ "x_refsource_CONFIRM" ], "url": "https://security.netapp.com/advisory/ntap-20210528-0002/" } ], "source": { "defect": [ "TAP5-2663" ], "discovery": "UNKNOWN" }, "title": "Bypass of the fix for CVE-2019-0195", "x_generator": { "engine": "Vulnogram 0.0.9" }, "x_legacyV4Record": { "CVE_data_meta": { "ASSIGNER": "security@apache.org", "ID": "CVE-2021-27850", "STATE": "PUBLIC", "TITLE": "Bypass of the fix for CVE-2019-0195" }, "affects": { "vendor": { "vendor_data": [ { "product": { "product_data": [ { "product_name": "Apache Tapestry", "version": { "version_data": [ { "version_affected": ">=", "version_name": "Apache Tapestry 5.4.0", "version_value": "Apache Tapestry 5.4.5" }, { "version_affected": "=", "version_name": "Apache Tapestry 5.5.0", "version_value": "Apache Tapestry 5.5.0" }, { "version_affected": ">=", "version_name": "Apache Tapestry 5.6.0", "version_value": "Apache Tapestry 5.6.2" }, { "version_affected": "=", "version_name": "Apache Tapestry 5.7.0", "version_value": "Apache Tapestry 5.7.0" } ] } } ] }, "vendor_name": "Apache Software Foundation" } ] } }, "credit": [ { "lang": "eng", "value": "Apache Tapestry would like to thank Johannes Moritz for finding and notifying this vulnerability" } ], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "eng", "value": "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." } ] }, "generator": { "engine": "Vulnogram 0.0.9" }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "CWE-200 Information Exposure" } ] }, { "description": [ { "lang": "eng", "value": "CWE-502 Deserialization of Untrusted Data" } ] } ] }, "references": { "reference_data": [ { "name": "https://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3E", "refsource": "MISC", "url": "https://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3E" }, { "name": "[oss-security] 20210414 CVE-2021-27850: Apache Tapestry: Bypass of the fix for CVE-2019-0195", "refsource": "MLIST", "url": "http://www.openwall.com/lists/oss-security/2021/04/15/1" }, { "name": "https://security.netapp.com/advisory/ntap-20210528-0002/", "refsource": "CONFIRM", "url": "https://security.netapp.com/advisory/ntap-20210528-0002/" } ] }, "source": { "defect": [ "TAP5-2663" ], "discovery": "UNKNOWN" } } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T21:33:15.996Z" }, "title": "CVE Program Container", "references": [ { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3E" }, { "name": "[oss-security] 20210414 CVE-2021-27850: Apache Tapestry: Bypass of the fix for CVE-2019-0195", "tags": [ "mailing-list", "x_refsource_MLIST", "x_transferred" ], "url": "http://www.openwall.com/lists/oss-security/2021/04/15/1" }, { "tags": [ "x_refsource_CONFIRM", "x_transferred" ], "url": "https://security.netapp.com/advisory/ntap-20210528-0002/" } ] } ] }, "cveMetadata": { "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "assignerShortName": "apache", "cveId": "CVE-2021-27850", "datePublished": "2021-04-15T07:40:11.000Z", "dateReserved": "2021-03-01T00:00:00.000Z", "dateUpdated": "2024-08-03T21:33:15.996Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1" }