264 lines
14 KiB
JSON
264 lines
14 KiB
JSON
{
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"containers": {
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"cna": {
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"affected": [
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{
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"product": "Apache Tapestry",
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"vendor": "Apache Software Foundation",
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"versions": [
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{
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"status": "affected",
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"version": "Apache Tapestry 5.5.0"
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},
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{
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"status": "affected",
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"version": "Apache Tapestry 5.7.0"
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},
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{
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"lessThan": "Apache Tapestry 5.4.0*",
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"status": "affected",
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"version": "Apache Tapestry 5.4.5",
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"versionType": "custom"
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},
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{
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"lessThan": "Apache Tapestry 5.6.0*",
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"status": "affected",
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"version": "Apache Tapestry 5.6.2",
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"lang": "en",
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"value": "Apache Tapestry would like to thank Johannes Moritz for finding and notifying this vulnerability"
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"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."
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"cweId": "CWE-200",
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"description": "CWE-200 Information Exposure",
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"lang": "en",
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"type": "CWE"
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"dateUpdated": "2021-05-28T09:06:12.000Z",
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"name": "[oss-security] 20210414 CVE-2021-27850: Apache Tapestry: Bypass of the fix for CVE-2019-0195",
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"defect": [
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"TAP5-2663"
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