Arbitrary Code Execution Affecting org.apache.tapestry:tapestry-core Open this link in a new tab package, versions [5.4.0,5.6.2) [5.7.0, 5.7.1)
Exploit Maturity
Proof of concept
Attack Complexity
Low
Confidentiality
High
Integrity
High
Availability
High
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snyk-id
SNYK-JAVA-ORGAPACHETAPESTRY-1246595
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published
15 Apr 2021
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disclosed
15 Apr 2021
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credit
Unknown
Introduced: 15 Apr 2021
CVE-2021-27850 Open this link in a new tabHow to fix?
Upgrade org.apache.tapestry:tapestry-core
to version 5.6.2, 5.7.1 or higher.
Overview
org.apache.tapestry:tapestry-core is a Tapestry Core package for Apache Tapestry.
Affected versions of this package are vulnerable to Arbitrary Code Execution. A critical unauthenticated remote code execution vulnerability was found in all recent versions of Apache Tapestry.
A bypass of the fix for CVE-2019-0195 exists. where the blacklist solution can simply be bypassed byappending 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 fileAppModule.class
is loaded into the response.This class usually contains the HMAC secret key which is used to signserialized Java objects.With the knowledge of that key an attacker can sign a Java gadget chain that leads to RCE.