Apache Tapestry 5.4.0 < 5.6.3, 5.7.0 < 5.7.1 RCE Vulnerability - Active Check

Published: 2021-05-21 06:28:17
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:N/C:C/I:C/A:C

Detection Type:
Remote Vulnerability

Solution Type:
Vendor Patch

Summary:
Apache Tapestry is prone to a remote code execution (RCE) vulnerability.

Detection Method:
Sends a crafted HTTP GET request and checks the response.

Technical Details:
An unauthenticated remote code execution vulnerability was found in Apache Tapestry. The vulnerability is a bypass of the fix for CVE-2019-0195. 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 path '/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'. Unfortunately, the blacklist solution can simply be bypassed by appending a '/' at the end of the path: '/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).

Affected Versions:
Apache Tapestry version 5.4.0 through 5.6.2 and 5.7.0.

Recommendations:
Update to version 5.6.3, 5.7.1 or later.

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2021-27850

References:

https://www.openwall.com/lists/oss-security/2021/04/15/1

Severity
High
CVSS Score
10.0
Published
2021-05-21
Modified
2021-05-21
Category
Web application abuses

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