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

Information

Severity

Severity

Critical

Family

Family

Web application abuses

CVSSv2 Base

CVSSv2 Base

10.0

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Solution Type

Solution Type

Vendor Patch

Created

Created

2 years ago

Modified

Modified

2 years ago

Summary

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

Insight

Insight

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 Software

Affected Software

Apache Tapestry version 5.4.0 through 5.6.2 and 5.7.0.

Detection Method

Detection Method

Sends a crafted HTTP GET request and checks the response.

Solution

Solution

Update to version 5.6.3, 5.7.1 or later.

Common Vulnerabilities and Exposures (CVE)