Description

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.

Metrics

 

CVSS Version 4.0 CVSS Version 3.x CVSS Version 2.0

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score:  9.8 CRITICAL

Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS 2.0 Severity and Vector Strings:

NIST: NVD

Base Score:  10.0 HIGH

Vector:  (AV:N/AC:L/Au:N/C:C/I:C/A:C)

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
http://www.openwall.com/lists/oss-security/2021/04/15/1	Exploit  Mailing List  Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/04/15/1	Exploit  Mailing List  Third Party Advisory
https://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3E	Mailing List  Vendor Advisory
https://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3E	Mailing List  Vendor Advisory
https://security.netapp.com/advisory/ntap-20210528-0002/	Third Party Advisory
https://security.netapp.com/advisory/ntap-20210528-0002/	Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-502	Deserialization of Untrusted Data	NIST   Apache Software Foundation
CWE-200	Exposure of Sensitive Information to an Unauthorized Actor	Apache Software Foundation

Known Affected Software Configurations Switch to CPE 2.2

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Change History

6 change records found show changes

CVE Modified by CVE 11/21/2024 12:58:38 AM

Action	Type	Old Value	New Value
Added	Reference		http://www.openwall.com/lists/oss-security/2021/04/15/1
Added	Reference		https://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3E
Added	Reference		https://security.netapp.com/advisory/ntap-20210528-0002/

CVE Modified by Apache Software Foundation 5/14/2024 4:40:34 AM

Action	Type	Old Value	New Value

Modified Analysis by NIST 6/02/2021 11:15:24 AM

Action	Type	Old Value	New Value
Changed	Reference Type	https://security.netapp.com/advisory/ntap-20210528-0002/ No Types Assigned	https://security.netapp.com/advisory/ntap-20210528-0002/ Third Party Advisory

CVE Modified by Apache Software Foundation 5/28/2021 6:15:08 AM

Action	Type	Old Value	New Value
Added	Reference		https://security.netapp.com/advisory/ntap-20210528-0002/ [No Types Assigned]

Initial Analysis by NIST 4/22/2021 9:07:46 AM

Action	Type	Old Value	New Value
Added	CVSS V3.1		NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Added	CVSS V2		NIST (AV:N/AC:L/Au:N/C:C/I:C/A:C)
Added	CWE		NIST CWE-502
Added	CPE Configuration		OR *cpe:2.3:a:apache:tapestry:*:*:*:*:*:*:*:* versions from (including) 5.4.0 up to (excluding) 5.6.2 *cpe:2.3:a:apache:tapestry:*:*:*:*:*:*:*:* versions from (including) 5.7.0 up to (excluding) 5.7.1
Changed	Reference Type	http://www.openwall.com/lists/oss-security/2021/04/15/1 No Types Assigned	http://www.openwall.com/lists/oss-security/2021/04/15/1 Exploit, Mailing List, Third Party Advisory
Changed	Reference Type	https://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3E No Types Assigned	https://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3E Mailing List, Vendor Advisory

CVE Modified by Apache Software Foundation 4/15/2021 8:15:13 AM

Action	Type	Old Value	New Value
Added	Reference		http://www.openwall.com/lists/oss-security/2021/04/15/1 [No Types Assigned]