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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLW1qOHgtY3ByOC14Mzlo
Remote code execution in Apache Tapestry
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 5.6.2, upgrade to 5.6.3 or later. * For Apache Tapestry 5.7.0, upgrade to 5.7.1 or later.
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLW1qOHgtY3ByOC14Mzlo
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Critical
Classification: General
Published: about 3 years ago
Updated: over 1 year ago
Identifiers: GHSA-mj8x-cpr8-x39h, CVE-2021-27850
References:
- https://nvd.nist.gov/vuln/detail/CVE-2021-27850
- https://issues.apache.org/jira/browse/TAP5-2663
- https://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3E
- http://www.openwall.com/lists/oss-security/2021/04/15/1
- https://security.netapp.com/advisory/ntap-20210528-0002/
- https://github.com/advisories/GHSA-mj8x-cpr8-x39h
Affected Packages
maven:org.apache.tapestry:tapestry-core
Dependent packages: 140Dependent repositories: 770
Downloads:
Affected Version Ranges: >= 5.7.0, < 5.7.1, >= 5.4.0, < 5.6.3
Fixed in: 5.7.1, 5.6.3
All affected versions: 5.4.0, 5.4.1, 5.4.2, 5.4.3, 5.4.4, 5.4.5, 5.5.0, 5.6.0, 5.6.1, 5.6.2, 5.7.0
All unaffected versions: 5.0.1, 5.0.2, 5.0.3, 5.0.4, 5.0.5, 5.0.6, 5.0.7, 5.0.9, 5.0.10, 5.0.11, 5.0.12, 5.0.13, 5.0.14, 5.0.15, 5.0.16, 5.0.17, 5.0.18, 5.0.19, 5.2.0, 5.2.1, 5.2.2, 5.2.4, 5.2.5, 5.2.6, 5.3.0, 5.3.1, 5.3.2, 5.3.3, 5.3.4, 5.3.5, 5.3.6, 5.3.7, 5.3.8, 5.6.3, 5.6.4, 5.7.1, 5.7.2, 5.7.3, 5.8.0, 5.8.1, 5.8.2, 5.8.3, 5.8.4, 5.8.5, 5.8.6, 5.8.7