CVE-2021-27850 (GCVE-0-2021-27850)
Vulnerability from cvelistv5
Published
2021-04-15 07:40
Modified
2024-08-03 21:33
Severity ?
CWE
  • CWE-200 - Information Exposure
  • CWE-502 - Deserialization of Untrusted Data
Summary
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.
References
security@apache.orghttp://www.openwall.com/lists/oss-security/2021/04/15/1Exploit, Mailing List, Third Party Advisory
security@apache.orghttps://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3EMailing List, Vendor Advisory
security@apache.orghttps://security.netapp.com/advisory/ntap-20210528-0002/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/04/15/1Exploit, Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3EMailing List, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20210528-0002/Third Party Advisory
Impacted products
Vendor Product Version
Apache Software Foundation Apache Tapestry Version: Apache Tapestry 5.5.0
Version: Apache Tapestry 5.7.0
Version: Apache Tapestry 5.4.5   < Apache Tapestry 5.4.0*
Version: Apache Tapestry 5.6.2   < Apache Tapestry 5.6.0*
 Create a notification for this product.
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