Improper access control in Apache Tapestry - CVE-2021-27850
Published: April 28, 2021 / Updated: September 14, 2021
Vulnerability identifier: #VU52713
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-27850
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions. A remote attacker can bypass implemented security restrictions and download the "AppModule.class" file and obtain the HMAC secret key.
Affected software
Apache Tapestry
How to mitigate CVE-2021-27850
Install updates from vendor's website.
Apache Tapestry - addressed in versions 5.6.2, 5.7.1
Links to Public Exploits and PoC-codes
- Exploit #6745 - CVE-2021-27850_POC (A Proof of concept for CVE-2021-27850 affecting Apache Tapestry and leading to unauthencticated remote code execution.) (September 14, 2021)
- Exploit #6548 - Apache Tapestry HMAC secret key leak (July 22, 2021)
- Exploit #6517 - CVE_2021_27850_POC (Apache Tapestry CVE-2021-27850 PoC) (July 4, 2021)
- Exploit #6471 - CVE-2021-27850_POC (A Proof of concept for CVE-2021-27850 affecting Apache Tapestry and leading to unauthencticated remote code execution.) (June 25, 2021)