The Content-Encoding HTTP header feature in ws-xmlrpc 3.1.3 as used in Apache Archiva allows remote attackers to cause a denial of service (resource consumption) by decompressing a large file containing zeroes.

References

• https://nvd.nist.gov/vuln/detail/CVE-2016-5004
• https://github.com/0ang3el/unsafe-xmlrpc
• http://www.openwall.com/lists/oss-security/2016/07/12/5
• https://web.archive.org/web/20160716070844/http://www.securitytracker.com/id/1036294
• https://web.archive.org/web/20171111065719/http://www.securityfocus.com/bid/91736
• https://web.archive.org/web/20171114185236/https://0ang3el.blogspot.in/2016/07/beware-of-ws-xmlrpc-library-in-your.html