User controlled `request.getHeader("Referer")`, `request.getRequestURL()` and `request.getQueryString()` are used to build and run a regex expression. The attacker doesn't have to use a browser and may send a specially crafted Referer header programmatically. Since the attacker controls the string and the regex pattern he may cause a ReDoS by regex catastrophic backtracking on the server side. This problem has been fixed in Roller 6.0.2.
Workaround:
The product does not properly control the allocation and maintenance of a limited resource.
| Link | Tags |
|---|---|
| https://lists.apache.org/thread.html/r9d967d80af941717573e531db2c7353a90bfd0886e9b5d5d79f75506%40%3Cuser.roller.apache.org%3E | mailing list vendor advisory |
| http://www.openwall.com/lists/oss-security/2021/08/18/1 | third party advisory mailing list |