CVE-2021-33580: regex injection leading to DoS
First published: Wed Aug 18 2021(Updated: )
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.
Credit: security@apache.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Apache Roller | <6.0.2 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-33580?
The severity of CVE-2021-33580 is high.
What software is affected by CVE-2021-33580?
Apache Roller version up to 6.0.2 is affected by CVE-2021-33580.
How are user-controlled headers used in CVE-2021-33580?
User-controlled headers, such as 'Referer' in the HTTP request, are used to build and run a regex expression.
Can the attacker send a specially crafted Referer header programmatically?
Yes, the attacker can send a specially crafted Referer header programmatically without using a browser.
Are there any references related to CVE-2021-33580?
Yes, you can find references at [this link](http://www.openwall.com/lists/oss-security/2021/08/18/1) and [this link](https://lists.apache.org/thread.html/r9d967d80af941717573e531db2c7353a90bfd0886e9b5d5d79f75506%40%3Cuser.roller.apache.org%3E).
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