A vulnerability classified as problematic has been found in OWASP ModSecurity Core Rule Set up to 3.1.0. This affects an unknown code block of the file /rules/REQUEST-932-APPLICATION-ATTACK-RCE.conf. The manipulation with an unknown input leads to a incorrect regex vulnerability. CWE is classifying the issue as CWE-185. The product specifies a regular expression in a way that causes data to be improperly matched or compared. This is going to have an impact on availability. The summary by CVE is:

An issue was discovered in OWASP ModSecurity Core Rule Set (CRS) through 3.1.0. /rules/REQUEST-932-APPLICATION-ATTACK-RCE.conf allows remote attackers to cause a denial of service (ReDOS) by entering a specially crafted string with nested repetition operators.

The bug was discovered 04/15/2019. The weakness was shared 04/21/2019. This vulnerability is uniquely identified as CVE-2019-11388 since 04/20/2019. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 6 days. During that time the estimated underground price was around $0-$5k. The real existence of this vulnerability is still doubted at the moment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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• OWASP

Name

• ModSecurity Core Rule Set

Version

• 3.0
• 3.1

License

• open-source

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