Denial of service in Apache Struts

1) Denial of service

EUVDB-ID: #VU8114

Risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-9804

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition.

The weakness exists due to server process overload when performing validation of the URL. A remote attacker can supply a specially crafted URL in a form field to trigger an error in regular expression (regex) processin, consume excessive CPU resources and cause the application to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

The vulnerability is addressed in the following versions: 2.5.13 and 2.3.34.

Vulnerable software versions

Apache Struts: 2.3.7 - 2.5.12

CPE2.3

• cpe:2.3:a:apache_foundation:struts:2.3.7:*:*:*:*:apache_tomcat:*:*
• cpe:2.3:a:apache_foundation:struts:*:*:*:*:*:apache_tomcat:*:*
• cpe:2.3:a:apache_foundation:struts:2.3.10:*:*:*:*:apache_tomcat:*:*
• cpe:2.3:a:apache_foundation:struts:2.3.11:*:*:*:*:apache_tomcat:*:*
• cpe:2.3:a:apache_foundation:struts:2.3.12:*:*:*:*:apache_tomcat:*:*
• cpe:2.3:a:apache_foundation:struts:2.3.14.1:*:*:*:*:apache_tomcat:*:*
• cpe:2.3:a:apache_foundation:struts:2.3.14.2:*:*:*:*:apache_tomcat:*:*

External links

https://cwiki.apache.org/confluence/display/WW/S2-051

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.