#VU8114 Denial of service in Apache Struts - CVE-2017-9804

Vulnerability identifier: #VU8114

Vulnerability 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

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Apache Struts
Server applications / Frameworks for developing and running applications

Vendor: Apache Foundation

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

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

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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.