Vulnerability identifier: #VU8213

Vulnerability risk: Medium

CVSSv3.1: 8.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-12611

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: Yes

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

Vendor: Apache Foundation

Description
The vulnerability allows a remote attacker to execute arbitrary code.

The weakness exists due to the unsafe use of writable expression values in Freemarker content. A remote attacker can add malicious values to writable expressions that the attacker submits to the affected application for processing and execute arbitrary code in the security context of the affected application.

Mitigation
Update to version 2.5.12 or 2.3.34.

Vulnerable software versions

Apache Struts: 2.2.3 - 2.5.10.1

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External links
http://struts.apache.org/docs/s2-053.html

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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. However, proof of concept for this vulnerability is available.