#VU5234 Security bypass in Apache Struts - CVE-2014-0094

Vulnerability identifier: #VU5234

Vulnerability risk: Critical

CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:A/U:Red]

CVE-ID: CVE-2014-0094

CWE-ID: CWE-264

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 bypass security restsrictions on the target system.

The weakness exists due to an error in ParametersInterceptor. A remote attacker can use a specially crafted class parameter to manipulate the ClassLoader used by the application server.

Successful exploitation of the vulnerability results in security bypass on the vulnerable system.

Note: the vulnerability was being actively exploited.

Mitigation
Update to version 2.3.16.2.

Vulnerable software versions

Apache Struts: 2.0.0 - 2.3.16.1

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External links
https://cwiki.apache.org/confluence/display/WW/S2-020

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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, a fully functional exploit for this vulnerability is available.