#VU5233 Infinite loop in Apache Commons FileUpload - CVE-2014-0050

Vulnerability identifier: #VU5233

Vulnerability risk: Medium

CVSSv4.0: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:A/U:Green]

CVE-ID: CVE-2014-0050

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: Yes

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

Vendor: Apache Foundation

Description
The vulnerability allows a remote attacker to cause DoS conditions on the target system.

The weakness exists due to boundary error when handling Content-Type HTTP header for multipart requests. By sending a specially crafted Content-Type header, containing 4092 characters in "boundary" field, a remote attacker can cause the application to enter into an infinite loop.

Successful exploitation of the vulnerability results in denial of service on the vulnerable system.

Note: the vulnerability was being actively exploited.

Mitigation
Update Apache Struts to version 2.3.16.1.
For Apache Commons FileUpload install version 1.3.1.

Vulnerable software versions

Apache Commons FileUpload: 1.0 - 1.3

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External links
https://svn.apache.org/viewvc?view=revision&revision=1565143

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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.