#VU12841 HTTP response splitting in Undertow - CVE-2017-12165

Vulnerability identifier: #VU12841

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-12165

CWE-ID: CWE-113

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Undertow
Server applications / Web servers

Vendor: Red Hat Inc.

Description
The vulnerability allows a remote attacker to write arbitrary files on the target system.

The weakness exists due to processing http request headers with unusual whitespaces. A remote attacker can trick the victim into opening specially crafted input and cause http request smuggling.

Vulnerable software versions

Undertow: All versions

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External links
https://github.com/undertow-io/undertow/commit/3436b03eda8b0b62c1855698c4d7c358add836c2

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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.