#VU1961 Spoofing attack in Apache HTTP Server - CVE-2016-8743

Vulnerability identifier: #VU1961

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-8743

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Apache HTTP Server
Server applications / Web servers

Vendor: Apache Foundation

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to insufficient sanitization of HTTP request, which contain whitespace characters. A remote attacker can send a specially crafted HTTP request, containing CR, FF, VTAB characters followed by CRLF sequence and inject arbitrary data in server response.

Successful exploitation of this vulnerability may result in content spoofing, web cache poisoning and XSS attacks.

Mitigation
Install the latest version Apache HTTP Server 2.4.25 or 2.2.32.

Vulnerable software versions

Apache HTTP Server: 2.2.0 - 2.4.23

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External links
https://httpd.apache.org/security/vulnerabilities_24.html
https://www.apache.org/dist/httpd/CHANGES_2.2.32

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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.