#VU7117 Out-of-bound read in Apache HTTP Server - CVE-2017-7668

Vulnerability identifier: #VU7117

Vulnerability risk: Medium

CVSSv4.0: 6.6 [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:U/U:Green]

CVE-ID: CVE-2017-7668

CWE-ID: CWE-125

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 execute arbitrary code on the target system.

The vulnerability exists due to boundary error when processing token lists within ap_find_token() function. A remote unauthenticated attacker can create a specially crafted sequence of HTTP headers and refer to data past the end of the search string. 

Successful exploitation of this vulnerability results segmentation fault and web server crash.

Mitigation
Update to version 2.2.34 or 2.4.26.

Vulnerable software versions

Apache HTTP Server: 2.2.32 - 2.4.25

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External links
https://httpd.apache.org/security/vulnerabilities_22.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.