| VID |
22766 |
| Severity |
40 |
| Port |
80, ... |
| Protocol |
TCP |
| Class |
WWW |
| Detailed Description |
According to its banner, the version of Apache 2.4 installed on the remote host is a version prior to 2.4.25. It is, therefore, affected by the following vulnerabilities :
- A flaw exists in the mod_session_crypto module due to encryption for data and cookies using the configured ciphers with possibly either CBC or ECB modes of operation (AES256-CBC by default). An unauthenticated, remote attacker can exploit this, via a padding oracle attack, to decrypt information without knowledge of the encryption key, resulting in the disclosure of potentially sensitive information. (CVE-2016-0736)
- A denial of service vulnerability exists in the mod_auth_digest module during client entry allocation. An unauthenticated, remote attacker can exploit this, via specially crafted input, to exhaust shared memory resources, resulting in a server crash. (CVE-2016-2161)
- The Apache HTTP Server is affected by a man-in-the-middle vulnerability known as 'httpoxy' due to a failure to properly resolve namespace conflicts in accordance with RFC 3875 section 4.1.18. The HTTP_PROXY environment variable is set based on untrusted user data in the 'Proxy' header of HTTP requests. The HTTP_PROXY environment variable is used by some web client libraries to specify a remote proxy server. An unauthenticated, remote attacker can exploit this, via a crafted 'Proxy' header in an HTTP request, to redirect an application's internal HTTP traffic to an arbitrary proxy server where it may be observed or anipulated. (CVE-2016-5387)
- A denial of service vulnerability exists in the mod_http2 module due to improper handling of the LimitRequestFields directive. An unauthenticated, remote attacker can exploit this, via specially crafted CONTINUATION frames in an HTTP/2 request, to inject unlimited request headers into the server, resulting in the exhaustion of memory resources. (CVE-2016-8740)
- A flaw exists due to improper handling of whitespace patterns in user-agent headers. An unauthenticated, remote attacker can exploit this, via a specially crafted user-agent header, to cause the program to incorrectly process sequences of requests, resulting in interpreting responses incorrectly, polluting the cache, or disclosing the content from one request to a second downstream user-agent. (CVE-2016-8743)
* Note: This check solely relied on the version number of the remote Web server to assess this vulnerability, so this might be a false positive.
* References:
https://httpd.apache.org/dev/dist/Announcement2.4.html
http://httpd.apache.org/security/vulnerabilities_24.html
https://github.com/apache/httpd/blob/2.4.x/CHANGES
https://www.apache.org/security/asf-httpoxy-response.txt
https://httpoxy.org
* Platforms Affected:
Apache HTTP versions 2.4.x prior to 2.4.25
Any operating system Any version |
| Recommendation |
Upgrade to the latest version of Apache HTTP Server (2.4.25 or later), available from the Apache Software Foundation download site, http://httpd.apache.org/download.cgi |
| Related URL |
CVE-2016-0736,CVE-2016-2161,CVE-2016-5387,CVE-2016-8740,CVE-2016-8743 (CVE) |
| Related URL |
91816,94650,95076,95077,95078 (SecurityFocus) |
| Related URL |
(ISS) |
|
