Tenable SecurityCenter Apache 2.4.x < 2.4.25 Multiple Vulnerabilities (TNS-2017-04) (httpoxy)

High Nessus Plugin ID 101044


The Tenable SecurityCenter application on the remote host contains a web server that is affected by multiple vulnerabilities.


The Tenable SecurityCenter application installed on the remote host is missing a security patch. It is, therefore, affected by multiple vulnerabilities in the bundled version of Apache :

- 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 manipulated.

- 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 that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.


Upgrade to Tenable SecurityCenter version 5.4.3 or later.
Alternatively, contact the vendor for a patch.

See Also




Plugin Details

Severity: High

ID: 101044

File Name: securitycenter_apache_2_4_25.nasl

Version: $Revision: 1.3 $

Type: local

Family: Misc.

Published: 2017/06/26

Modified: 2018/02/14

Dependencies: 71158

Risk Information

Risk Factor: High


Base Score: 7.8

Temporal Score: 6.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Temporal Vector: CVSS2#E:F/RL:OF/RC:ND


Base Score: 7.5

Temporal Score: 6.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:X

Vulnerability Information

CPE: cpe:/a:tenable:securitycenter

Required KB Items: Host/SecurityCenter/Version, Host/SecurityCenter/support/httpd/version

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2017/02/09

Vulnerability Publication Date: 2016/07/18

Reference Information

CVE: CVE-2016-0736, CVE-2016-2161, CVE-2016-5387, CVE-2016-8740, CVE-2016-8743

BID: 91816, 94650, 95076, 95077, 95078

OSVDB: 141669, 148143, 148286, 148338, 149054

CERT: 797896

EDB-ID: 40961