Tenable SecurityCenter Apache 2.4.x < 2.4.25 Multiple Vulnerabilities (TNS-2017-04) (httpoxy)
high Nessus Plugin ID 101044
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New! Vulnerability Priority Rating (VPR)
Tenable calculates a dynamic VPR for every vulnerability. VPR combines vulnerability information with threat intelligence and machine learning algorithms to predict which vulnerabilities are most likely to be exploited in attacks. Read more about what VPR is and how it is different from CVSS.
VPR Score: 5.9
Synopsis
The Tenable SecurityCenter application on the remote host contains a web server that is affected by multiple vulnerabilities.Description
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.
(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 that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Upgrade to Tenable SecurityCenter version 5.4.3 or later.Alternatively, contact the vendor for a patch.
See Also
http://httpd.apache.org/security/vulnerabilities_24.html
https://www.tenable.com/security/tns-2017-04
https://static.tenable.com/prod_docs/upgrade_security_center.html
Plugin Details
Severity: High
ID: 101044
File Name: securitycenter_apache_2_4_25.nasl
Version: 1.8
Type: combined
Agent: unix
Family: Misc.
Published: 6/26/2017
Updated: 10/9/2020
Risk Information
Risk Factor: High
VPR Score: 5.9
CVSS Score Source: manual
CVSS Score Rationale: Score based on analysis of the vendor advisory.
CVSS v2.0
Base Score: 7.8
Temporal Score: 6.1
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C
Temporal Vector: CVSS2#E:POC/RL:OF/RC:C
CVSS v3.0
Base Score: 7.5
Temporal Score: 6.7
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:P/RL:O/RC:C
Vulnerability Information
CPE: cpe:2.3:a:tenable:securitycenter:*:*:*:*:*:*:*:*
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 2/9/2017
Vulnerability Publication Date: 7/18/2016
Reference Information
CVE: CVE-2016-8743, CVE-2016-5387, CVE-2016-2161, CVE-2016-8740, CVE-2016-0736