Detections
Analytics
Amazon Linux AMI : httpd (ALAS-2011-09)
medium Nessus Plugin ID 69568
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Synopsis
The remote Amazon Linux AMI host is missing a security update.Description
The MITRE CVE database describes these CVEs as :The mod_proxy module in the Apache HTTP Server 1.3.x through 1.3.42, 2.0.x through 2.0.64, and 2.2.x through 2.2.21 does not properly interact with use of (1) RewriteRule and (2) ProxyPassMatch pattern matches for configuration of a reverse proxy, which allows remote attackers to send requests to intranet servers via a malformed URI containing an initial @ (at sign) character.
The mod_proxy_ajp module in the Apache HTTP Server before 2.2.21, when used with mod_proxy_balancer in certain configurations, allows remote attackers to cause a denial of service (temporary 'error state' in the backend server) via a malformed HTTP request.
It was discovered that the Apache HTTP Server did not properly validate the request URI for proxied requests. In certain configurations, if a reverse proxy used the ProxyPassMatch directive, or if it used the RewriteRule directive with the proxy flag, a remote attacker could make the proxy connect to an arbitrary server, possibly disclosing sensitive information from internal web servers not directly accessible to the attacker.
It was discovered that mod_proxy_ajp incorrectly returned an 'Internal Server Error' response when processing certain malformed HTTP requests, which caused the back-end server to be marked as failed in configurations where mod_proxy was used in load balancer mode. A remote attacker could cause mod_proxy to not send requests to back-end AJP (Apache JServ Protocol) servers for the retry timeout period or until all back-end servers were marked as failed.
Solution
Run 'yum upgrade httpd' to upgrade your system. Then run 'service httpd restart' to restart the Apache HTTP Server.See Also
Plugin Details
Severity: Medium
ID: 69568
File Name: ala_ALAS-2011-09.nasl
Version: Revision: 1.8
Type: local
Agent: unix
Published: 9/4/2013
Updated: 1/30/2015
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:httpd-tools, p-cpe:/a:amazon:linux:mod_ssl, p-cpe:/a:amazon:linux:httpd-devel, p-cpe:/a:amazon:linux:httpd-debuginfo, cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:httpd, p-cpe:/a:amazon:linux:httpd-manual
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Patch Publication Date: 10/31/2011
Reference Information
CVE: CVE-2011-3348, CVE-2011-3368