Amazon Linux AMI : tomcat6 (ALAS-2017-810)

high Nessus Plugin ID 99037


The remote Amazon Linux AMI host is missing a security update.


It was discovered that the code that parsed the HTTP request line permitted

invalid characters. This could be exploited, in conjunction with a proxy that

also permitted the invalid characters but with a different interpretation, to

inject data into the HTTP response. By manipulating the HTTP response the

attacker could poison a web-cache, perform an XSS attack, or obtain sensitive

information from requests other then their own. (CVE-2016-6816)

Note: This fix causes Tomcat to respond with an HTTP 400 Bad Request error when

request contains characters that are not permitted by the HTTP specification to

appear not encoded, even though they were previously accepted. The newly

introduced system property tomcat.util.http.parser.HttpParser.requestTargetAllow

can be used to configure Tomcat to accept curly braces ({ and }) and the pipe

symbol (|) in not encoded form, as these are often used in URLs without being

properly encoded.

- A bug was discovered in the error handling of the send file code for the NIO

HTTP connector. This led to the current Processor object being added to the

Processor cache multiple times allowing information leakage between requests

including, and not limited to, session ID and the response body.


Run 'yum update tomcat6' to update your system.

See Also

Plugin Details

Severity: High

ID: 99037

File Name: ala_ALAS-2017-810.nasl

Version: 3.7

Type: local

Agent: unix

Published: 3/30/2017

Updated: 4/10/2019

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information


Risk Factor: Medium

Score: 4.9


Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

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


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:tomcat6, p-cpe:/a:amazon:linux:tomcat6-admin-webapps, p-cpe:/a:amazon:linux:tomcat6-docs-webapp, p-cpe:/a:amazon:linux:tomcat6-el-2.1-api, p-cpe:/a:amazon:linux:tomcat6-javadoc, p-cpe:/a:amazon:linux:tomcat6-jsp-2.1-api, p-cpe:/a:amazon:linux:tomcat6-lib, p-cpe:/a:amazon:linux:tomcat6-servlet-2.5-api, p-cpe:/a:amazon:linux:tomcat6-webapps, cpe:/o:amazon:linux

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/29/2017

Reference Information

CVE: CVE-2016-6816, CVE-2016-8745

ALAS: 2017-810

RHSA: 2017:0527