SB2016032903 - Amazon Linux AMI update for tomcat6
Published: March 29, 2016
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Limited directory traversal (CVE-ID: CVE-2015-5174)
The vulnerability allows a local attacker to obtain potentially sensitive information.
The vulnerability exists due to incorrect validation of paths in getResource(), getResourceAsStream() and getResourcePaths() methods within ServletContext. A local attacker can bypass security manager restrictions using directory traversal sequences and view directory listing outside the $CATALINA_BASE/webapps folder.
Successful exploitation of the vulnerability may allow a local attacker to obtain names of files and folder on vulnerable system.
2) Directory disclosure (CVE-ID: CVE-2015-5345)
The vulnerability allows a remote attacker to obtain potentially sensitive information.
When accessing a directory protected by a security constraint with a URL that did not end in a slash, Tomcat would redirect to the URL with the trailing slash thereby confirming the presence of the directory before processing the security constraint. It was therefore possible for a user to determine if a directory existed or not, even if the user was not permitted to view the directory.
Successful exploitation of the vulnerability may allow a remote attacker to confirm existence of directories on the system.
3) Privilege escalation (CVE-ID: CVE-2016-0714)
The vulnerability allows a local attacker to bypass security manager restriction.
A local attacker, who controls web application, can abuse functionality of StandardManager and PersistentManager to gain control over sessions persistence, stored in files, in database or in custom Sore. Since session persistence is performed by Tomcat code with the permissions assigned to Tomcat internal code, the attacker can place specially crafted object into a session and execute arbitrary code on vulnerable system with elevated privileges.
Successful exploitation of the vulnerability may allow a local attacker to gain elevated privileges on the system.
4) Security Manager bypass (CVE-ID: CVE-2016-0706)
The vulnerability allows a local attacker to obtain potentially sensitive information.
A local attacker, who controls web application, can use StatusManagerServlet, when a security manager was configured, to obtain potentially sensitive information, which belongs to other users. The attacker will be able to obtain a list of all deployed applications and a list of the HTTP request lines for all requests currently being processed. This could have exposed sensitive information from other web applications, such as session IDs, to the web application.
Successful exploitation of the vulnerability may allow a local attacker to gain access to potentially sensitive information.
Remediation
Install update from vendor's website.