RHSA-2016:1636 - Security Advisory

Topic

Updated packages that provide Red Hat JBoss Web Server 3.0.3 Service Pack 1 and fixes two security issues and a bug with ajp processors are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

This release of Red Hat JBoss Web Server 3.0.3 Service Pack 1 serves as a update for Red Hat JBoss Web Server 3.0.3 httpd and tomcat.

Security Fix(es):

• It was discovered that httpd used the value of the Proxy header from HTTP requests to initialize the HTTP_PROXY environment variable for CGI scripts, which in turn was incorrectly used by certain HTTP client implementations to configure the proxy for outgoing HTTP requests. A remote attacker could possibly use this flaw to redirect HTTP requests performed by a CGI script to an attacker-controlled proxy via a malicious HTTP request. (CVE-2016-5387)
• It was discovered that tomcat used the value of the Proxy header from HTTP requests to initialize the HTTP_PROXY environment variable for CGI scripts, which in turn was incorrectly used by certain HTTP client implementations to configure the proxy for outgoing HTTP requests. A remote attacker could possibly use this flaw to redirect HTTP requests performed by a CGI script to an attacker-controlled proxy via a malicious HTTP request. (CVE-2016-5388)

Note: After this update, httpd will no longer pass the value of the Proxy request header to scripts via the HTTP_PROXY environment variable.

Red Hat would like to thank Scott Geary (VendHQ) for reporting these issues.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing the updated packages, the httpd daemon will be restarted automatically.

After installing the updated packages, follow the instructions in this knowledgebase article to configure Tomcat:

https://access.redhat.com/solutions/2435491

Affected Products

• JBoss Enterprise Web Server 3 for RHEL 6 x86_64
• JBoss Enterprise Web Server 3 for RHEL 6 i386

Fixes

• BZ - 1353755 - CVE-2016-5387 Apache HTTPD: sets environmental variable based on user supplied Proxy request header
• BZ - 1353809 - CVE-2016-5388 Tomcat: CGI sets environmental variable based on user supplied Proxy request header

CVEs

• CVE-2016-5387
• CVE-2016-5388

References

• http://www.redhat.com/security/updates/classification/#normal