【CESA-2017:0906】最新バージョンのhttpdが、Red Hat Enterprise Linux 7 からご利用いただけるようになりました

CESA-2017:0906

最新バージョンのhttpdが、Red Hat Enterprise Linux 7 からご利用いただけるようになりました。

Red Hat製品のセキュリティ及び品質は大変ご好評いただいております。

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The httpd packages provide the Apache HTTP Server, a powerful, efficient, and
extensible web server.

Security Fix(es):

* It was discovered that the mod_session_crypto module of httpd did not use any
mechanisms to verify integrity of the encrypted session data stored in the
user’s browser. A remote attacker could use this flaw to decrypt and modify
session data using a padding oracle attack. (CVE-2016-0736)

* It was discovered that the mod_auth_digest module of httpd did not properly
check for memory allocation failures. A remote attacker could use this flaw to
cause httpd child processes to repeatedly crash if the server used HTTP digest
authentication. (CVE-2016-2161)

* It was discovered that the HTTP parser in httpd incorrectly allowed certain
characters not permitted by the HTTP protocol specification to appear unencoded
in HTTP request headers. If httpd was used in conjunction with a proxy or
backend server that interpreted those characters differently, a remote attacker
could possibly use this flaw to inject data into HTTP responses, resulting in
proxy cache poisoning. (CVE-2016-8743)

Note: The fix for the CVE-2016-8743 issue causes httpd to return “400 Bad
Request” error to HTTP clients which do not strictly follow HTTP protocol
specification. A newly introduced configuration directive “HttpProtocolOptions
Unsafe” can be used to re-enable the old less strict parsing. However, such
setting also re-introduces the CVE-2016-8743 issue.

Bug Fix(es):

* When waking up child processes during a graceful restart, the httpd parent
process could attempt to open more connections than necessary if a large number
of child processes had been active prior to the restart. Consequently, a
graceful restart could take a long time to complete. With this update, httpd has
been fixed to limit the number of connections opened during a graceful restart
to the number of active children, and the described problem no longer occurs.
(BZ#1420002)

* Previously, httpd running in a container returned the 500 HTTP status code
(Internal Server Error) when a connection to a WebSocket server was closed. As a
consequence, the httpd server failed to deliver the correct HTTP status and data
to a client. With this update, httpd correctly handles all proxied requests to
the WebSocket server, and the described problem no longer occurs. (BZ#1429947)

* In a configuration using LDAP authentication with the mod_authnz_ldap module,
the name set using the AuthLDAPBindDN directive was not correctly used to bind
to the LDAP server for all queries. Consequently, authorization attempts failed.
The LDAP modules have been fixed to ensure the configured name is correctly
bound for LDAP queries, and authorization using LDAP no longer fails.
(BZ#1420047)

Bugs Fixed

1406744 – CVE-2016-0736 httpd: Padding Oracle in Apache mod_session_crypto
1406753 – CVE-2016-2161 httpd: DoS vulnerability in mod_auth_digest
1406822 – CVE-2016-8743 httpd: Apache HTTP Request Parsing Whitespace Defects
1420002 – Backport fix for issue with graceful restart taking very long time sometimes
1420047 – AuthLDAPBindDN might not be used for some LDAP searches causing LDAP authz failures
1429947 – Backport: mod_proxy_wstunnel – AH02447: err/hup on backconn