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Category:   Application (Web Server/CGI)  >   Apache HTTPD Vendors:   Apache Software Foundation
(Red Hat Issues Fix) Apache mod_auth_digest Uninitialized Memory Error Lets Remote Users Obtain Potentially Sensitive Information and Deny Service
SecurityTracker Alert ID:  1039196
SecurityTracker URL:  http://securitytracker.com/id/1039196
CVE Reference:   CVE-2017-9788   (Links to External Site)
Date:  Aug 17 2017
Impact:   Denial of service via network, Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.2.33 and 2.4.26
Description:   A vulnerability was reported in Apache mod_auth_digest. A remote user can cause the target service to crash. A remote user can obtain potentially sensitive information on the target system.

The mod_auth_digest component does not properly initialize memory used to process 'Digest' type HTTP Authorization headers. A remote user can send a specially crafted request to view potentially sensitive information from the previous request.

Robert Swiecki reported this vulnerability.

Impact:   A remote user can cause the target service to crash.

A remote user can obtain potentially sensitive information on the target system.

Solution:   Red Hat has issued a fix for httpd24-httpd.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2017:2483

Vendor URL:  access.redhat.com/errata/RHSA-2017:2483 (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6, 6.7, 7, 7.3

Message History:   This archive entry is a follow-up to the message listed below.
Jul 13 2017 Apache mod_auth_digest Uninitialized Memory Error Lets Remote Users Obtain Potentially Sensitive Information and Deny Service



 Source Message Contents

Subject:  [RHSA-2017:2483-01] Important: httpd24-httpd security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: httpd24-httpd security update
Advisory ID:       RHSA-2017:2483-01
Product:           Red Hat Software Collections
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:2483
Issue date:        2017-08-16
CVE Names:         CVE-2017-3167 CVE-2017-3169 CVE-2017-7659 
                   CVE-2017-7668 CVE-2017-7679 CVE-2017-9788 
=====================================================================

1. Summary:

An update for httpd24-httpd is now available for Red Hat Software
Collections.

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.

2. Relevant releases/architectures:

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) - noarch, x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) - noarch, x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7) - noarch, x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.3) - noarch, x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) - noarch, x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64

3. Description:

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

Security Fix(es):

* It was discovered that the httpd's mod_auth_digest module did not
properly initialize memory before using it when processing certain headers
related to digest authentication. A remote attacker could possibly use this
flaw to disclose potentially sensitive information or cause httpd child
process to crash by sending specially crafted requests to a server.
(CVE-2017-9788)

* It was discovered that the use of httpd's ap_get_basic_auth_pw() API
function outside of the authentication phase could lead to authentication
bypass. A remote attacker could possibly use this flaw to bypass required
authentication if the API was used incorrectly by one of the modules used
by httpd. (CVE-2017-3167)

* A NULL pointer dereference flaw was found in the httpd's mod_ssl module.
A remote attacker could use this flaw to cause an httpd child process to
crash if another module used by httpd called a certain API function during
the processing of an HTTPS request. (CVE-2017-3169)

* A NULL pointer dereference flaw was found in the mod_http2 module of
httpd. A remote attacker could use this flaw to cause httpd child process
to crash via a specially crafted HTTP/2 request. (CVE-2017-7659)

* A buffer over-read flaw was found in the httpd's ap_find_token()
function. A remote attacker could use this flaw to cause httpd child
process to crash via a specially crafted HTTP request. (CVE-2017-7668)

* A buffer over-read flaw was found in the httpd's mod_mime module. A user
permitted to modify httpd's MIME configuration could use this flaw to cause
httpd child process to crash. (CVE-2017-7679)

4. 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.

5. Bugs fixed (https://bugzilla.redhat.com/):

1463194 - CVE-2017-3167 httpd: ap_get_basic_auth_pw() authentication bypass
1463197 - CVE-2017-3169 httpd: mod_ssl NULL pointer dereference
1463199 - CVE-2017-7659 httpd: mod_http2 NULL pointer dereference
1463205 - CVE-2017-7668 httpd: ap_find_token() buffer overread
1463207 - CVE-2017-7679 httpd: mod_mime buffer overread
1470748 - CVE-2017-9788 httpd: Uninitialized memory reflection in mod_auth_digest

6. Package List:

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6):

Source:
httpd24-httpd-2.4.25-9.el6.1.src.rpm

noarch:
httpd24-httpd-manual-2.4.25-9.el6.1.noarch.rpm

x86_64:
httpd24-httpd-2.4.25-9.el6.1.x86_64.rpm
httpd24-httpd-debuginfo-2.4.25-9.el6.1.x86_64.rpm
httpd24-httpd-devel-2.4.25-9.el6.1.x86_64.rpm
httpd24-httpd-tools-2.4.25-9.el6.1.x86_64.rpm
httpd24-mod_ldap-2.4.25-9.el6.1.x86_64.rpm
httpd24-mod_proxy_html-2.4.25-9.el6.1.x86_64.rpm
httpd24-mod_session-2.4.25-9.el6.1.x86_64.rpm
httpd24-mod_ssl-2.4.25-9.el6.1.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7):

Source:
httpd24-httpd-2.4.25-9.el6.1.src.rpm

noarch:
httpd24-httpd-manual-2.4.25-9.el6.1.noarch.rpm

x86_64:
httpd24-httpd-2.4.25-9.el6.1.x86_64.rpm
httpd24-httpd-debuginfo-2.4.25-9.el6.1.x86_64.rpm
httpd24-httpd-devel-2.4.25-9.el6.1.x86_64.rpm
httpd24-httpd-tools-2.4.25-9.el6.1.x86_64.rpm
httpd24-mod_ldap-2.4.25-9.el6.1.x86_64.rpm
httpd24-mod_proxy_html-2.4.25-9.el6.1.x86_64.rpm
httpd24-mod_session-2.4.25-9.el6.1.x86_64.rpm
httpd24-mod_ssl-2.4.25-9.el6.1.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6):

Source:
httpd24-httpd-2.4.25-9.el6.1.src.rpm

noarch:
httpd24-httpd-manual-2.4.25-9.el6.1.noarch.rpm

x86_64:
httpd24-httpd-2.4.25-9.el6.1.x86_64.rpm
httpd24-httpd-debuginfo-2.4.25-9.el6.1.x86_64.rpm
httpd24-httpd-devel-2.4.25-9.el6.1.x86_64.rpm
httpd24-httpd-tools-2.4.25-9.el6.1.x86_64.rpm
httpd24-mod_ldap-2.4.25-9.el6.1.x86_64.rpm
httpd24-mod_proxy_html-2.4.25-9.el6.1.x86_64.rpm
httpd24-mod_session-2.4.25-9.el6.1.x86_64.rpm
httpd24-mod_ssl-2.4.25-9.el6.1.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7):

Source:
httpd24-httpd-2.4.25-9.el7.1.src.rpm

noarch:
httpd24-httpd-manual-2.4.25-9.el7.1.noarch.rpm

x86_64:
httpd24-httpd-2.4.25-9.el7.1.x86_64.rpm
httpd24-httpd-debuginfo-2.4.25-9.el7.1.x86_64.rpm
httpd24-httpd-devel-2.4.25-9.el7.1.x86_64.rpm
httpd24-httpd-tools-2.4.25-9.el7.1.x86_64.rpm
httpd24-mod_ldap-2.4.25-9.el7.1.x86_64.rpm
httpd24-mod_proxy_html-2.4.25-9.el7.1.x86_64.rpm
httpd24-mod_session-2.4.25-9.el7.1.x86_64.rpm
httpd24-mod_ssl-2.4.25-9.el7.1.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.3):

Source:
httpd24-httpd-2.4.25-9.el7.1.src.rpm

noarch:
httpd24-httpd-manual-2.4.25-9.el7.1.noarch.rpm

x86_64:
httpd24-httpd-2.4.25-9.el7.1.x86_64.rpm
httpd24-httpd-debuginfo-2.4.25-9.el7.1.x86_64.rpm
httpd24-httpd-devel-2.4.25-9.el7.1.x86_64.rpm
httpd24-httpd-tools-2.4.25-9.el7.1.x86_64.rpm
httpd24-mod_ldap-2.4.25-9.el7.1.x86_64.rpm
httpd24-mod_proxy_html-2.4.25-9.el7.1.x86_64.rpm
httpd24-mod_session-2.4.25-9.el7.1.x86_64.rpm
httpd24-mod_ssl-2.4.25-9.el7.1.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7):

Source:
httpd24-httpd-2.4.25-9.el7.1.src.rpm

noarch:
httpd24-httpd-manual-2.4.25-9.el7.1.noarch.rpm

x86_64:
httpd24-httpd-2.4.25-9.el7.1.x86_64.rpm
httpd24-httpd-debuginfo-2.4.25-9.el7.1.x86_64.rpm
httpd24-httpd-devel-2.4.25-9.el7.1.x86_64.rpm
httpd24-httpd-tools-2.4.25-9.el7.1.x86_64.rpm
httpd24-mod_ldap-2.4.25-9.el7.1.x86_64.rpm
httpd24-mod_proxy_html-2.4.25-9.el7.1.x86_64.rpm
httpd24-mod_session-2.4.25-9.el7.1.x86_64.rpm
httpd24-mod_ssl-2.4.25-9.el7.1.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2017-3167
https://access.redhat.com/security/cve/CVE-2017-3169
https://access.redhat.com/security/cve/CVE-2017-7659
https://access.redhat.com/security/cve/CVE-2017-7668
https://access.redhat.com/security/cve/CVE-2017-7679
https://access.redhat.com/security/cve/CVE-2017-9788
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2017 Red Hat, Inc.
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