Return-Path: Delivered-To: apmail-httpd-cvs-archive@httpd.apache.org Received: (qmail 65576 invoked by uid 500); 17 Jun 2002 18:25:11 -0000 Mailing-List: contact cvs-help@httpd.apache.org; run by ezmlm Precedence: bulk Reply-To: dev@httpd.apache.org list-help: list-unsubscribe: list-post: Delivered-To: mailing list cvs@httpd.apache.org Received: (qmail 65563 invoked by uid 500); 17 Jun 2002 18:25:11 -0000 Delivered-To: apmail-httpd-site-cvs@apache.org Date: 17 Jun 2002 18:25:10 -0000 Message-ID: <20020617182510.51002.qmail@icarus.apache.org> From: jwoolley@apache.org To: httpd-site-cvs@apache.org Subject: cvs commit: httpd-site/xdocs/info security_bulletin_20020617.txt X-Spam-Rating: daedalus.apache.org 1.6.2 0/1000/N jwoolley 2002/06/17 11:25:10 Modified: docs index.html docs/docs-project index.html xdocs index.xml Added: docs/info security_bulletin_20020617.txt xdocs/info security_bulletin_20020617.txt Log: Add security bulletin to site and update the xdocs transforms Revision Changes Path 1.26 +30 -0 httpd-site/docs/index.html Index: index.html =================================================================== RCS file: /home/cvs/httpd-site/docs/index.html,v retrieving revision 1.25 retrieving revision 1.26 diff -u -d -u -r1.25 -r1.26 --- index.html 23 May 2002 20:18:35 -0000 1.25 +++ index.html 17 Jun 2002 18:25:10 -0000 1.26 @@ -75,6 +75,36 @@ + +
+ SECURITY ADVISORY: June 17, 2002 + +
+
+

Versions of the Apache web server up to and including 1.3.24 and 2.0 up to +and including 2.0.36 contain a bug in the routines which deal with invalid +requests which are encoded using chunked encoding. This bug can be +triggered remotely by sending a carefully crafted invalid request. This +functionality is enabled by default.

+

In most cases the outcome of the invalid request is that the child process +dealing with the request will terminate. At the least, this could help a +remote attacker launch a denial of service attack as the parent process +will eventually have to replace the terminated child process and starting +new children uses non-trivial amounts of resources.

+

We were also notified today by ISS that they had published the same issue +which has forced the early release of this advisory. Please note that the +patch provided by ISS does not correct this vulnerability.

+

The Apache Software Foundation are currently working on new releases that +fix this issue, please stay tuned here at http://httpd.apache.org/ for +updated versions as they become available.

+

+Full Advisory +

+
+
+ + 1.17 +1 -1 httpd-site/docs/docs-project/index.html Index: index.html =================================================================== RCS file: /home/cvs/httpd-site/docs/docs-project/index.html,v retrieving revision 1.16 retrieving revision 1.17 diff -u -d -u -r1.16 -r1.17 --- index.html 29 May 2002 13:51:11 -0000 1.16 +++ index.html 17 Jun 2002 18:25:10 -0000 1.17 @@ -132,7 +132,7 @@

Some of the participants are:

  • Ryan Bloom
    • -
  • Rich Bowen
    • +
  • Rich Bowen
  • Ken Coar
  • Eric Cholet
  • Tony Finch
    • 1.1 httpd-site/docs/info/security_bulletin_20020617.txt Index: security_bulletin_20020617.txt =================================================================== Date: June 17, 2002 Product: Apache Web Server Versions: Apache 1.3 all versions including 1.3.24, Apache 2 all versions up to 2.0.36 Introduction: While testing for Oracle vulnerabilities, Mark Litchfield discovered a denial of service attack for Apache on Windows. Investigation by the Apache Software Foundation showed that this issue has a wider scope, which on some platforms results in a denial of service vulnerability, while on some other platforms presents a potential a remote exploit vulnerability. We were also notified today by ISS that they had published the same issue which has forced the early release of this advisory. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2002-0392 to this issue. Description: Versions of the Apache web server up to and including 1.3.24 and 2.0 up to and including 2.0.36 and 2.0.36-dev versions contain a bug in the routines which deal with invalid requests which are encoded using chunked encoding. This bug can be triggered remotely by sending a carefully crafted invalid request. This functionality is enabled by default. In most cases the outcome of the invalid request is that the child process dealing with the request will terminate. At the least, this could help a remote attacker launch a denial of service attack as the parent process will eventually have to replace the terminated child process and starting new children uses non-trivial amounts of resources. On the Windows and Netware platforms, Apache runs one multithreaded child process to service requests. The teardown and subsequent setup time to replace the lost child process presents a significant interruption of service. As the Windows and Netware ports create a new process and reread the configuration, rather than fork a child process, this delay is much more pronounced than on other platforms. In Apache 2.0 the error condition is correctly detected, so it will not allow an attacker to execure arbitrary code on the server. However platforms could be using a multithreaded model of multiple concurrent requests per child process (although the default preference remains multiple processes with a single thread and request per process, and most multithreaded models continue to create multiple child processes). Using any multithreaded model, all concurrent requests currently served by the affected child process will be lost. In Apache 1.3 the issue causes a stack overflow. Due to the nature of the overflow on 32-bit Unix platforms this will cause a segmentation violation and the child will terminate. However on 64-bit platforms the overflow can be controlled and so for platforms that store return addresses on the stack it is likely that it is further exploitable. This could allow arbitrary code to be run on the server as the user the Apache children are set to run as. We have been made aware that Apache 1.3 on Windows is exploitable in this way. Please note that the patch provided by ISS does not correct this vulnerability. The Apache Software Foundation are currently working on new releases that fix this issue, please see http://httpd.apache.org/ for updated versions. 1.15 +28 -0 httpd-site/xdocs/index.xml Index: index.xml =================================================================== RCS file: /home/cvs/httpd-site/xdocs/index.xml,v retrieving revision 1.14 retrieving revision 1.15 diff -u -d -u -r1.14 -r1.15 --- index.xml 6 May 2002 21:35:39 -0000 1.14 +++ index.xml 17 Jun 2002 18:25:10 -0000 1.15 @@ -25,6 +25,34 @@ +
    +SECURITY ADVISORY: June 17, 2002 + +

    Versions of the Apache web server up to and including 1.3.24 and 2.0 up to +and including 2.0.36 contain a bug in the routines which deal with invalid +requests which are encoded using chunked encoding. This bug can be +triggered remotely by sending a carefully crafted invalid request. This +functionality is enabled by default.

    + +

    In most cases the outcome of the invalid request is that the child process +dealing with the request will terminate. At the least, this could help a +remote attacker launch a denial of service attack as the parent process +will eventually have to replace the terminated child process and starting +new children uses non-trivial amounts of resources.

    + +

    We were also notified today by ISS that they had published the same issue +which has forced the early release of this advisory. Please note that the +patch provided by ISS does not correct this vulnerability.

    + +

    The Apache Software Foundation are currently working on new releases that +fix this issue, please stay tuned here at http://httpd.apache.org/ for +updated versions as they become available.

    + +

    +Full Advisory +

    +
    +
    Apache 2.0.36 Released 1.1 httpd-site/xdocs/info/security_bulletin_20020617.txt Index: security_bulletin_20020617.txt =================================================================== Date: June 17, 2002 Product: Apache Web Server Versions: Apache 1.3 all versions including 1.3.24, Apache 2 all versions up to 2.0.36 Introduction: While testing for Oracle vulnerabilities, Mark Litchfield discovered a denial of service attack for Apache on Windows. Investigation by the Apache Software Foundation showed that this issue has a wider scope, which on some platforms results in a denial of service vulnerability, while on some other platforms presents a potential a remote exploit vulnerability. We were also notified today by ISS that they had published the same issue which has forced the early release of this advisory. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2002-0392 to this issue. Description: Versions of the Apache web server up to and including 1.3.24 and 2.0 up to and including 2.0.36 and 2.0.36-dev versions contain a bug in the routines which deal with invalid requests which are encoded using chunked encoding. This bug can be triggered remotely by sending a carefully crafted invalid request. This functionality is enabled by default. In most cases the outcome of the invalid request is that the child process dealing with the request will terminate. At the least, this could help a remote attacker launch a denial of service attack as the parent process will eventually have to replace the terminated child process and starting new children uses non-trivial amounts of resources. On the Windows and Netware platforms, Apache runs one multithreaded child process to service requests. The teardown and subsequent setup time to replace the lost child process presents a significant interruption of service. As the Windows and Netware ports create a new process and reread the configuration, rather than fork a child process, this delay is much more pronounced than on other platforms. In Apache 2.0 the error condition is correctly detected, so it will not allow an attacker to execure arbitrary code on the server. However platforms could be using a multithreaded model of multiple concurrent requests per child process (although the default preference remains multiple processes with a single thread and request per process, and most multithreaded models continue to create multiple child processes). Using any multithreaded model, all concurrent requests currently served by the affected child process will be lost. In Apache 1.3 the issue causes a stack overflow. Due to the nature of the overflow on 32-bit Unix platforms this will cause a segmentation violation and the child will terminate. However on 64-bit platforms the overflow can be controlled and so for platforms that store return addresses on the stack it is likely that it is further exploitable. This could allow arbitrary code to be run on the server as the user the Apache children are set to run as. We have been made aware that Apache 1.3 on Windows is exploitable in this way. Please note that the patch provided by ISS does not correct this vulnerability. The Apache Software Foundation are currently working on new releases that fix this issue, please see http://httpd.apache.org/ for updated versions.
+ Apache 2.0.36 Released