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Red Hat Enterprise Linux 5: RHSA-2009:1148-01 Critical DoS Update

red hat
Calendar Grey July 9, 2009
Dist Redhat Esm H88
Red Hat's important advisory details httpd update to fix critical DoS issues affecting Red Hat Enterprise Linux 5.
Updated httpd packages that fix two security issues are now available for Red Hat Enterprise Linux 5. This update has been rated as having important security impact by the Red Hat...

Solution

Before applying this update, make sure that all previously-released errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at

Summary

The Apache HTTP Server is a popular Web server.
A denial of service flaw was found in the Apache mod_proxy module when it was used as a reverse proxy. A remote attacker could use this flaw to force a proxy process to consume large amounts of CPU time. (CVE-2009-1890)
A denial of service flaw was found in the Apache mod_deflate module. This module continued to compress large files until compression was complete, even if the network connection that requested the content was closed before compression completed. This would cause mod_deflate to consume large amounts of CPU if mod_deflate was enabled for a large file. (CVE-2009-1891)
All httpd users should upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, the httpd daemon must be restarted for the update to take effect.

Topics%20covered

Topics Covered

security advisory denial of service update red hat httpd important

References

https://www.cve.org/CVERecord?id=CVE-2009-1890 https://www.cve.org/CVERecord?id=CVE-2009-1891 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux Desktop (v. 5 client):
Source:
i386: httpd-2.2.3-22.el5_3.2.i386.rpm httpd-debuginfo-2.2.3-22.el5_3.2.i386.rpm mod_ssl-2.2.3-22.el5_3.2.i386.rpm
x86_64: httpd-2.2.3-22.el5_3.2.x86_64.rpm httpd-debuginfo-2.2.3-22.el5_3.2.x86_64.rpm mod_ssl-2.2.3-22.el5_3.2.x86_64.rpm
RHEL Desktop Workstation (v. 5 client):
Source:
i386: httpd-debuginfo-2.2.3-22.el5_3.2.i386.rpm httpd-devel-2.2.3-22.el5_3.2.i386.rpm httpd-manual-2.2.3-22.el5_3.2.i386.rpm
x86_64: httpd-debuginfo-2.2.3-22.el5_3.2.i386.rpm httpd-debuginfo-2.2.3-22.el5_3.2.x86_64.rpm httpd-devel-2.2.3-22.el5_3.2.i386.rpm httpd-devel-2.2.3-22.el5_3.2.x86_64.rpm httpd-manual-2.2.3-22.el5_3.2.x86_64.rpm
Red Hat Enterprise Linux (v. 5 server):
Source:
i386: httpd-2.2.3-22.el5_3.2.i386.rpm httpd-debuginfo-2.2.3-22.el5_3.2.i386.rpm httpd-devel-2.2.3-22.el5_3.2.i386.rpm httpd-manual-2.2.3-22.el5_3.2.i386.rpm mod_ssl-2.2.3-22.el5_3.2.i386.rpm
ia64: httpd-2.2.3-22.el5_3.2.ia64.rpm httpd-debuginfo-2.2.3-22.el5_3.2.ia64.rpm httpd-devel-2.2.3-22.el5_3.2.ia64.rpm httpd-manual-2.2.3-22.el5_3.2.ia64.rpm mod_ssl-2.2.3-22.el5_3.2.ia64.rpm
ppc: httpd-2.2.3-22.el5_3.2.ppc.rpm httpd-debuginfo-2.2.3-22.el5_3.2.ppc.rpm httpd-debuginfo-2.2.3-22.el5_3.2.ppc64.rpm httpd-devel-2.2.3-22.el5_3.2.ppc.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2009:1148-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2009:1148.html
Issue date: 2009-07-09

Topic

Updated httpd packages that fix two security issues are now available forRed Hat Enterprise Linux 5.This update has been rated as having important security impact by the RedHat Security Response Team.

Topics%20covered

Topics Covered

security advisory denial of service update red hat httpd important

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

RHEL Desktop Workstation (v. 5 client) - i386, x86_64

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

Bugs Fixed

509125 - CVE-2009-1891 httpd: possible temporary DoS (CPU consumption) in mod_deflate

509375 - CVE-2009-1890 httpd: mod_proxy reverse proxy DoS (infinite loop)

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