Issued:
2009-11-11
Updated:
2009-11-11

RHSA-2009:1580 - Moderate: httpd security update

Synopsis

Moderate: httpd security update

Type/Severity

Security Advisory Moderate

Topic

Updated httpd packages that fix multiple security issues are now available for Red Hat Enterprise Linux 4.

This update has been rated as having moderate security impact by the Red Hat Security Response Team.

Description

The Apache HTTP Server is a popular Web server.

A flaw was found in the way the TLS/SSL (Transport Layer Security/Secure Sockets Layer) protocols handle session renegotiation. A man-in-the-middle attacker could use this flaw to prefix arbitrary plain text to a client's session (for example, an HTTPS connection to a website). This could force the server to process an attacker's request as if authenticated using the victim's credentials. This update partially mitigates this flaw for SSL sessions to HTTP servers using mod_ssl by rejecting client-requested renegotiation. (CVE-2009-3555)

Note: This update does not fully resolve the issue for HTTPS servers. An attack is still possible in configurations that require a server-initiated renegotiation. Refer to the following Knowledgebase article for further information: http://kbase.redhat.com/faq/docs/DOC-20491

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)

A NULL pointer dereference flaw was found in the Apache mod_proxy_ftp module. A malicious FTP server to which requests are being proxied could use this flaw to crash an httpd child process via a malformed reply to the EPSV or PASV commands, resulting in a limited denial of service. (CVE-2009-3094)

A second flaw was found in the Apache mod_proxy_ftp module. In a reverse proxy configuration, a remote attacker could use this flaw to bypass intended access restrictions by creating a carefully-crafted HTTP Authorization header, allowing the attacker to send arbitrary commands to the FTP server. (CVE-2009-3095)

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.

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 This content is not included.http://kbase.redhat.com/faq/docs/DOC-11259

Affected Products

ProductVersionArch
Red Hat Enterprise Linux for x86_64 - Extended Update Support4.8x86_64
Red Hat Enterprise Linux for x86_64 - Extended Update Support4.8ia64
Red Hat Enterprise Linux for x86_64 - Extended Update Support4.8i386
Red Hat Enterprise Linux for Power, big endian4ppc
Red Hat Enterprise Linux for Power, big endian - Extended Update Support4.8ppc
Red Hat Enterprise Linux for IBM z Systems4s390x
Red Hat Enterprise Linux for IBM z Systems4s390
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support4.8s390x
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support4.8s390
Red Hat Enterprise Linux Workstation4x86_64
Red Hat Enterprise Linux Workstation4ia64
Red Hat Enterprise Linux Workstation4i386
Red Hat Enterprise Linux Server4x86_64
Red Hat Enterprise Linux Server4ia64
Red Hat Enterprise Linux Server4i386
Red Hat Enterprise Linux Desktop4x86_64
Red Hat Enterprise Linux Desktop4i386

Updated Packages

  • mod_ssl-2.0.52-41.ent.6.x86_64.rpm
  • httpd-devel-2.0.52-41.ent.6.s390.rpm
  • httpd-suexec-2.0.52-41.ent.6.x86_64.rpm
  • httpd-devel-2.0.52-41.ent.6.s390x.rpm
  • httpd-devel-2.0.52-41.ent.6.ppc.rpm
  • httpd-manual-2.0.52-41.ent.6.x86_64.rpm
  • httpd-manual-2.0.52-41.ent.6.s390.rpm
  • httpd-suexec-2.0.52-41.ent.6.s390.rpm
  • httpd-2.0.52-41.ent.6.x86_64.rpm
  • httpd-devel-2.0.52-41.ent.6.i386.rpm
  • httpd-suexec-2.0.52-41.ent.6.s390x.rpm
  • httpd-2.0.52-41.ent.6.src.rpm
  • httpd-manual-2.0.52-41.ent.6.ia64.rpm
  • httpd-devel-2.0.52-41.ent.6.ia64.rpm
  • httpd-suexec-2.0.52-41.ent.6.ppc.rpm
  • mod_ssl-2.0.52-41.ent.6.ia64.rpm
  • httpd-manual-2.0.52-41.ent.6.s390x.rpm
  • mod_ssl-2.0.52-41.ent.6.ppc.rpm
  • httpd-manual-2.0.52-41.ent.6.i386.rpm
  • httpd-devel-2.0.52-41.ent.6.x86_64.rpm
  • httpd-suexec-2.0.52-41.ent.6.i386.rpm
  • httpd-manual-2.0.52-41.ent.6.ppc.rpm
  • httpd-2.0.52-41.ent.6.ppc.rpm
  • mod_ssl-2.0.52-41.ent.6.i386.rpm
  • httpd-2.0.52-41.ent.6.ia64.rpm
  • httpd-2.0.52-41.ent.6.s390.rpm
  • mod_ssl-2.0.52-41.ent.6.s390.rpm
  • httpd-2.0.52-41.ent.6.s390x.rpm
  • mod_ssl-2.0.52-41.ent.6.s390x.rpm
  • httpd-2.0.52-41.ent.6.i386.rpm
  • httpd-suexec-2.0.52-41.ent.6.ia64.rpm

Fixes

CVEs

References

Additional information