RHSA-2004:342 - Security Advisory

Topic

Updated httpd packages that fix a buffer overflow in mod_ssl and a remotely
triggerable memory leak are now available.

Description

The Apache HTTP server is a powerful, full-featured, efficient, and
freely-available Web server.

A stack buffer overflow was discovered in mod_ssl that could be triggered
if using the FakeBasicAuth option. If mod_ssl was sent a client certificate
with a subject DN field longer than 6000 characters, a stack overflow
occured if FakeBasicAuth had been enabled. In order to exploit this issue
the carefully crafted malicious certificate would have had to be signed by
a Certificate Authority which mod_ssl is configured to trust. The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name
CAN-2004-0488 to this issue.

A remotely triggered memory leak in the Apache HTTP Server earlier than
version 2.0.50 was also discovered. This allowed a remote attacker to
perform a denial of service attack against the server by forcing it to
consume large amounts of memory. The Common Vulnerabilities and Exposures
project (cve.mitre.org) has assigned the name CAN-2004-0493 to this issue.

Users of the Apache HTTP server should upgrade to these updated packages,
which contain backported patches that address these issues.

Solution

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

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade. Only those
RPMs which are currently installed will be updated. Those RPMs which are
not installed but included in the list will not be updated. Note that you
can also use wildcards (*.rpm) if your current directory *only* contains the
desired RPMs.

Please note that this update is also available via Red Hat Network. Many
people find this an easier way to apply updates. To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

Affected Products

• Red Hat Enterprise Linux Server 3 x86_64
• Red Hat Enterprise Linux Server 3 ia64
• Red Hat Enterprise Linux Server 3 i386
• Red Hat Enterprise Linux Workstation 3 x86_64
• Red Hat Enterprise Linux Workstation 3 ia64
• Red Hat Enterprise Linux Workstation 3 i386
• Red Hat Enterprise Linux Desktop 3 x86_64
• Red Hat Enterprise Linux Desktop 3 i386
• Red Hat Enterprise Linux for IBM z Systems 3 s390x
• Red Hat Enterprise Linux for IBM z Systems 3 s390
• Red Hat Enterprise Linux for Power, big endian 3 ppc

Fixes

• BZ - 125046 - CAN-2004-0488 mod_ssl ssl_util_uuencode_binary() stack overflow
• BZ - 126863 - CAN-2004-0493 folding header DoS

CVEs

• CVE-2004-0488
• CVE-2004-0493

References

• http://www.apacheweek.com/features/security-20