RHSA-2008:0725 - Security Advisory

Topic

Updated rdesktop packages that fix a security issue and a bug 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

rdesktop is an open source client for Microsoft Windows NT Terminal Server
and Microsoft Windows 2000 and 2003 Terminal Services, capable of natively
using the Remote Desktop Protocol (RDP) to present the user's NT desktop.
No additional server extensions are required.

An integer underflow vulnerability was discovered in the rdesktop. If an
attacker could convince a victim to connect to a malicious RDP server, the
attacker could cause the victim's rdesktop to crash or, possibly, execute
an arbitrary code. (CVE-2008-1801)

Additionally, the following bug was fixed:

A missing command line option caused rdesktop to fail when using the krdc
remote desktop utility. Using krdc to connect to a terminal server resulted
in errors such as the following:

The version of rdesktop you are using ([version]) is too old:

rdesktop [version] or greater is required. A working patch for rdesktop
[version] can be found in KDE CVS.

In this updated package, krdc successfully connects to terminal servers.

Users of rdesktop should upgrade to these updated packages, which contain a
backported patches to resolve these issues.

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
http://kbase.redhat.com/faq/FAQ_58_10188

Affected Products

• Red Hat Enterprise Linux Server 4 x86_64
• Red Hat Enterprise Linux Server 4 ia64
• Red Hat Enterprise Linux Server 4 i386
• Red Hat Enterprise Linux Workstation 4 x86_64
• Red Hat Enterprise Linux Workstation 4 ia64
• Red Hat Enterprise Linux Workstation 4 i386
• Red Hat Enterprise Linux Desktop 4 x86_64
• Red Hat Enterprise Linux Desktop 4 i386
• Red Hat Enterprise Linux for IBM z Systems 4 s390x
• Red Hat Enterprise Linux for IBM z Systems 4 s390
• Red Hat Enterprise Linux for Power, big endian 4 ppc

Fixes

• BZ - 164462 - krdc requires rdesktop > 1.3.1
• BZ - 445825 - CVE-2008-1801 rdesktop: iso_recv_msg() Integer Underflow Vulnerability

CVEs

• CVE-2008-1801

References

• http://www.redhat.com/security/updates/classification/#moderate