RHSA-2008:0575 - Security Advisory

Topic

An updated rdesktop package that fixes a security issue is now available for
Red Hat Enterprise Linux 5.

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 and integer signedness issue were 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, CVE-2008-1803)

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 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.2 ia64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.2 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 5.2 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 5.2 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 445825 - CVE-2008-1801 rdesktop: iso_recv_msg() Integer Underflow Vulnerability
• BZ - 445829 - CVE-2008-1803 rdesktop: channel_process() Integer Signedness Vulnerability

CVEs

• CVE-2008-1801
• CVE-2008-1803

References

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